{"id":21256,"date":"2026-01-08T22:40:56","date_gmt":"2026-01-08T14:40:56","guid":{"rendered":"https:\/\/viox.com\/?p=21256"},"modified":"2026-01-08T22:45:13","modified_gmt":"2026-01-08T14:45:13","slug":"ats-circuit-breaker-coordination-guide-icw-selectivity","status":"publish","type":"post","link":"https:\/\/test.viox.com\/cs\/ats-circuit-breaker-coordination-guide-icw-selectivity\/","title":{"rendered":"Pr\u016fvodce koordinac\u00ed ATS a jisti\u010d\u016f: Vysv\u011btlen\u00ed Icw a selektivity"},"content":{"rendered":"<div class=\"product-intro\">\n<figure style=\"margin-bottom: 30px; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto;\" src=\"https:\/\/img.viox.com\/Industrial-automatic-transfer-switch-installation-showing-600A-ATS-with-visible-contacts-and-upstream-circuit-breakers-in-electrical-distribution-room.webp\" alt=\"Industrial 600A ATS installation with visible contacts and upstream circuit breakers in an electrical distribution room\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 10px; font-size: 0.9em;\">Obr\u00e1zek 1: Profesion\u00e1ln\u00ed instalace VIOX <a href=\"https:\/\/test.viox.com\/cs\/ats\/\">Automatick\u00fd p\u0159ep\u00edna\u010d<\/a> ilustruj\u00edc\u00ed kritick\u00fd fyzick\u00fd vztah mezi ATS a nad\u0159azen\u00fdmi ochrann\u00fdmi prvky v distribu\u010dn\u00edm prost\u0159ed\u00ed.<\/figcaption><\/figure>\n<h2>Pro\u010d v\u011bt\u0161ina specifikac\u00ed ATS postr\u00e1d\u00e1 kritick\u00fd koordina\u010dn\u00ed faktor<\/h2>\n<p>P\u0159i specifikaci automatick\u00e9ho p\u0159ep\u00edna\u010de (ATS) se v\u011bt\u0161ina elektroin\u017een\u00fdr\u016f zam\u011b\u0159uje na z\u0159ejm\u00e9 parametry: jmenovit\u00fd trval\u00fd proud, doba p\u0159epnut\u00ed a kompatibilita nap\u011bt\u00ed. Nicm\u00e9n\u011b v tis\u00edc\u00edch instalac\u00ed po cel\u00e9m sv\u011bt\u011b \u010d\u00edh\u00e1 kritick\u00fd nedostatek \u2013 koordina\u010dn\u00ed no\u010dn\u00ed m\u016fra mezi nad\u0159azen\u00fdmi jisti\u010di a schopnost\u00ed ATS odolat zkratu. Tato mezera se st\u00e1v\u00e1 katastrof\u00e1ln\u00ed b\u011bhem poruchov\u00fdch stav\u016f, kdy neshodn\u00e9 sch\u00e9ma ochrany bu\u010f zp\u016fsobuje ru\u0161iv\u00e9 vyp\u00edn\u00e1n\u00ed, kter\u00e9 odstav\u00ed cel\u00e1 za\u0159\u00edzen\u00ed, nebo v\u016fbec nechr\u00e1n\u00ed za\u0159\u00edzen\u00ed.<\/p>\n<p>Hlavn\u00ed probl\u00e9m spo\u010d\u00edv\u00e1 ve slo\u017eit\u00e9 interakci mezi <strong>kategoriemi selektivity jisti\u010d\u016f<\/strong>, <strong>jmenovit\u00fdmi hodnotami kr\u00e1tkodob\u00e9ho v\u00fddr\u017en\u00e9ho proudu (Icw)<\/strong>a <strong>toleranc\u00ed ATS v\u016f\u010di poruchov\u00e9mu proudu<\/strong>. Kdy\u017e in\u017een\u00fd\u0159i specifikuj\u00ed jisti\u010de kategorie B s \u00famysln\u00fdm \u010dasov\u00fdm zpo\u017ed\u011bn\u00edm pro dosa\u017een\u00ed selektivn\u00ed koordinace, vytv\u00e1\u0159ej\u00ed sc\u00e9n\u00e1\u0159, kdy ATS mus\u00ed p\u0159e\u017e\u00edt pln\u00fd poruchov\u00fd proud b\u011bhem tohoto zpo\u017ed\u011bn\u00ed \u2013 \u010dasto 100 milisekund a\u017e 1 sekundu. Standardn\u00ed jednotky ATS s jmenovitou hodnotou 3 cykl\u016f prost\u011b nemohou odolat t\u011bmto prodlou\u017een\u00fdm dob\u00e1m trv\u00e1n\u00ed poruchy, co\u017e vede ke sva\u0159ov\u00e1n\u00ed kontakt\u016f, po\u0161kozen\u00ed obloukem nebo \u00fapln\u00e9mu selh\u00e1n\u00ed p\u0159ep\u00edna\u010de.<\/p>\n<p>Tato komplexn\u00ed p\u0159\u00edru\u010dka poskytuje technick\u00fd vhled, kter\u00fd pot\u0159ebujete k zvl\u00e1dnut\u00ed koordinace ATS-jisti\u010d, pochopen\u00ed rozd\u00edlu mezi ochrann\u00fdmi za\u0159\u00edzen\u00edmi kategorie A a B, spr\u00e1vn\u00e9mu pou\u017eit\u00ed princip\u016f \u010dasov\u00e9 selektivity a specifikaci p\u0159ep\u00edna\u010d\u016f, kter\u00e9 odpov\u00eddaj\u00ed va\u0161\u00ed strategii nadproudov\u00e9 ochrany \u2013 a\u0165 u\u017e navrhujete syst\u00e9my nouzov\u00e9ho nap\u00e1jen\u00ed pro nemocnice, datov\u00e1 centra nebo kritick\u00e1 pr\u016fmyslov\u00e1 za\u0159\u00edzen\u00ed.<\/p>\n<h2>\u010c\u00e1st 1: Pochopen\u00ed kategori\u00ed jisti\u010d\u016f a jmenovit\u00fdch hodnot Icw<\/h2>\n<h3>1.1 Jisti\u010de kategorie A vs. kategorie B: Z\u00e1klad koordina\u010dn\u00ed strategie<\/h3>\n<p>Norma IEC 60947-2 rozd\u011bluje n\u00edzkonap\u011b\u0165ov\u00e9 jisti\u010de do dvou z\u00e1kladn\u00edch kategori\u00ed ochrany, kter\u00e9 ur\u010duj\u00ed jejich koordina\u010dn\u00ed chov\u00e1n\u00ed. <strong>Jisti\u010de kategorie A<\/strong> pracuj\u00ed s okam\u017eit\u00fdmi magnetick\u00fdmi spou\u0161t\u011bc\u00edmi funkcemi a neposkytuj\u00ed \u017e\u00e1dn\u00e9 \u00famysln\u00e9 kr\u00e1tkodob\u00e9 zpo\u017ed\u011bn\u00ed. Tato za\u0159\u00edzen\u00ed \u2013 typicky lisovan\u00e9 jisti\u010de (MCCB) a miniaturn\u00ed jisti\u010de (MCB) \u2013 jsou navr\u017eena tak, aby vypnula co nejrychleji, kdy\u017e je detekov\u00e1n poruchov\u00fd proud, obvykle do 10\u201320 milisekund. Jisti\u010de kategorie A nemaj\u00ed jmenovitou hodnotu Icw, proto\u017ee jsou navr\u017eeny k p\u0159eru\u0161en\u00ed, nikoli k odol\u00e1v\u00e1n\u00ed zkratov\u00fdm proud\u016fm.<\/p>\n<p>Jisti\u010de kategorie A nasad\u00edte v obvodech motorov\u00fdch nap\u00e1je\u010d\u016f, koncov\u00fdch rozvodn\u00fdch panelech a ochran\u011b odbo\u010dek, kde je c\u00edlem okam\u017eit\u00e9 odstran\u011bn\u00ed poruchy. Rychle p\u016fsob\u00edc\u00ed charakteristika chr\u00e1n\u00ed kabely a navazuj\u00edc\u00ed za\u0159\u00edzen\u00ed p\u0159ed tepeln\u00fdm a mechanick\u00fdm nam\u00e1h\u00e1n\u00edm, ale nenab\u00edz\u00ed \u017e\u00e1dnou flexibilitu koordinace. Kdy\u017e dojde k poru\u0161e kdekoli v chr\u00e1n\u011bn\u00e9 z\u00f3n\u011b, jisti\u010d kategorie A vypne \u2013 te\u010dka.<\/p>\n<figure style=\"margin: 30px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto;\" src=\"https:\/\/img.viox.com\/Technical-comparison-of-Category-A-vs-Category-B-circuit-breakers-showing-internal-components-trip-characteristics-and-Icw-ratings-for-selective-coordination.webp\" alt=\"Technical comparison of Category A vs Category B circuit breakers showing internal components, trip characteristics, and Icw ratings\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 10px; font-size: 0.9em;\">Obr\u00e1zek 2: Podrobn\u00e9 technick\u00e9 srovn\u00e1n\u00ed ukazuj\u00edc\u00ed vnit\u0159n\u00ed rozd\u00edly mezi jisti\u010di kategorie A (okam\u017eit\u00e9) a kategorie B (zpo\u017ed\u011bn\u00e9). V\u0161imn\u011bte si zes\u00edlen\u00fdch kontakt\u016f a zpo\u017e\u010fovac\u00edch mechanism\u016f v za\u0159\u00edzen\u00edch kategorie B, kter\u00e9 jsou vy\u017eadov\u00e1ny pro selektivn\u00ed koordinaci.<\/figcaption><\/figure>\n<p><strong>Jisti\u010de kategorie B<\/strong>, naopak obsahuj\u00ed nastaviteln\u00e9 kr\u00e1tkodob\u00e9 zpo\u017e\u010fovac\u00ed funkce, kter\u00e9 umo\u017e\u0148uj\u00ed sofistikovan\u00e9 \u010dasov\u011b zalo\u017een\u00e9 koordina\u010dn\u00ed strategie. Tato za\u0159\u00edzen\u00ed \u2013 p\u0159ev\u00e1\u017en\u011b vzduchov\u00e9 jisti\u010de (ACB) a n\u011bkter\u00e9 vysoce v\u00fdkonn\u00e9 <a href=\"https:\/\/test.viox.com\/cs\/mccb\/\">MCCB<\/a>\u2013 lze naprogramovat tak, aby \u00famysln\u011b zpozdila svou reakci na vypnut\u00ed mezi 0,05 a 1,0 sekundami, kdy\u017e je detekov\u00e1n poruchov\u00fd proud. Toto zpo\u017ed\u011bn\u00ed umo\u017e\u0148uje navazuj\u00edc\u00edm ochrann\u00fdm za\u0159\u00edzen\u00edm nejprve odstranit poruchy, \u010d\u00edm\u017e se dos\u00e1hne skute\u010dn\u00e9 selektivn\u00ed koordinace. Jisti\u010de kategorie B mus\u00ed m\u00edt jmenovitou hodnotu Icw, kter\u00e1 potvrzuje jejich schopnost odolat poruchov\u00e9mu proudu b\u011bhem doby zpo\u017ed\u011bn\u00ed bez utrp\u011bn\u00ed po\u0161kozen\u00ed.<\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Funkce<\/th>\n<th>Jisti\u010de kategorie A<\/th>\n<th>Jisti\u010de kategorie B<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Charakteristika vypnut\u00ed<\/strong><\/td>\n<td>Okam\u017eit\u00e9 (10-20 ms)<\/td>\n<td>Nastaviteln\u00e9 zpo\u017ed\u011bn\u00ed (0,05-1,0 s)<\/td>\n<\/tr>\n<tr>\n<td><strong>Jmenovit\u00e1 zkratov\u00e1 v\u00fddr\u017e Icw<\/strong><\/td>\n<td>Nen\u00ed uvedeno<\/td>\n<td>Povinn\u00e9 hodnocen\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>Typick\u00e9 typy<\/strong><\/td>\n<td>MCB, standardn\u00ed MCCB<\/td>\n<td>ACB, pokro\u010dil\u00fd MCCB<\/td>\n<\/tr>\n<tr>\n<td><strong>Prim\u00e1rn\u00ed pou\u017eit\u00ed<\/strong><\/td>\n<td>Nap\u00e1jec\u00ed\/odbo\u010dkov\u00e9 obvody<\/td>\n<td>Hlavn\u00ed p\u0159\u00edvody, propojen\u00ed sb\u011brnic<\/td>\n<\/tr>\n<tr>\n<td><strong>Metoda koordinace<\/strong><\/td>\n<td>Pouze velikost proudu<\/td>\n<td>\u010casov\u011b zpo\u017ed\u011bn\u00e1 selektivita<\/td>\n<\/tr>\n<tr>\n<td><strong>Relativn\u00ed n\u00e1klady<\/strong><\/td>\n<td>Spodn\u00ed<\/td>\n<td>Vy\u0161\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>Slo\u017eitost aplikace<\/strong><\/td>\n<td>Jednoduch\u00fd<\/td>\n<td>Vy\u017eaduje koordina\u010dn\u00ed studii<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Pochopen\u00ed tohoto z\u00e1kladn\u00edho rozd\u00edlu je z\u00e1sadn\u00ed, kdy\u017e <a href=\"https:\/\/test.viox.com\/cs\/circuit-breaker-ratings-icu-ics-icw-icm\/\">vyb\u00edr\u00e1te ochranu obvodu pro instalace ATS<\/a>, proto\u017ee kategorie jisti\u010de p\u0159\u00edmo ur\u010duje po\u017eadavky na jmenovit\u00e9 hodnoty ATS a slo\u017eitost koordinace.<\/p>\n<h3>1.2 Co je Icw (kr\u00e1tkodob\u00fd v\u00fddr\u017en\u00fd proud)?<\/h3>\n<p><strong>Jmenovit\u00fd kr\u00e1tkodob\u00fd v\u00fddr\u017en\u00fd proud (Icw)<\/strong> p\u0159edstavuje maxim\u00e1ln\u00ed RMS symetrick\u00fd zkratov\u00fd proud, kter\u00fd m\u016f\u017ee jisti\u010d kategorie B v\u00e9st po stanovenou dobu bez vypnut\u00ed nebo utrp\u011bn\u00ed tepeln\u00e9ho nebo elektrodynamick\u00e9ho po\u0161kozen\u00ed. IEC 60947-2 definuje standardn\u00ed doby trv\u00e1n\u00ed testu 0,05, 0,1, 0,25, 0,5 a 1,0 sekundy, p\u0159i\u010dem\u017e jisti\u010d z\u016fst\u00e1v\u00e1 b\u011bhem poruchy uzav\u0159en\u00fd a sleduje se degradace kontaktu, selh\u00e1n\u00ed izolace nebo mechanick\u00e1 deformace.<\/p>\n<figure style=\"margin: 30px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto;\" src=\"https:\/\/img.viox.com\/Detailed-view-of-circuit-breaker-contact-assembly-showing-arc-quenching-and-thermal-distribution-during-short-time-withstand-Icw-operation---VIOX-Electric.webp\" alt=\"Close-up of circuit breaker contact assembly showing arc quenching and thermal distribution\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 10px; font-size: 0.9em;\">Obr\u00e1zek 3: Detailn\u00ed pohled na sestavu kontakt\u016f a komory pro zh\u00e1\u0161en\u00ed oblouku. Tyto komponenty mus\u00ed odolat extr\u00e9mn\u00edmu tepeln\u00e9mu (I<sup>2<\/sup>t) a elektrodynamick\u00e9mu nam\u00e1h\u00e1n\u00ed b\u011bhem kr\u00e1tkodob\u00e9 v\u00fddr\u017ee (Icw).<\/figcaption><\/figure>\n<p>Fyzick\u00e9 nam\u00e1h\u00e1n\u00ed b\u011bhem tohoto obdob\u00ed v\u00fddr\u017ee je extr\u00e9mn\u00ed. Tepeln\u011b generuje poruchov\u00fd proud I<sup>2<\/sup>t energii, kter\u00e1 oh\u0159\u00edv\u00e1 vodi\u010de, kontakty a p\u0159\u00edpojnice podle druh\u00e9 mocniny proudu vyn\u00e1soben\u00e9 \u010dasem. Porucha 50 kA trvaj\u00edc\u00ed 0,5 sekundy produkuje 1 250 MJ\/s tepeln\u00e9 energie, kter\u00e1 mus\u00ed b\u00fdt absorbov\u00e1na bez p\u0159ekro\u010den\u00ed teplotn\u00edch limit\u016f materi\u00e1lu. Elektrodynamicky vytv\u00e1\u0159ej\u00ed magnetick\u00e1 pole generovan\u00e1 poruchov\u00fdmi proudy odpudiv\u00e9 s\u00edly mezi paraleln\u00edmi vodi\u010di, kter\u00e9 mohou p\u0159ekro\u010dit n\u011bkolik tun na metr \u2013 s\u00edly, kter\u00e9 nesm\u00ed oh\u00fdbat p\u0159\u00edpojnice nebo po\u0161kodit sestavy kontakt\u016f.<\/p>\n<p><strong>Pro\u010d je Icw kritick\u00e9 pro koordinaci ATS<\/strong>: Kdy\u017e nakonfigurujete nad\u0159azen\u00fd jisti\u010d kategorie B s 0,2sekundov\u00fdm kr\u00e1tkodob\u00fdm zpo\u017ed\u011bn\u00edm pro dosa\u017een\u00ed selektivity s navazuj\u00edc\u00edmi nap\u00e1je\u010di, ka\u017ed\u00e9 za\u0159\u00edzen\u00ed v s\u00e9rii \u2013 v\u010detn\u011b ATS \u2013 mus\u00ed odolat poruchov\u00e9mu proudu po celou dobu tohoto zpo\u017ed\u011bn\u00ed. Jisti\u010d s jmenovitou hodnotou Icw = 42 kA po dobu 0,5 s m\u016f\u017ee p\u0159e\u017e\u00edt 42 000 amp\u00e9r po dobu p\u016fl sekundy, ale pokud v\u00e1\u0161 ATS postr\u00e1d\u00e1 ekvivalentn\u00ed kr\u00e1tkodobou v\u00fddr\u017e, stane se slab\u00fdm \u010dl\u00e1nkem, kter\u00fd sel\u017ee v r\u00e1mci koordina\u010dn\u00edch sch\u00e9mat navr\u017een\u00fdch pro zv\u00fd\u0161en\u00ed spolehlivosti syst\u00e9mu.<\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Typ jisti\u010de<\/th>\n<th>Typick\u00fd rozsah Icw<\/th>\n<th>B\u011b\u017en\u00e9 \u010dasov\u00e9 hodnoty<\/th>\n<th>P\u0159\u00edklad aplikace<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Odoln\u00fd MCCB<\/strong><\/td>\n<td>12-50 kA<\/td>\n<td>0,05 s, 0,1 s, 0,25 s<\/td>\n<td>Hlavn\u00ed rozvad\u011b\u010d<\/td>\n<\/tr>\n<tr>\n<td><strong>Vzduchov\u00fd jisti\u010d (ACB)<\/strong><\/td>\n<td>30-100 kA<\/td>\n<td>0,1 s, 0,25 s, 0,5 s, 1,0 s<\/td>\n<td>Vstupn\u00ed servis, propojen\u00ed sb\u011brnic<\/td>\n<\/tr>\n<tr>\n<td><strong>Kompaktn\u00ed ACB<\/strong><\/td>\n<td>50-85 kA<\/td>\n<td>0,25 s, 0,5 s, 1,0 s<\/td>\n<td>Hlavn\u00ed gener\u00e1tor, vstup UPS<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Profesion\u00e1ln\u00ed tip<\/strong>: Hodnota Icw na datov\u00e9m listu jisti\u010de obvykle p\u0159edpokl\u00e1d\u00e1 maxim\u00e1ln\u00ed dobu zpo\u017ed\u011bn\u00ed (\u010dasto 1,0 s). Pokud va\u0161e koordina\u010dn\u00ed studie vy\u017eaduje krat\u0161\u00ed zpo\u017ed\u011bn\u00ed (nap\u0159. 0,1 s), m\u016f\u017eete b\u00fdt schopni pou\u017e\u00edt jisti\u010d s ni\u017e\u0161\u00ed jmenovitou hodnotou Icw, proto\u017ee tepeln\u00e9 nam\u00e1h\u00e1n\u00ed I<sup>2<\/sup>t p\u0159i 0,1 s je v\u00fdrazn\u011b men\u0161\u00ed ne\u017e p\u0159i 1,0 s. V\u017edy ov\u011b\u0159te, \u017ee I<sup>2<\/sup>t(porucha) &lt; I<sup>2<\/sup>cw \u00d7 t(zpo\u017ed\u011bn\u00ed).<\/p>\n<h3>1.3 Souvisej\u00edc\u00ed jmenovit\u00e9 hodnoty: Icu, Ics a Icm<\/h3>\n<p>V\u00fdkon jisti\u010de p\u0159i zkratu zahrnuje \u010dty\u0159i vz\u00e1jemn\u011b souvisej\u00edc\u00ed jmenovit\u00e9 hodnoty, kter\u00e9 je t\u0159eba ch\u00e1pat jako koordinovan\u00fd syst\u00e9m, nikoli jako izolovan\u00e9 specifikace.<\/p>\n<p><strong>Icu (Mezn\u00ed zkratov\u00e1 vyp\u00ednac\u00ed schopnost)<\/strong> definuje maxim\u00e1ln\u00ed efektivn\u00ed hodnotu symetrick\u00e9ho zkratov\u00e9ho proudu, kter\u00fd m\u016f\u017ee jisti\u010d bezpe\u010dn\u011b p\u0159eru\u0161it za testovac\u00edch podm\u00ednek specifikovan\u00fdch v IEC 60947-2. Po vypnut\u00ed p\u0159i Icu m\u016f\u017ee b\u00fdt jisti\u010d po\u0161kozen a nevhodn\u00fd pro dal\u0161\u00ed provoz, ale nesm\u00ed vytv\u00e1\u0159et bezpe\u010dnostn\u00ed riziko. P\u0159edstavte si Icu jako pr\u00e1h p\u0159e\u017eit\u00ed \u2013 jisti\u010d to p\u0159e\u017eil, ale jen tak tak. U kritick\u00fdch instalac\u00ed chcete, aby dostupn\u00fd zkratov\u00fd proud z\u016fstal hluboko pod Icu za v\u0161ech provozn\u00edch sc\u00e9n\u00e1\u0159\u016f.<\/p>\n<p><strong>Ics (Provozn\u00ed zkratov\u00e1 vyp\u00ednac\u00ed schopnost)<\/strong> p\u0159edstavuje \u00farove\u0148 zkratov\u00e9ho proudu, p\u0159i kter\u00e9 m\u016f\u017ee jisti\u010d p\u0159eru\u0161it proud a pot\u00e9 pokra\u010dovat v norm\u00e1ln\u00edm provozu s plnou funk\u010dnost\u00ed. Norma IEC definuje Ics jako procento Icu \u2013 obvykle 25 %, 50 %, 75 % nebo 100 % v z\u00e1vislosti na konstrukci jisti\u010de a zam\u00fd\u0161len\u00e9m pou\u017eit\u00ed. Pro <a href=\"https:\/\/test.viox.com\/cs\/ats-troubleshooting-guide\/\">syst\u00e9my p\u0159ep\u00edna\u010d\u016f pro kritick\u00e9 aplikace<\/a> v nemocnic\u00edch, datov\u00fdch centrech nebo nouzov\u00fdch nap\u00e1jec\u00edch instalac\u00edch zaji\u0161\u0165uje specifikace jisti\u010d\u016f s Ics = 100 % Icu, \u017ee ani maxim\u00e1ln\u00ed jmenovit\u00e9 zkratov\u00e9 ud\u00e1losti nezhor\u0161\u00ed integritu ochrann\u00e9ho syst\u00e9mu.<\/p>\n<p><strong>Icm (Jmenovit\u00fd zap\u00ednac\u00ed proud)<\/strong> specifikuje maxim\u00e1ln\u00ed \u0161pi\u010dkov\u00fd okam\u017eit\u00fd proud, kter\u00fd m\u016f\u017ee jisti\u010d bezpe\u010dn\u011b zapnout p\u0159i jmenovit\u00e9m nap\u011bt\u00ed. Tato jmenovit\u00e1 hodnota je kritick\u00e1 b\u011bhem operac\u00ed p\u0159ep\u00edn\u00e1n\u00ed ATS a sekvenc\u00ed synchronizace gener\u00e1toru, kdy m\u016f\u017eete p\u0159ep\u00ednat do st\u00e1vaj\u00edc\u00edho zkratov\u00e9ho stavu. Vztah mezi Icm a Icu z\u00e1vis\u00ed na \u00fa\u010din\u00edku zkratov\u00e9 smy\u010dky: Icm = k \u00d7 Icu, kde k se pohybuje od 1,5 (vysok\u00e1 impedance, odporov\u00e9 zkraty) do 2,2 (n\u00edzk\u00e1 impedance, induktivn\u00ed zkraty typick\u00e9 v nap\u00e1jec\u00edch syst\u00e9mech). U jisti\u010de s jmenovitou hodnotou Icu = 50 kA p\u0159i cos \u03c6 = 0,3 o\u010dek\u00e1vejte Icm \u2248 110 kA \u0161pi\u010dkov\u011b.<\/p>\n<p><strong>B\u011b\u017en\u00e1 chyba<\/strong>: In\u017een\u00fd\u0159i \u010dasto ov\u011b\u0159uj\u00ed, \u017ee Icu jisti\u010de na vstupu p\u0159ekra\u010duje dostupn\u00fd zkratov\u00fd proud, ale nezkontroluj\u00ed dostate\u010dnost Icw, kdy\u017e jsou pou\u017eita \u010dasov\u00e1 zpo\u017ed\u011bn\u00ed. Pro <a href=\"https:\/\/test.viox.com\/cs\/wiring-automatic-transfer-switch-hybrid-inverter\/\">sch\u00e9mata koordinace gener\u00e1tor-ATS-s\u00ed\u0165<\/a>, m\u016f\u017ee b\u00fdt toto opomenut\u00ed katastrof\u00e1ln\u00ed \u2013 jisti\u010d p\u0159e\u017eije zkrat (spl\u0148uje Icu), ale kontakty ATS se sva\u0159ily b\u011bhem 0,3sekundov\u00e9ho zpo\u017ed\u011bn\u00ed, proto\u017ee nikdo neov\u011b\u0159il jmenovit\u00e9 hodnoty pro kr\u00e1tkodob\u00e9 v\u00fddr\u017en\u00e9 proudy.<\/p>\n<h2>\u010c\u00e1st 2: Principy selektivity a strategie koordinace<\/h2>\n<h3>2.1 Co je selektivita (diskriminace)?<\/h3>\n<p><strong>Selektivita<\/strong>, tak\u00e9 naz\u00fdvan\u00e1 diskriminace nebo koordinace, popisuje strategick\u00e9 uspo\u0159\u00e1d\u00e1n\u00ed nadproudov\u00fdch ochrann\u00fdch za\u0159\u00edzen\u00ed v distribu\u010dn\u00edm syst\u00e9mu tak, \u017ee funguje pouze ochrann\u00e9 za\u0159\u00edzen\u00ed bezprost\u0159edn\u011b p\u0159ed zkratem, zat\u00edmco v\u0161echna ostatn\u00ed za\u0159\u00edzen\u00ed na vstupu z\u016fst\u00e1vaj\u00ed sepnut\u00e1. In\u017een\u00fdrsk\u00fdm c\u00edlem je minimalizovat rozsah p\u0159eru\u0161en\u00ed nap\u00e1jen\u00ed \u2013 izolovat nejmen\u0161\u00ed mo\u017enou \u010d\u00e1st instalace zasa\u017eenou zkratem a z\u00e1rove\u0148 zachovat kontinuitu nap\u00e1jen\u00ed pro v\u0161echny ostatn\u00ed z\u00e1t\u011b\u017ee.<\/p>\n<p>Uva\u017eujme distribu\u010dn\u00ed syst\u00e9m nap\u00e1jej\u00edc\u00ed dvacet v\u00fdrobn\u00edch bun\u011bk prost\u0159ednictv\u00edm jednotliv\u00fdch jisti\u010d\u016f nap\u00e1je\u010d\u016f, v\u0161echny nap\u00e1jen\u00e9 ze spole\u010dn\u00e9ho hlavn\u00edho jisti\u010de. Bez selektivity by zemn\u00ed spoj v bu\u0148ce \u010d. 1 mohl vypnout hlavn\u00ed jisti\u010d, co\u017e by zp\u016fsobilo v\u00fdpadek v\u0161ech dvaceti bun\u011bk a zastaven\u00ed v\u00fdroby v cel\u00e9m za\u0159\u00edzen\u00ed. P\u0159i spr\u00e1vn\u00e9 selektivit\u011b se otev\u0159e pouze jisti\u010d nap\u00e1je\u010de bu\u0148ky \u010d. 1, \u010d\u00edm\u017e se v\u00fdpadek omez\u00ed na jednu bu\u0148ku, zat\u00edmco ostatn\u00edch devaten\u00e1ct pokra\u010duje v provozu.<\/p>\n<p>Dva z\u00e1kladn\u00ed mechanismy umo\u017e\u0148uj\u00ed selektivitu: <strong>proudov\u00e1 selektivita<\/strong> (tak\u00e9 naz\u00fdvan\u00e1 amp\u00e9rov\u00e1 selektivita nebo diskriminace podle velikosti) a <strong>\u010dasov\u00e1 selektivita<\/strong> (diskriminace pomoc\u00ed z\u00e1m\u011brn\u00e9ho zpo\u017ed\u011bn\u00ed). V\u011bt\u0161ina koordinovan\u00fdch ochrann\u00fdch sch\u00e9mat vyu\u017e\u00edv\u00e1 oba mechanismy v r\u016fzn\u00fdch rozsaz\u00edch zkratov\u00fdch proud\u016f, \u010d\u00edm\u017e dosahuje \u010d\u00e1ste\u010dn\u00e9 selektivity p\u0159i vysok\u00fdch \u00farovn\u00edch zkratov\u00e9ho proudu a \u00fapln\u00e9 selektivity p\u0159i ni\u017e\u0161\u00edch proudech, kde impedance syst\u00e9mu p\u0159irozen\u011b rozli\u0161uje velikosti zkrat\u016f v r\u016fzn\u00fdch m\u00edstech.<\/p>\n<h3>2.2 Proudov\u00e1 selektivita: P\u0159irozen\u00e1 koordinace podle velikosti<\/h3>\n<p>Proudov\u00e1 selektivita vyu\u017e\u00edv\u00e1 p\u0159irozenou impedanci kabel\u016f a transform\u00e1tor\u016f k vytvo\u0159en\u00ed rozd\u00edl\u016f v magnitud\u011b zkratov\u00e9ho proudu mezi \u00farovn\u011bmi distribuce. Zkrat na konci 50metrov\u00e9ho nap\u00e1jec\u00edho kabelu odeb\u00edr\u00e1 podstatn\u011b men\u0161\u00ed proud ne\u017e zkrat na za\u010d\u00e1tku nap\u00e1je\u010de kv\u016fli impedanci kabelu. Nastaven\u00edm prahov\u00e9 hodnoty okam\u017eit\u00e9ho vypnut\u00ed jisti\u010de na vstupu nad maxim\u00e1ln\u00ed zkratov\u00fd proud, kter\u00fd uvid\u00ed jisti\u010d na v\u00fdstupu, dos\u00e1hnete selektivity automaticky \u2013 za\u0159\u00edzen\u00ed na v\u00fdstupu vypne p\u0159i ni\u017e\u0161\u00edch proudech, za\u0159\u00edzen\u00ed na vstupu reaguje pouze na zkraty ve sv\u00e9 chr\u00e1n\u011bn\u00e9 z\u00f3n\u011b.<\/p>\n<p><strong>P\u0159\u00edklad<\/strong>: Hlavn\u00ed jisti\u010d 400 A nap\u00e1j\u00ed jisti\u010d nap\u00e1je\u010de 100 A p\u0159es 75 metr\u016f m\u011bd\u011bn\u00e9ho kabelu 50 mm\u00b2. Zkratov\u00fd proud v m\u00edst\u011b hlavn\u00edho jisti\u010de m\u016f\u017ee dos\u00e1hnout 35 kA, ale impedance kabelu omezuje maxim\u00e1ln\u00ed zkratov\u00fd proud na svork\u00e1ch z\u00e1t\u011b\u017ee jisti\u010de nap\u00e1je\u010de na p\u0159ibli\u017en\u011b 12 kA. Nastaven\u00ed okam\u017eit\u00e9ho vypnut\u00ed hlavn\u00edho jisti\u010de na 25 kA a magnetick\u00e9ho vypnut\u00ed nap\u00e1je\u010de na 15 kA vytvo\u0159\u00ed selektivn\u00ed okno \u2013 jak\u00fdkoli zkrat odeb\u00edraj\u00edc\u00ed m\u00e9n\u011b ne\u017e 25 kA je odstran\u011bn pouze jisti\u010dem nap\u00e1je\u010de.<\/p>\n<p>Omezen\u00edm proudov\u00e9 selektivity je <strong>mez selektivity<\/strong>\u2013 \u00farove\u0148 zkratov\u00e9ho proudu, kde se prot\u00ednaj\u00ed \u010dasov\u011b-proudov\u00e9 charakteristiky za\u0159\u00edzen\u00ed na vstupu a na v\u00fdstupu. Pod t\u00edmto proudem funguje pouze za\u0159\u00edzen\u00ed na v\u00fdstupu. Nad n\u00edm mohou ob\u011b za\u0159\u00edzen\u00ed vypnout sou\u010dasn\u011b (ztr\u00e1ta selektivity). U typick\u00e9 dvojice MCCB se meze selektivity pohybuj\u00ed od 3 do 15 kA v z\u00e1vislosti na jmenovit\u00fdch hodnot\u00e1ch jisti\u010d\u016f a tabulk\u00e1ch selektivity poskytovan\u00fdch v\u00fdrobcem.<\/p>\n<p><strong>\u010c\u00e1ste\u010dn\u00e1 selektivita<\/strong> existuje, kdy\u017e je koordinace zachov\u00e1na a\u017e do meze selektivity, ale ztracena p\u0159i vy\u0161\u0161\u00edch zkratov\u00fdch proudech. <strong>\u00dapln\u00e1 selektivita<\/strong> znamen\u00e1, \u017ee koordinace se vztahuje na plnou vyp\u00ednac\u00ed schopnost za\u0159\u00edzen\u00ed na v\u00fdstupu. Pro instalace, kde <a href=\"https:\/\/test.viox.com\/cs\/ats-troubleshooting-generator-wont-transfer\/\">ochrana proti zkratu automatick\u00e9ho p\u0159ep\u00edna\u010de<\/a> mus\u00ed zaru\u010dit stabilitu jisti\u010de na vstupu b\u011bhem zkrat\u016f na v\u00fdstupu, je \u00fapln\u00e1 selektivita \u010dasto vy\u017eadov\u00e1na specifikac\u00ed nebo po\u017eadavky norem.<\/p>\n<h3>2.3 \u010casov\u00e1 selektivita s Icw: In\u017een\u00fdrsk\u00e9 z\u00e1m\u011brn\u00e9 zpo\u017ed\u011bn\u00ed<\/h3>\n<p>\u010casov\u00e1 selektivita zav\u00e1d\u00ed z\u00e1m\u011brn\u00e1 zpo\u017ed\u011bn\u00ed v ochrann\u00fdch za\u0159\u00edzen\u00edch na vstupu, aby se vytvo\u0159ilo koordina\u010dn\u00ed okno, b\u011bhem kter\u00e9ho mohou za\u0159\u00edzen\u00ed na v\u00fdstupu nejprve odstranit zkraty. Tento p\u0159\u00edstup je nezbytn\u00fd, kdy\u017e samotn\u00e1 proudov\u00e1 selektivita nem\u016f\u017ee dos\u00e1hnout \u00fapln\u00e9 koordinace, zejm\u00e9na p\u0159i vysok\u00fdch \u00farovn\u00edch zkratov\u00e9ho proudu v bl\u00edzkosti zdroje nap\u00e1jen\u00ed, kde je rozd\u00edl impedance mezi \u00farovn\u011bmi minim\u00e1ln\u00ed.<\/p>\n<figure style=\"margin: 30px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto;\" src=\"https:\/\/img.viox.com\/Technical-diagram-showing-ATS-circuit-breaker-selective-coordination-with-time-delays-Icw-ratings-and-fault-current-paths-in-emergency-power-distribution.webp\" alt=\"Technical diagram showing ATS circuit breaker selective coordination with time delays and Icw ratings\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 10px; font-size: 0.9em;\">Obr\u00e1zek 4: Koordina\u010dn\u00ed diagram ilustruj\u00edc\u00ed kritick\u00e1 \u010dasov\u00e1 zpo\u017ed\u011bn\u00ed. Hlavn\u00ed p\u0159\u00edvod ze s\u00edt\u011b (zpo\u017ed\u011bn\u00ed 0,4 s) a jisti\u010d gener\u00e1toru (zpo\u017ed\u011bn\u00ed 0,2 s) jsou koordinov\u00e1ny s nap\u00e1je\u010di na v\u00fdstupu (okam\u017eit\u00e9), co\u017e vy\u017eaduje, aby ATS m\u011bl dostate\u010dn\u00e9 Icw, aby vydr\u017eel zkratov\u00fd proud b\u011bhem t\u011bchto obdob\u00ed zpo\u017ed\u011bn\u00ed.<\/figcaption><\/figure>\n<p>Princip je jednoduch\u00fd: nakonfigurujte jisti\u010d kategorie B na vstupu s kr\u00e1tkodob\u00fdm zpo\u017ed\u011bn\u00edm (obvykle 0,1 s, 0,2 s nebo 0,4 s), pot\u00e9 nastavte jisti\u010de na v\u00fdstupu s postupn\u011b krat\u0161\u00edmi zpo\u017ed\u011bn\u00edmi nebo okam\u017eit\u00fdm vypnut\u00edm. Kdy\u017e dojde ke zkratu, jisti\u010d na v\u00fdstupu nejbl\u00ed\u017ee zkratu funguje b\u011bhem 10\u201330 ms, zat\u00edmco jisti\u010d na vstupu z\u00e1m\u011brn\u011b z\u016fst\u00e1v\u00e1 sepnut\u00fd po dobu sv\u00e9ho p\u0159ednastaven\u00e9ho zpo\u017ed\u011bn\u00ed. Pokud jisti\u010d na v\u00fdstupu \u00fasp\u011b\u0161n\u011b odstran\u00ed zkrat, za\u0159\u00edzen\u00ed na vstupu nikdy nevypne. Pokud za\u0159\u00edzen\u00ed na v\u00fdstupu sel\u017ee nebo zkrat p\u0159ekro\u010d\u00ed jeho vyp\u00ednac\u00ed schopnost, jisti\u010d na vstupu funguje po sv\u00e9m zpo\u017ed\u011bn\u00ed a poskytuje z\u00e1lo\u017en\u00ed ochranu.<\/p>\n<p><strong>Kritick\u00fd po\u017eadavek<\/strong>: Jisti\u010d kategorie B na vstupu mus\u00ed m\u00edt dostate\u010dnou jmenovitou hodnotu Icw, aby vydr\u017eel zkratov\u00fd proud po celou dobu zpo\u017ed\u011bn\u00ed. Rozhoduj\u00edc\u00ed rovnice je:<\/p>\n<p><strong>I<sup>2<\/sup>t(porucha) &lt; I<sup>2<\/sup>cw \u00d7 t(zpo\u017ed\u011bn\u00ed)<\/strong><\/p>\n<p>Kde I<sup>2<\/sup>t(zkrat) p\u0159edstavuje tepelnou energii ze zkratu (proud na druhou \u00d7 \u010das) a I<sup>2<\/sup>cw \u00d7 t(zpo\u017ed\u011bn\u00ed) p\u0159edstavuje schopnost jisti\u010de odolat.<\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>\u00darove\u0148 koordinace<\/th>\n<th>Typ za\u0159\u00edzen\u00ed<\/th>\n<th>Nastaven\u00ed zpo\u017ed\u011bn\u00ed vypnut\u00ed<\/th>\n<th>Po\u017eadovan\u00e9 Icw p\u0159i zkratu 30 kA<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u00darove\u0148 3 \u2013 Hlavn\u00ed p\u0159\u00edvod<\/strong><\/td>\n<td>ACB 1600A<\/td>\n<td>zpo\u017ed\u011bn\u00ed 0,4 s<\/td>\n<td>42 kA po dobu 0,5 s<\/td>\n<\/tr>\n<tr>\n<td><strong>\u00darove\u0148 2 \u2013 Podrozvod<\/strong><\/td>\n<td>MCCB 400A<\/td>\n<td>zpo\u017ed\u011bn\u00ed 0,2 s<\/td>\n<td>35 kA po dobu 0,25 s<\/td>\n<\/tr>\n<tr>\n<td><strong>\u00darove\u0148 1 \u2013 Nap\u00e1je\u010d<\/strong><\/td>\n<td>MCCB 100A<\/td>\n<td>Okam\u017eit\u00e9<\/td>\n<td>Nelze pou\u017e\u00edt (kategorie A)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>V t\u00e9to kask\u00e1d\u011b je zkrat 30 kA na \u00farovni 1 odstran\u011bn jisti\u010dem nap\u00e1je\u010de 100 A za 20 ms. Jisti\u010d 400 A \u010dek\u00e1 0,2 s (mus\u00ed vydr\u017eet 30 kA po dobu alespo\u0148 0,25 s podle sv\u00e9 jmenovit\u00e9 hodnoty Icw), vid\u00ed, \u017ee zkrat byl odstran\u011bn, a z\u016fst\u00e1v\u00e1 sepnut\u00fd. Hlavn\u00ed jisti\u010d 1600 A \u010dek\u00e1 0,4 s (mus\u00ed vydr\u017eet 30 kA po dobu alespo\u0148 0,5 s), tak\u00e9 z\u016fst\u00e1v\u00e1 sepnut\u00fd. V\u00fdsledek: pouze nap\u00e1je\u010d se zkratem ztrat\u00ed nap\u00e1jen\u00ed.<\/p>\n<p><strong>B\u011b\u017en\u00e1 chyba<\/strong>: In\u017een\u00fd\u0159i n\u011bkdy deaktivuj\u00ed okam\u017eit\u00e9 vypnut\u00ed na hlavn\u00edm jisti\u010di, aby \u201czlep\u0161ili koordinaci\u201d, ani\u017e by ov\u011b\u0159ili, \u017ee v\u0161echna s\u00e9riov\u011b zapojen\u00e1 za\u0159\u00edzen\u00ed \u2013 v\u010detn\u011b ATS \u2013 vydr\u017e\u00ed prodlou\u017een\u00e9 trv\u00e1n\u00ed zkratu. T\u00edm se vytvo\u0159\u00ed mezera v ochran\u011b, kde dojde k po\u0161kozen\u00ed za\u0159\u00edzen\u00ed d\u0159\u00edve, ne\u017e se aktivuje zpo\u017ed\u011bn\u00e9 vypnut\u00ed.<\/p>\n<h3>2.4 Selektivita v kritick\u00fdch syst\u00e9mech: Po\u017eadavky NEC a po\u017eadavky na ochranu \u017eivota<\/h3>\n<p>N\u00e1rodn\u00ed elektrotechnick\u00fd p\u0159edpis (NEC) \u010dl\u00e1nek 700.28 na\u0159izuje selektivn\u00ed koordinaci pro nadproudov\u00e1 za\u0159\u00edzen\u00ed nouzov\u00e9ho syst\u00e9mu a vy\u017eaduje \u201ckoordinaci dosa\u017eenou v\u00fdb\u011brem a instalac\u00ed nadproudov\u00fdch ochrann\u00fdch za\u0159\u00edzen\u00ed a jejich jmenovit\u00fdch hodnot nebo nastaven\u00ed pro cel\u00fd rozsah dostupn\u00fdch nadproud\u016f od p\u0159et\u00ed\u017een\u00ed po maxim\u00e1ln\u00ed dostupn\u00fd zkratov\u00fd proud.\u201d Podobn\u00e9 po\u017eadavky existuj\u00ed v \u010dl\u00e1nku 517 NEC pro zdravotnick\u00e1 za\u0159\u00edzen\u00ed a v \u010dl\u00e1nku 708 pro nap\u00e1jec\u00ed syst\u00e9my kritick\u00fdch provoz\u016f.<\/p>\n<p>Tyto po\u017eadavky norem z\u00e1sadn\u011b ovliv\u0148uj\u00ed strategie specifikace ATS. Pro dosa\u017een\u00ed selektivn\u00ed koordinace v souladu s normami v nouzov\u00e9 distribuci energie mus\u00ed in\u017een\u00fd\u0159i \u010dasto deaktivovat nebo v\u00fdrazn\u011b zpozdit funkci okam\u017eit\u00e9ho vypnut\u00ed na jisti\u010d\u00edch na vstupu, kter\u00e9 nap\u00e1jej\u00ed ATS. Hlavn\u00ed jisti\u010d, kter\u00fd by za norm\u00e1ln\u00edch okolnost\u00ed vypnul za 1\u20132 cykly (16\u201332 ms) b\u011bhem zkratu 40 kA, m\u016f\u017ee b\u00fdt nastaven na zpo\u017ed\u011bn\u00ed 0,3 sekundy, aby se koordinoval s nouzov\u00fdmi nap\u00e1je\u010di na v\u00fdstupu.<\/p>\n<p>T\u00edm se vytv\u00e1\u0159\u00ed koordina\u010dn\u00ed paradox: samotn\u00e1 zpo\u017ed\u011bn\u00ed vy\u017eadovan\u00e1 pro selektivitu v souladu s normami vystavuj\u00ed ATS prodlou\u017een\u00e9mu zkratu, kter\u00fd standardn\u00ed jmenovit\u00e9 hodnoty v\u00fddr\u017ee 3 cykl\u016f nemohou p\u0159e\u017e\u00edt. <a href=\"https:\/\/test.viox.com\/cs\/circuit-breaker-ratings-icu-ics-icw-icm\/\">Pochopen\u00ed jmenovit\u00fdch hodnot p\u0159ep\u00edna\u010de p\u0159i zkratu<\/a> se st\u00e1v\u00e1 povinn\u00fdm, nikoli voliteln\u00fdm, p\u0159i n\u00e1vrhu nouzov\u00e9ho syst\u00e9mu. Mus\u00edte bu\u010f specifikovat ATS jednotky s kr\u00e1tkodobou jmenovitou odolnost\u00ed, kter\u00e9 jsou schopny p\u0159e\u017e\u00edt koordina\u010dn\u00ed zpo\u017ed\u011bn\u00ed, nebo p\u0159epracovat sch\u00e9ma ochrany pomoc\u00ed proudov\u011b omezuj\u00edc\u00edch za\u0159\u00edzen\u00ed (pojistek), kter\u00e9 poskytuj\u00ed inherentn\u00ed selektivitu bez \u010dasov\u00fdch zpo\u017ed\u011bn\u00ed.<\/p>\n<p><strong>Profesion\u00e1ln\u00ed tip<\/strong>: P\u0159ed finalizac\u00ed nastaven\u00ed jisti\u010d\u016f pro nouzov\u00e9 syst\u00e9my prove\u010fte kompletn\u00ed koordina\u010dn\u00ed studii, kter\u00e1 zahrnuje jmenovitou odolnost ATS proti zkratu jako omezen\u00ed. Mnoho in\u017een\u00fdr\u016f p\u0159\u00edli\u0161 pozd\u011b zjist\u00ed, \u017ee dosa\u017een\u00ed shody s NEC 700.28 s jejich zvolen\u00fdm nastaven\u00edm jisti\u010d\u016f vy\u017eaduje upgrade na dra\u017e\u0161\u00ed p\u0159ep\u00edna\u010d s kr\u00e1tkodobou jmenovitou odolnost\u00ed \u2013 zm\u011bna objedn\u00e1vky, kter\u00e9 se dalo p\u0159edej\u00edt spr\u00e1vnou anal\u00fdzou koordinace v ran\u00e9 f\u00e1zi.<\/p>\n<h2>\u010c\u00e1st 3: Jmenovit\u00e9 hodnoty zkratu ATS a po\u017eadavky na koordinaci<\/h2>\n<h3>3.1 Odolnost ATS a sp\u00ednac\u00ed schopnost (WCR): Pochopen\u00ed z\u00e1klad\u016f<\/h3>\n<p>Ka\u017ed\u00fd automatick\u00fd p\u0159ep\u00edna\u010d m\u00e1 <strong>odolnost a sp\u00ednac\u00ed schopnost (WCR)<\/strong> kter\u00e1 definuje maxim\u00e1ln\u00ed potenci\u00e1ln\u00ed zkratov\u00fd proud, kter\u00e9mu m\u016f\u017ee p\u0159ep\u00edna\u010d bezpe\u010dn\u011b odolat, je-li chr\u00e1n\u011bn specifikovan\u00fdm nadproudov\u00fdm ochrann\u00fdm za\u0159\u00edzen\u00edm (OCPD). Tato hodnota nen\u00ed samostatn\u00e1 schopnost za\u0159\u00edzen\u00ed \u2013 p\u0159edstavuje testovanou a certifikovanou kombinaci ATS se specifick\u00fdmi typy a nastaven\u00edmi ochrany proti nadproudu.<\/p>\n<p>Standardn\u00ed jmenovit\u00e9 hodnoty ATS jsou obvykle zalo\u017eeny na <strong>3cyklov\u00e9m testov\u00e1n\u00ed odolnosti<\/strong> (p\u0159ibli\u017en\u011b 50 milisekund p\u0159i 60 Hz), b\u011bhem kter\u00e9ho mus\u00ed p\u0159ep\u00edna\u010d odolat poruchov\u00e9mu proudu, zat\u00edmco se nadproudov\u00e9 ochrann\u00e9 za\u0159\u00edzen\u00ed otev\u0159e, ani\u017e by do\u0161lo ke sva\u0159en\u00ed kontakt\u016f, selh\u00e1n\u00ed izolace nebo mechanick\u00e9mu po\u0161kozen\u00ed. Testov\u00e1n\u00ed se \u0159\u00edd\u00ed protokoly UL 1008 (Standard pro za\u0159\u00edzen\u00ed p\u0159ep\u00edna\u010d\u016f), kter\u00e9 za\u0159\u00edzen\u00ed vystavuj\u00ed nejhor\u0161\u00edm sc\u00e9n\u00e1\u0159\u016fm poruch, v\u010detn\u011b sepnut\u00ed do st\u00e1vaj\u00edc\u00edch poruch a poruch, ke kter\u00fdm dojde, kdy\u017e jsou kontakty sepnut\u00e9.<\/p>\n<p>Technick\u00e9 \u00fadaje v\u00fdrobce ATS obvykle uv\u00e1d\u011bj\u00ed WCR ve dvou form\u00e1tech:<\/p>\n<p><strong>\u201cJmenovit\u00e9 hodnoty \u201dspecifick\u00e9ho jisti\u010de\u201c<\/strong> certifikuj\u00ed ATS pro pou\u017eit\u00ed s explicitn\u011b identifikovan\u00fdmi modely jisti\u010d\u016f, jmenovit\u00fdmi hodnotami a nastaven\u00edm vyp\u00ednac\u00edch charakteristik. Nap\u0159\u00edklad: \u201c100 kA SCCR p\u0159i ochran\u011b jisti\u010dem Square D Model HDA36100, r\u00e1m 100 A, magnetick\u00e1 spou\u0161\u0165 nastaven\u00e1 na 10\u00d7In, s povolenou okam\u017eitou spou\u0161t\u00ed.\u201d To poskytuje maxim\u00e1ln\u00ed jmenovitou hodnotu, ale omezuje flexibilitu n\u00e1vrhu.<\/p>\n<p><strong>\u201cJmenovit\u00e9 hodnoty \u201djak\u00e9hokoli jisti\u010de\u201c<\/strong> certifikuj\u00ed ATS pro pou\u017eit\u00ed s jak\u00fdmkoli jisti\u010dem spl\u0148uj\u00edc\u00edm specifikovan\u00e9 charakteristiky \u2013 obvykle vy\u017eaduj\u00edc\u00ed okam\u017eitou vyp\u00ednac\u00ed schopnost a 3cyklov\u00e9 vypnut\u00ed. Nap\u0159\u00edklad: \u201c42 kA SCCR p\u0159i ochran\u011b jak\u00fdmkoli jisti\u010dem se jmenovit\u00fdm proudem \u2265100 A s okam\u017eit\u00fdm vyp\u00edn\u00e1n\u00edm a maxim\u00e1ln\u00ed dobou vypnut\u00ed 3 cykly.\u201d To nab\u00edz\u00ed flexibilitu n\u00e1vrhu, ale \u010dasto se sn\u00ed\u017een\u00fdmi jmenovit\u00fdmi hodnotami poruchov\u00e9ho proudu.<\/p>\n<p>B\u011b\u017en\u00e9 hodnoty WCR pro komer\u010dn\u00ed a lehk\u00e9 pr\u016fmyslov\u00e9 jednotky ATS se pohybuj\u00ed od 10 kA do 100 kA, s typick\u00fdmi jmenovit\u00fdmi hodnotami 22 kA, 42 kA, 65 kA a 85 kA v z\u00e1vislosti na velikosti r\u00e1mu a konstrukci:<\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Velikost r\u00e1mu ATS<\/th>\n<th>Typick\u00fd rozsah 3cyklov\u00e9ho WCR<\/th>\n<th>B\u011b\u017en\u00fd po\u017eadavek na OCPD<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>30\u2013100 A<\/strong><\/td>\n<td>10-35 kA<\/td>\n<td>Jak\u00fdkoli jisti\u010d, okam\u017eit\u00e9 vypnut\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>150-400A<\/strong><\/td>\n<td>22-65 kA<\/td>\n<td>Specifick\u00fd jisti\u010d nebo proudov\u011b omezuj\u00edc\u00ed pojistka<\/td>\n<\/tr>\n<tr>\n<td><strong>600\u20131200 A<\/strong><\/td>\n<td>42-100 kA<\/td>\n<td>Specifick\u00fd jisti\u010d s dokumentovan\u00fdm nastaven\u00edm<\/td>\n<\/tr>\n<tr>\n<td><strong>1600-3000A<\/strong><\/td>\n<td>65-200 kA<\/td>\n<td>Navr\u017een\u00e1 koordinace, \u010dasto ji\u0161t\u011bn\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Profesion\u00e1ln\u00ed tip<\/strong>: Term\u00edn \u201cjak\u00fdkoli jisti\u010d\u201d je pon\u011bkud zav\u00e1d\u011bj\u00edc\u00ed \u2013 ve skute\u010dnosti znamen\u00e1 \u201cjak\u00fdkoli jisti\u010d s okam\u017eit\u00fdm vypnut\u00edm, kter\u00fd vypne za 3 cykly nebo m\u00e9n\u011b.\u201d To vylu\u010duje jisti\u010de kategorie B konfigurovan\u00e9 s kr\u00e1tkodob\u00fdmi zpo\u017ed\u011bn\u00edmi, co\u017e je omezen\u00ed, kter\u00e9 mnoho in\u017een\u00fdr\u016f p\u0159ekvap\u00ed, kdy\u017e se pokou\u0161ej\u00ed dos\u00e1hnout selektivn\u00ed koordinace.<\/p>\n<h3>3.2 ATS s kr\u00e1tkodobou jmenovitou odolnost\u00ed: In\u017een\u00fdrsk\u00e1 \u0159e\u0161en\u00ed pro \u010dasov\u011b zpo\u017ed\u011bnou koordinaci<\/h3>\n<p>Pro umo\u017en\u011bn\u00ed koordinace s jisti\u010di kategorie B vyu\u017e\u00edvaj\u00edc\u00edmi z\u00e1m\u011brn\u00e1 \u010dasov\u00e1 zpo\u017ed\u011bn\u00ed nab\u00edzej\u00ed v\u00fdrobci ATS <strong>p\u0159ep\u00edna\u010de s kr\u00e1tkodobou jmenovitou odolnost\u00ed<\/strong> testovan\u00e9 tak, aby vydr\u017eely specifikovan\u00e9 poruchov\u00e9 proudy po prodlou\u017eenou dobu a\u017e 30 cykl\u016f (0,5 sekundy). Tyto specializovan\u00e9 jednotky proch\u00e1zej\u00ed p\u0159\u00edsn\u00fdm testov\u00e1n\u00edm podle ustanoven\u00ed UL 1008, kter\u00e9 ov\u011b\u0159uj\u00ed integritu kontakt\u016f, schopnost p\u0159eru\u0161en\u00ed oblouku a struktur\u00e1ln\u00ed stabilitu b\u011bhem trval\u00fdch poruchov\u00fdch podm\u00ednek, kter\u00e9 by zni\u010dily standardn\u00ed p\u0159ep\u00edna\u010de.<\/p>\n<p>Typick\u00e9 kr\u00e1tkodob\u00e9 jmenovit\u00e9 hodnoty se \u0159\u00edd\u00ed \u010dasov\u011b-proudov\u00fdm vztahem, kde jsou vy\u0161\u0161\u00ed proudy tolerov\u00e1ny po krat\u0161\u00ed dobu:<\/p>\n<ul>\n<li>30 kA po dobu 0,3 sekundy (18 cykl\u016f)<\/li>\n<li>42 kA po dobu 0,2 sekundy (12 cykl\u016f)<\/li>\n<li>50 kA po dobu 0,1 sekundy (6 cykl\u016f)<\/li>\n<\/ul>\n<p>In\u017een\u00fdrsk\u00e9 kompromisy pro jednotky ATS s kr\u00e1tkodobou jmenovitou odolnost\u00ed jsou v\u00fdznamn\u00e9. Konstrukce vy\u017eaduje t\u011b\u017e\u0161\u00ed sestavy kontakt\u016f s vylep\u0161en\u00fdmi materi\u00e1ly kontakt\u016f (\u010dasto slitiny st\u0159\u00edbra a wolframu), zv\u00fd\u0161en\u00e9 s\u00edly pru\u017ein p\u0159\u00edtlaku kontakt\u016f, aby se zabr\u00e1nilo elektromagnetick\u00e9mu odpuzov\u00e1n\u00ed, robustn\u00ed zh\u00e1\u0161ec\u00ed komory s pokro\u010dil\u00fdm zh\u00e1\u0161en\u00edm a zes\u00edlen\u00e9 r\u00e1mov\u00e9 konstrukce, aby odolaly elektrodynamick\u00fdm sil\u00e1m. Tato vylep\u0161en\u00ed obvykle zvy\u0161uj\u00ed n\u00e1klady na ATS o 30\u201360 % ve srovn\u00e1n\u00ed se standardn\u00edmi 3cyklov\u00fdmi ekvivalenty a mohou zv\u011bt\u0161it fyzick\u00e9 rozm\u011bry o 20\u201340 %.<\/p>\n<p>Dostupnost je dal\u0161\u00edm omezen\u00edm. V\u011bt\u0161ina v\u00fdrobc\u016f omezuje kr\u00e1tkodob\u00e9 jmenovit\u00e9 hodnoty na v\u011bt\u0161\u00ed r\u00e1my (\u2265400 A), kde fyzick\u00e1 velikost umo\u017e\u0148uje zes\u00edlenou konstrukci. N\u011bkter\u00e9 jmenovit\u00e9 hodnoty jsou k dispozici pouze v t\u0159\u00edp\u00f3lov\u00fdch konfigurac\u00edch pro jednof\u00e1zov\u00e9 aplikace kv\u016fli slo\u017eitosti dosa\u017een\u00ed jednotn\u00e9 kr\u00e1tkodob\u00e9 odolnosti v \u010dty\u0159p\u00f3lov\u00fdch konstrukc\u00edch, kde neutr\u00e1ln\u00ed p\u00f3l \u010del\u00ed odli\u0161n\u00fdm vzor\u016fm tepeln\u00e9ho nam\u00e1h\u00e1n\u00ed.<\/p>\n<p><strong>Kdy specifikovat ATS s kr\u00e1tkodobou jmenovitou odolnost\u00ed<\/strong>: Kritick\u00e9 aplikace vy\u017eaduj\u00edc\u00ed selektivn\u00ed koordinaci podle \u010dl\u00e1nku 700.28 NEC (nouzov\u00e9 syst\u00e9my), zdravotnick\u00e1 za\u0159\u00edzen\u00ed podle \u010dl\u00e1nku 517 NEC, datov\u00e1 centra s po\u017eadavky na spolehlivost \u00farovn\u011b III\/IV nebo jak\u00e1koli instalace, kde <a href=\"https:\/\/test.viox.com\/cs\/wiring-automatic-transfer-switch-hybrid-inverter\/\">koordinace automatick\u00e9ho p\u0159ep\u00edna\u010de<\/a> s \u010dasov\u011b zpo\u017ed\u011bn\u00fdmi jisti\u010di je nezbytn\u00e1 pro zachov\u00e1n\u00ed kontinuity provozu kritick\u00fdch z\u00e1t\u011b\u017e\u00ed.<\/p>\n<h3>3.3 Koordinace ATS s jisti\u010di: Rozhodovac\u00ed r\u00e1mec<\/h3>\n<p>Koordina\u010dn\u00ed vztah mezi ATS a jeho nadproudov\u00fdm ochrann\u00fdm za\u0159\u00edzen\u00edm neur\u010duje pouze adekv\u00e1tnost ochrany proti poruch\u00e1m, ale tak\u00e9 spolehlivost syst\u00e9mu b\u011bhem norm\u00e1ln\u00edho a nouzov\u00e9ho provozu. Pochopen\u00ed rozhodovac\u00edho r\u00e1mce zabra\u0148uje n\u00e1kladn\u00fdm chyb\u00e1m specifikace.<\/p>\n<p><strong>Sc\u00e9n\u00e1\u0159 1: Jisti\u010d kategorie A proti proudu (okam\u017eit\u00e9 vypnut\u00ed)<\/strong><\/p>\n<p>To p\u0159edstavuje nejjednodu\u0161\u0161\u00ed a nejb\u011b\u017en\u011bj\u0161\u00ed p\u0159\u00edpad koordinace. Jisti\u010d kategorie A proti proudu pracuje s okam\u017eit\u00fdm magnetick\u00fdm vypnut\u00edm a vyp\u00edn\u00e1 poruchy za 1\u20133 cykly (16\u201350 ms). Po\u017eadavek na specifikaci ATS je p\u0159\u00edmo\u010dar\u00fd:<\/p>\n<p><strong>WCR ATS \u2265 Dostupn\u00fd poruchov\u00fd proud v m\u00edst\u011b ATS<\/strong><\/p>\n<p>Pokud v\u00fdpo\u010dty zkratu indikuj\u00ed 35 kA dostupn\u00fdch na ATS, specifikujte ATS s minim\u00e1ln\u00edm WCR 35 kA pro zvolen\u00fd typ jisti\u010de (specifick\u00fd nebo \u201cjak\u00fdkoli jisti\u010d\u201d). ATS nemus\u00ed m\u00edt kr\u00e1tkodobou jmenovitou odolnost, proto\u017ee porucha se vypne v r\u00e1mci standardn\u00edho 3cyklov\u00e9ho testovac\u00edho okna.<\/p>\n<p><strong>Sc\u00e9n\u00e1\u0159 2: Jisti\u010d kategorie B s \u010dasov\u00fdm zpo\u017ed\u011bn\u00edm (selektivn\u00ed koordinace)<\/strong><\/p>\n<p>Tento sc\u00e9n\u00e1\u0159 p\u0159in\u00e1\u0161\u00ed zna\u010dnou slo\u017eitost. Jisti\u010d kategorie B proti proudu je konfigurov\u00e1n s kr\u00e1tkodob\u00fdm zpo\u017ed\u011bn\u00edm (obvykle 0,1 s a\u017e 0,5 s) pro koordinaci s pod\u0159\u00edzen\u00fdmi p\u0159\u00edvody. B\u011bhem tohoto zpo\u017ed\u011bn\u00ed mus\u00ed ATS odolat pln\u00e9mu poruchov\u00e9mu proudu bez p\u0159eru\u0161en\u00ed jisti\u010dem.<\/p>\n<p>Po\u017eadavky na specifikaci se st\u00e1vaj\u00ed:<\/p>\n<ol>\n<li><strong>ATS mus\u00ed m\u00edt kr\u00e1tkodobou jmenovitou odolnost<\/strong> odpov\u00eddaj\u00edc\u00ed nebo p\u0159ekra\u010duj\u00edc\u00ed nastaven\u00ed zpo\u017ed\u011bn\u00ed jisti\u010de<\/li>\n<li><strong>Jmenovit\u00fd kr\u00e1tkodob\u00fd proud ATS \u2265 Dostupn\u00fd poruchov\u00fd proud<\/strong><\/li>\n<li><strong>Jmenovit\u00fd proud Icw jisti\u010de \u2265 Dostupn\u00fd poruchov\u00fd proud<\/strong> po dobu trv\u00e1n\u00ed zpo\u017ed\u011bn\u00ed<\/li>\n<li><strong>Ov\u011b\u0159te I\u00b2t energii<sup>2<\/sup>: I\u00b2t<\/strong>cw(jisti\u010d) \u00d7 t(zpo\u017ed\u011bn\u00ed) A I\u00b2t<sup>2<\/sup>t(porucha) &lt; I<sup>2<\/sup>cw(ATS) \u00d7 t(jmenovit\u00e1 hodnota)<sup>2<\/sup>t(porucha) &lt; I<sup>2<\/sup>: In\u017een\u00fdr specifikuje ATS 600 A chr\u00e1n\u011bn\u00fd ACB 800 A konfigurovan\u00fdm s kr\u00e1tkodob\u00fdm zpo\u017ed\u011bn\u00edm 0,3 s pro koordinaci pod\u0159\u00edzen\u00e9ho obvodu. Dostupn\u00fd poruchov\u00fd proud v m\u00edst\u011b ATS je 42 kA ze zdroje nap\u00e1jen\u00ed. Po\u017eadovan\u00e9 specifikace:<\/li>\n<\/ol>\n<p><strong>P\u0159\u00edklad<\/strong>: An engineer specifies a 600A ATS protected by an 800A ACB configured with 0.3s short-time delay for downstream coordination. Available fault current at the ATS location is 42kA from the utility source. Required specifications:<\/p>\n<ul>\n<li>ATS: Minim\u00e1ln\u00ed zkratov\u00e1 odolnost 42kA po dobu 0,3 s (nebo vy\u0161\u0161\u00ed hodnota s krat\u0161\u00ed dobou, pokud I2t anal\u00fdza potvrd\u00ed dostate\u010dnost)<sup>2<\/sup>ACB: Icw \u2265 42kA po dobu minim\u00e1ln\u011b 0,3 s (Icw = 50kA po dobu 0,5 s by bylo dosta\u010duj\u00edc\u00ed)<\/li>\n<li>Ov\u011b\u0159it: (42kA)<\/li>\n<li>\u00d7 0,3 s = 529 MJ\/s &lt; jisti\u010d a ATS I2t schopnosti<sup>2<\/sup> Rozhodovac\u00ed faktor<sup>2<\/sup>Ochrana kategorie A<\/li>\n<\/ul>\n<table style=\"width: 100%; border-collapse: collapse; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Ochrana kategorie B s \u010dasov\u00fdm zpo\u017ed\u011bn\u00edm<\/th>\n<th>Typ jmenovit\u00e9 hodnoty ATS<\/th>\n<th>Standardn\u00ed 3-cyklov\u00e1 WCR<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Po\u017eadovan\u00e1 WCR s kr\u00e1tkodobou odolnost\u00ed<\/strong><\/td>\n<td>Slo\u017eitost koordinace<\/td>\n<td>Komplexn\u00ed \u2013 vy\u017eaduje I2t anal\u00fdzu<\/td>\n<\/tr>\n<tr>\n<td><strong>30-60% vy\u0161\u0161\u00ed pro ATS s kr\u00e1tkodobou odolnost\u00ed<\/strong><\/td>\n<td>Jednoduch\u00fd<\/td>\n<td>Riziko n\u00e1vrhu<sup>2<\/sup>N\u00edzk\u00e9 \u2013 standardn\u00ed aplikace<\/td>\n<\/tr>\n<tr>\n<td><strong>Relativn\u00ed n\u00e1klady<\/strong><\/td>\n<td>Spodn\u00ed<\/td>\n<td>Vy\u0161\u0161\u00ed \u2013 vy\u017eaduje podrobnou studii<\/td>\n<\/tr>\n<tr>\n<td><strong>Mal\u00e9 komer\u010dn\u00ed, reziden\u010dn\u00ed<\/strong><\/td>\n<td>Nemocnice, datov\u00e1 centra, nouzov\u00e9 syst\u00e9my<\/td>\n<td>3.4 B\u011b\u017en\u00e9 chyby koordinace: Co se v praxi pokaz\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>P\u0159\u00edklad aplikace<\/strong><\/td>\n<td>Obr\u00e1zek 5: Srovn\u00e1vac\u00ed anal\u00fdza ukazuj\u00edc\u00ed d\u016fsledky nesouladu koordinace. Vlevo: ATS s kr\u00e1tkodobou odolnost\u00ed p\u0159e\u017eije zpo\u017ed\u011bn\u00e9 vypnut\u00ed poruchy neporu\u0161en\u00e9. Vpravo: Standardn\u00ed 3-cyklov\u00e1 ATS katastrof\u00e1ln\u011b sel\u017ee, kdy\u017e je vystavena poruchov\u00fdm proud\u016fm p\u0159esahuj\u00edc\u00edm jej\u00ed 50ms jmenovit\u00e9 okno.<\/td>\n<td>Po p\u0159ezkoum\u00e1n\u00ed stovek instalac\u00ed ATS a studi\u00ed koordinace se objevilo n\u011bkolik opakuj\u00edc\u00edch se chyb, kter\u00e9 ohro\u017euj\u00ed bezpe\u010dnost a spolehlivost:<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Chyba \u010d. 1: Pou\u017eit\u00ed standardn\u00ed 3-cyklov\u00e9 ATS s jisti\u010dem s \u010dasov\u00fdm zpo\u017ed\u011bn\u00edm<\/h3>\n<figure style=\"margin: 30px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto;\" src=\"https:\/\/img.viox.com\/Comparison-diagram-illustrating-correct-vs-incorrect-ATS-circuit-breaker-coordination-showing-proper-short-time-rated-ATS-versus-standard-ATS-failure-scenarios---VIOX-Electric.webp\" alt=\"Comparison diagram illustrating correct versus incorrect ATS circuit breaker coordination scenarios\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 10px; font-size: 0.9em;\">. Toto je nej\u010dast\u011bj\u0161\u00ed chyba. Projektant specifikuje selektivn\u00ed koordinaci vy\u017eaduj\u00edc\u00ed 0,2s zpo\u017ed\u011bn\u00ed jisti\u010de, ale neupgraduje specifikaci ATS ze standardn\u00ed na kr\u00e1tkodobou. B\u011bhem prvn\u00ed v\u00fdznamn\u00e9 poruchy se kontakty ATS sva\u0159\u00ed nebo utrp\u00ed po\u0161kozen\u00ed obloukem, proto\u017ee byly vystaveny poruchov\u00e9mu proudu po dobu 200 ms \u2013 \u010dty\u0159ikr\u00e1t del\u0161\u00ed, ne\u017e je jejich jmenovit\u00e1 odolnost. Syst\u00e9m m\u00e1 nyn\u00ed vadn\u00fd p\u0159ep\u00edna\u010d a potenci\u00e1ln\u011b \u017e\u00e1dnou nouzovou nap\u00e1jec\u00ed schopnost.<\/figcaption><\/figure>\n<p>Chyba \u010d. 2: Nedostate\u010dn\u00e1 dokumentace SCCR na poln\u00edch ozna\u010den\u00edch<\/p>\n<p><strong>. NEC 110.24 vy\u017eaduje poln\u00ed ozna\u010den\u00ed dostupn\u00e9ho poruchov\u00e9ho proudu na servisn\u00edm za\u0159\u00edzen\u00ed. U instalac\u00ed ATS mus\u00ed poln\u00ed ozna\u010den\u00ed zohled\u0148ovat z\u00e1vislost ATS na charakteristik\u00e1ch OCPD proti proudu. Mnoho instalac\u00ed nespr\u00e1vn\u011b ozna\u010duje pouze vypo\u010dten\u00fd poruchov\u00fd proud bez dokumentace, \u017ee hodnota ATS je platn\u00e1 pouze s konkr\u00e9tn\u00edm nastaven\u00edm jisti\u010de. Kdy\u017e \u00fadr\u017eb\u00e1\u0159i pozd\u011bji uprav\u00ed nastaven\u00ed jisti\u010de (mo\u017en\u00e1 povol\u00ed okam\u017eit\u00e9 vypnut\u00ed, kter\u00e9 bylo d\u0159\u00edve deaktivov\u00e1no), zneplatn\u00ed hodnocen\u00ed ATS, ani\u017e by si to uv\u011bdomili.<\/strong>. Chyba \u010d. 3: Ignorov\u00e1n\u00ed po\u017eadavk\u016f selektivn\u00ed koordinace NEC 700.28 pro nouzov\u00e9 syst\u00e9my.<\/p>\n<p><strong>. Projektanti n\u011bkdy aplikuj\u00ed standardn\u00ed postupy ochrany distribuce na nouzov\u00e9 syst\u00e9my, ani\u017e by si uv\u011bdomili, \u017ee NEC 700.28 na\u0159izuje selektivn\u00ed koordinaci. V\u00fdsledn\u00fd n\u00e1vrh pou\u017e\u00edv\u00e1 okam\u017eit\u00e9 vypnut\u00ed na v\u0161ech jisti\u010d\u00edch (\u017e\u00e1dn\u00e1 selektivita) nebo dosahuje selektivity pouze v rozsahu p\u0159et\u00ed\u017een\u00ed, ale ne za podm\u00ednek zkratu (\u010d\u00e1ste\u010dn\u00e1 selektivita). Selh\u00e1n\u00ed souladu s p\u0159edpisy b\u011bhem inspekce vy\u017eaduj\u00ed n\u00e1kladn\u00fd p\u0159epracov\u00e1n\u00ed.<\/strong>. Chyba \u010d. 4: Neberou se v \u00favahu rozd\u00edly impedance zdroje gener\u00e1toru vs. utility.<\/p>\n<p><strong>. Dostupn\u00fd poruchov\u00fd proud z pohotovostn\u00edho gener\u00e1toru je obvykle 4-10kr\u00e1t ni\u017e\u0161\u00ed ne\u017e z utility kv\u016fli subtransientn\u00ed reaktanci gener\u00e1toru. ATS chr\u00e1n\u011bn\u00e1 jisti\u010dem s jmenovit\u00fdm proudem 65 kA m\u016f\u017ee vid\u011bt 52 kA z utility, ale pouze 15 kA z gener\u00e1toru. Projektanti n\u011bkdy specifikuj\u00ed hodnoty ATS pouze na z\u00e1klad\u011b \u00farovn\u00ed poruchy utility a pot\u00e9 b\u011bhem testov\u00e1n\u00ed z\u00e1t\u011b\u017ee gener\u00e1toru zjist\u00ed, \u017ee<\/strong>. koordinace zdroje gener\u00e1toru.<\/p>\n<p><strong>vytv\u00e1\u0159\u00ed r\u016fzn\u00e9 probl\u00e9my s \u010dasov\u011b-proudovou koordinac\u00ed vy\u017eaduj\u00edc\u00ed samostatnou anal\u00fdzu.<\/strong>. : P\u0159ed finalizac\u00ed jak\u00e9koli specifikace ATS pro kritickou aplikaci prove\u010fte kompletn\u00ed studii koordinace, kter\u00e1 zahrnuje zdroje poruch utility i gener\u00e1toru, modeluje v\u0161echny \u010dasov\u011b-proudov\u00e9 k\u0159ivky ochrann\u00fdch za\u0159\u00edzen\u00ed v\u010detn\u011b nastaven\u00ed zpo\u017ed\u011bn\u00ed jisti\u010de, ov\u011b\u0159uje schopnosti ATS odolat nejhor\u0161\u00edm sc\u00e9n\u00e1\u0159\u016fm a dokumentuje nastaven\u00ed OCPD, kter\u00e1 udr\u017euj\u00ed ov\u011b\u0159enou koordinaci. Tuto studii by m\u011bl oraz\u00edt licencovan\u00fd PE a zahrnout do dokument\u016f o uzav\u0159en\u00ed projektu. <a href=\"https:\/\/test.viox.com\/cs\/wiring-automatic-transfer-switch-hybrid-inverter\/\">\u010c\u00e1st 4: Praktick\u00e9 specifikace a strategie n\u00e1vrhu<\/a> 4.1 Proces koordinace krok za krokem: In\u017een\u00fdrsk\u00e1 metodologie.<\/p>\n<p><strong>Profesion\u00e1ln\u00ed tip<\/strong>\u00dasp\u011b\u0161n\u00e1 koordinace ATS-jisti\u010d vy\u017eaduje systematickou anal\u00fdzu podle osv\u011bd\u010den\u00e9 metodologie. Zde je in\u017een\u00fdrsk\u00fd proces, kter\u00fd zaji\u0161\u0165uje spolehliv\u00e9 v\u00fdsledky:.<\/p>\n<h2>Krok 1: Vypo\u010d\u00edtejte dostupn\u00fd poruchov\u00fd proud v um\u00edst\u011bn\u00ed ATS<\/h2>\n<h3>Prove\u010fte anal\u00fdzu zkratu pomoc\u00ed dostupn\u00e9ho poruchov\u00e9ho proudu na vstupu slu\u017eby, sekund\u00e1rn\u00edm vinut\u00ed transform\u00e1toru nebo svork\u00e1ch gener\u00e1toru a pot\u00e9 vypo\u010d\u00edtejte poruchov\u00fd proud v navrhovan\u00e9m um\u00edst\u011bn\u00ed ATS s ohledem na impedanci kabelu, impedanci transform\u00e1toru a impedanci zdroje. Analyzujte zdroje utility i gener\u00e1toru samostatn\u011b, proto\u017ee p\u0159edstavuj\u00ed dramaticky odli\u0161n\u00e9 \u00farovn\u011b poruchov\u00e9ho proudu. Pou\u017eijte pr\u016fmyslov\u00fd standardn\u00ed software (SKM PowerTools, ETAP, EASYPOWER) nebo metody ru\u010dn\u00edho v\u00fdpo\u010dtu podle IEEE 141 (Red Book).<\/h3>\n<p>Krok 2: Ur\u010dete po\u017eadavky na selektivn\u00ed koordinaci<\/p>\n<p><strong>Zkontrolujte p\u0159\u00edslu\u0161n\u00e9 k\u00f3dy (NEC \u010dl\u00e1nky 700, 517, 708), specifikace po\u017eadavk\u016f vlastn\u00edka a anal\u00fdzu provozn\u00ed kriti\u010dnosti. Ur\u010dete, zda je selektivn\u00ed koordinace povinn\u00e1 (nouzov\u00e9 syst\u00e9my, zdravotnictv\u00ed), doporu\u010den\u00e1 (kritick\u00e9 procesy) nebo voliteln\u00e1 (obecn\u00e1 distribuce). Dokumentujte po\u017eadovanou \u00farove\u0148 koordinace: \u00fapln\u00e1 selektivita (v\u0161echny poruchov\u00e9 proudy) nebo \u010d\u00e1ste\u010dn\u00e1 selektivita (a\u017e do limitu selektivity).<\/strong><\/p>\n<p>Krok 3: Vyberte typ a nastaven\u00ed OCPD proti proudu.<\/p>\n<p><strong>Na z\u00e1klad\u011b po\u017eadavk\u016f na koordinaci zvolte vhodnou strategii ochrany:<\/strong><\/p>\n<p>Pokud je p\u0159ijateln\u00e9 okam\u017eit\u00e9 vypnut\u00ed.<\/p>\n<p><strong>: Jisti\u010d kategorie A je vhodn\u00fd \u2013 jednodu\u0161\u0161\u00ed a levn\u011bj\u0161\u00ed. Pokra\u010dujte ke kroku 4 s ov\u011b\u0159en\u00edm standardn\u00ed hodnoty ATS.<\/strong><\/p>\n<p>Pokud je pro selektivitu pot\u0159eba \u010dasov\u00e9 zpo\u017ed\u011bn\u00ed<\/p>\n<ul>\n<li><strong>: Je vy\u017eadov\u00e1n jisti\u010d kategorie B. Ur\u010dete nezbytn\u00e9 nastaven\u00ed zpo\u017ed\u011bn\u00ed (0,1 s, 0,2 s, 0,4 s) na z\u00e1klad\u011b studie koordinace se za\u0159\u00edzen\u00edmi po proudu. Ov\u011b\u0159te, zda m\u00e1 jisti\u010d dostate\u010dnou hodnotu Icw pro zvolen\u00e9 zpo\u017ed\u011bn\u00ed p\u0159i dostupn\u00e9m poruchov\u00e9m proudu. Uv\u011bdomte si, \u017ee bude vy\u017eadov\u00e1na ATS s kr\u00e1tkodobou odolnost\u00ed.<\/strong>Krok 4: Sla\u010fte hodnotu ATS s charakteristikami OCPD.<\/li>\n<li><strong>Propojte v\u00fdb\u011br OCPD s hodnotami ATS:<\/strong>OCPD s \u010dasov\u00fdm zpo\u017ed\u011bn\u00edm \u2192 Je vy\u017eadov\u00e1na ATS s kr\u00e1tkodobou odolnost\u00ed.<\/li>\n<\/ul>\n<p><strong>: Vyberte ATS s kr\u00e1tkodobou odolnost\u00ed \u2265 dostupn\u00fd poruchov\u00fd proud a \u010dasovou hodnotou \u2265 nastaven\u00ed zpo\u017ed\u011bn\u00ed jisti\u010de. P\u0159\u00edklad: 0,2s zpo\u017ed\u011bn\u00ed jisti\u010de vy\u017eaduje ATS s minim\u00e1ln\u00ed 0,2s kr\u00e1tkodobou odolnost\u00ed (nebo vy\u0161\u0161\u00ed proudovou hodnotou s krat\u0161\u00ed dobou, pokud I2t anal\u00fdza ov\u011b\u0159\u00ed).<\/strong><\/p>\n<p>Okam\u017eit\u00e9 OCPD \u2192 Standardn\u00ed 3-cyklov\u00e1 ATS je p\u0159ijateln\u00e1<\/p>\n<ul>\n<li><strong>: Ov\u011b\u0159te WCR ATS \u2265 dostupn\u00fd poruchov\u00fd proud pro specifickou nebo \u201ejakoukoli kategorii jisti\u010de\u201c odpov\u00eddaj\u00edc\u00ed va\u0161emu v\u00fdb\u011bru OCPD.<\/strong>Krok 5: Ov\u011b\u0159te \u0159et\u011bzec koordinace po proudu<sup>2<\/sup>Potvr\u010fte, \u017ee cel\u00fd distribu\u010dn\u00ed syst\u00e9m od slu\u017eby utility p\u0159es ATS k nap\u00e1je\u010d\u016fm z\u00e1t\u011b\u017ee udr\u017euje koordinaci na v\u0161ech \u00farovn\u00edch. Vykreslete \u010dasov\u011b-proudov\u00e9 k\u0159ivky pro v\u0161echna za\u0159\u00edzen\u00ed v s\u00e9rii. Ov\u011b\u0159te dostate\u010dn\u00e9 \u010dasov\u00e9 odd\u011blen\u00ed (minimum 0,1 s mezi sousedn\u00edmi \u00farovn\u011bmi) a odd\u011blen\u00ed proudov\u00e9 velikosti (pom\u011br \u2265 1,6:1 pro proudovou selektivitu). Zkontrolujte, zda nedoch\u00e1z\u00ed k pr\u016fse\u010d\u00edk\u016fm k\u0159ivek v rozsahu provozn\u00edho poruchov\u00e9ho proudu.<\/li>\n<li><strong>4.2 In\u017een\u00fdrsk\u00e9 osv\u011bd\u010den\u00e9 postupy: Profesion\u00e1ln\u00ed standardy<\/strong>Implementace t\u011bchto postup\u016f odli\u0161uje profesion\u00e1ln\u00ed in\u017een\u00fdrstv\u00ed od specifikace rulety:.<\/li>\n<\/ul>\n<p><strong>P\u0159ed specifikac\u00ed ATS a OCPD v\u017edy prove\u010fte komplexn\u00ed studii zkratu<\/strong><\/p>\n<p>. Nikdy se nespol\u00e9hejte na odhady podle pravidla palce nebo \u201etypick\u00e9\u201c hodnoty. Dostupn\u00fd poruchov\u00fd proud se dramaticky li\u0161\u00ed v z\u00e1vislosti na kapacit\u011b utility, velikosti transform\u00e1toru, d\u00e9lce kabelu a impedanci zdroje. Chyba 21% ve v\u00fdpo\u010dtu impedance m\u016f\u017ee zp\u016fsobit chybu 30% v poruchov\u00e9m proudu, co\u017e m\u016f\u017ee zneplatnit v\u0161echny hodnoty ochrann\u00fdch za\u0159\u00edzen\u00ed.<\/p>\n<h3>Dokumentujte typ OCPD, nastaven\u00ed a vztah hodnocen\u00ed ATS v konstruk\u010dn\u00ed dokumentaci<\/h3>\n<p>. Vytvo\u0159te zpr\u00e1vu o koordinaci ochrany, kter\u00e1 v\u00fdslovn\u011b uv\u00e1d\u00ed: \u201eATS Model XYZ s jmenovit\u00fdm SCCR 65 kA je platn\u00fd POUZE p\u0159i ochran\u011b jisti\u010dem Model ABC, r\u00e1m 800 A, s nastaven\u00edm: Ir=0,9\u00d7In, Isd=8\u00d7Ir, tsd=0,2 s, Ii=OFF (okam\u017eit\u00e9 vypnut\u00ed deaktivov\u00e1no).\u201c Zahr\u0148te tyto informace do jednop\u00f3lov\u00fdch sch\u00e9mat a rozvrh\u016f panel\u016f. Ozna\u010dte za\u0159\u00edzen\u00ed v ter\u00e9nu podle NEC 110.24 s uveden\u00edm z\u00e1vislosti.<\/p>\n<p><strong>Zva\u017ete budouc\u00ed r\u016fst z\u00e1t\u011b\u017ee a zm\u011bny \u00farovn\u011b poruchy<\/strong>. Never rely on rule-of-thumb estimates or \u201ctypical\u201d values. Available fault current varies dramatically based on utility capacity, transformer size, cable length, and source impedance. A 2% error in impedance calculation can produce a 30% error in fault current, potentially invalidating all protective device ratings.<\/p>\n<p><strong>Document OCPD type, settings, and ATS rating relationship in construction documents<\/strong>. Create a protection coordination report that explicitly states: \u201cATS Model XYZ rated 65kA SCCR is valid ONLY when protected by Breaker Model ABC, 800A frame, with settings: Ir=0.9\u00d7In, Isd=8\u00d7Ir, tsd=0.2s, Ii=OFF (instantaneous disabled).\u201d Include this information on one-line diagrams and panel schedules. Field-mark equipment per NEC 110.24 with dependency noted.<\/p>\n<p><strong>Consider future load growth and fault level changes<\/strong>. Poruchov\u00fd proud s\u00edt\u011b se m\u016f\u017ee zv\u00fd\u0161it, pokud dojde k modernizaci rozvoden nebo k p\u0159ipojen\u00ed dal\u0161\u00edch zdroj\u016f energie v okol\u00ed. Specifikujte jmenovit\u00e9 hodnoty ochrann\u00fdch prvk\u016f s rezervou 20-30 % nad vypo\u010dten\u00fdmi hodnotami, abyste zajistili rozumn\u00fd budouc\u00ed r\u016fst bez nutnosti v\u00fdm\u011bny za\u0159\u00edzen\u00ed.<\/p>\n<p><strong>Pou\u017e\u00edvejte koordina\u010dn\u00ed tabulky a testovac\u00ed data od v\u00fdrobce.<\/strong>. Nep\u0159edpokl\u00e1dejte koordinaci pouze na z\u00e1klad\u011b vykreslen\u00ed k\u0159ivek \u2013 energetick\u00e1 selektivita a charakteristiky omezov\u00e1n\u00ed proudu ovliv\u0148uj\u00ed koordinaci zp\u016fsoby, kter\u00e9 \u010dasov\u011b-proudov\u00e9 k\u0159ivky neodhal\u00ed. Pou\u017e\u00edvejte selektivn\u00ed tabulky poskytnut\u00e9 v\u00fdrobcem, kter\u00e9 dokumentuj\u00ed testovan\u00e9 kombinace, nebo si vy\u017e\u00e1dejte testovac\u00ed data z v\u00fdroby pro vlastn\u00ed aplikace.<\/p>\n<p><strong>Ov\u011b\u0159te v ter\u00e9nu, zda nastaven\u00ed instalovan\u00fdch nadproudov\u00fdch ochrann\u00fdch prvk\u016f odpov\u00edd\u00e1 z\u00e1m\u011bru n\u00e1vrhu.<\/strong>. Kontrola kvality konstrukce mus\u00ed zahrnovat ov\u011b\u0159en\u00ed, zda jsou elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky naprogramov\u00e1ny podle koordina\u010dn\u00ed studie, a ne ponech\u00e1ny na v\u00fdchoz\u00edm nastaven\u00ed z v\u00fdroby. Jedin\u00e9 nespr\u00e1vn\u00e9 nastaven\u00ed zpo\u017ed\u011bn\u00ed znehodnocuje m\u011bs\u00edce in\u017een\u00fdrsk\u00e9 koordina\u010dn\u00ed anal\u00fdzy.<\/p>\n<h3>4.3 Anal\u00fdza n\u00e1klad\u016f a p\u0159\u00ednos\u016f: Inteligentn\u00ed kompromisy<\/h3>\n<p>Jednotky ATS s kr\u00e1tkodobou jmenovitou hodnotou maj\u00ed pr\u00e9miov\u00e9 ceny \u2013 obvykle o 30-60 % vy\u0161\u0161\u00ed ne\u017e ekvivalentn\u00ed modely se standardn\u00ed jmenovitou hodnotou. Kdy m\u00e1 tato investice in\u017een\u00fdrsk\u00fd a ekonomick\u00fd smysl?<\/p>\n<p><strong>Povinn\u00e9 investi\u010dn\u00ed sc\u00e9n\u00e1\u0159e<\/strong> kde je ATS s kr\u00e1tkodobou jmenovitou hodnotou nevyjednateln\u00fd:<\/p>\n<ul>\n<li>Syst\u00e9my nouzov\u00e9ho nap\u00e1jen\u00ed vy\u017eaduj\u00edc\u00ed selektivn\u00ed koordinaci podle NEC 700.28<\/li>\n<li>Zdravotnick\u00e1 za\u0159\u00edzen\u00ed podle \u010dl\u00e1nku 517 NEC (prostory pro p\u00e9\u010di o pacienty)<\/li>\n<li>Syst\u00e9my kritick\u00e9ho provozu (COPS) podle \u010dl\u00e1nku 708 NEC<\/li>\n<li>Datov\u00e1 centra kritick\u00e1 pro provoz se specifikacemi spolehlivosti \u00farovn\u011b III\/IV<\/li>\n<li>Jak\u00e1koli aplikace, kde platn\u00e9 p\u0159edpisy nebo smluvn\u00ed specifikace v\u00fdslovn\u011b vy\u017eaduj\u00ed selektivn\u00ed koordinaci<\/li>\n<\/ul>\n<p><strong>Sc\u00e9n\u00e1\u0159e investic s vysokou hodnotou<\/strong> kde ATS s kr\u00e1tkodobou jmenovitou hodnotou poskytuje provozn\u00ed v\u00fdhody:<\/p>\n<ul>\n<li>V\u00fdrobn\u00ed z\u00e1vody, kde prostoje ve v\u00fdrob\u011b p\u0159esahuj\u00ed 10 000 K\u010d\/hodinu<\/li>\n<li>Komer\u010dn\u00ed budovy s r\u016fzn\u00fdmi n\u00e1jemn\u00edky, kde izolace poruch zabra\u0148uje v\u00fdpadk\u016fm pro v\u00edce n\u00e1jemn\u00edk\u016f<\/li>\n<li>Distribu\u010dn\u00ed syst\u00e9my kampusu, kde m\u00e1 udr\u017eov\u00e1n\u00ed \u010d\u00e1ste\u010dn\u00e9ho provozu b\u011bhem poruch vysokou hodnotu<\/li>\n<li>Za\u0159\u00edzen\u00ed s v\u00edce gener\u00e1torov\u00fdmi soustroj\u00edmi, kde <a href=\"https:\/\/test.viox.com\/cs\/wiring-automatic-transfer-switch-hybrid-inverter\/\">strategie paraleln\u00edho provozu gener\u00e1tor\u016f<\/a> t\u011b\u017e\u00ed z koordinovan\u00e9 ochrany<\/li>\n<\/ul>\n<p><strong>Alternativn\u00ed strategie<\/strong> kter\u00e9 mohou poskytnout adekv\u00e1tn\u00ed ochranu za ni\u017e\u0161\u00ed cenu:<\/p>\n<p><strong>Pojistky omezuj\u00edc\u00ed proud proti proudu<\/strong>: Pojistky t\u0159\u00eddy J, L nebo RK1 poskytuj\u00ed inherentn\u00ed selektivitu d\u00edky sv\u00e9 charakteristice omezov\u00e1n\u00ed energie bez \u010dasov\u00fdch zpo\u017ed\u011bn\u00ed. Pojistkov\u00fd odpojova\u010d proti proudu ATS m\u016f\u017ee umo\u017enit pou\u017eit\u00ed ATS se standardn\u00ed jmenovitou hodnotou p\u0159i dosa\u017een\u00ed vynikaj\u00edc\u00ed koordinace. Kompromis: Pojistky jsou jednor\u00e1zov\u00e1 za\u0159\u00edzen\u00ed vy\u017eaduj\u00edc\u00ed v\u00fdm\u011bnu po provozu, zat\u00edmco jisti\u010de se resetuj\u00ed.<\/p>\n<p><strong>Zdroje s vy\u0161\u0161\u00ed impedanc\u00ed<\/strong>: Specifikace gener\u00e1tor\u016f nebo transform\u00e1tor\u016f s \u00famysln\u011b vy\u0161\u0161\u00ed impedanc\u00ed sni\u017euje dostupn\u00fd poruchov\u00fd proud na ATS, co\u017e potenci\u00e1ln\u011b umo\u017e\u0148uje, aby standardn\u00ed jmenovit\u00e1 hodnota byla adekv\u00e1tn\u00ed i p\u0159i m\u00edrn\u00fdch zpo\u017ed\u011bn\u00edch jisti\u010de. Kompromis: Vy\u0161\u0161\u00ed impedance zvy\u0161uje pokles nap\u011bt\u00ed a m\u016f\u017ee ovlivnit schopnost spou\u0161t\u011bn\u00ed motoru.<\/p>\n<p><strong>Z\u00f3nov\u00e9 selektivn\u00ed blokov\u00e1n\u00ed (ZSI)<\/strong>: Pokro\u010dil\u00e1 komunikace mezi spou\u0161t\u011bc\u00edmi jednotkami jisti\u010de umo\u017e\u0148uje inteligentn\u00ed selektivitu, kdy jisti\u010de po proudu vys\u00edlaj\u00ed sign\u00e1ly \u201czdr\u017een\u00ed\u201d do za\u0159\u00edzen\u00ed proti proudu b\u011bhem poruch. To m\u016f\u017ee sn\u00ed\u017eit po\u017eadovan\u00e9 doby zpo\u017ed\u011bn\u00ed, co\u017e potenci\u00e1ln\u011b umo\u017e\u0148uje standardn\u00ed jmenovit\u00e9 hodnoty ATS. Kompromis: Zv\u00fd\u0161en\u00e1 slo\u017eitost syst\u00e9mu a vy\u0161\u0161\u00ed n\u00e1klady na jisti\u010de.<\/p>\n<h3>4.4 In\u017een\u00fdrsk\u00e1 podpora VIOX: Technick\u00e9 zdroje a koordina\u010dn\u00ed slu\u017eby<\/h3>\n<p>Spole\u010dnost VIOX Electric si uv\u011bdomuje, \u017ee koordinace ATS-jisti\u010d p\u0159edstavuje jeden z technicky nejn\u00e1ro\u010dn\u011bj\u0161\u00edch aspekt\u016f n\u00e1vrhu z\u00e1lo\u017en\u00edho nap\u00e1jec\u00edho syst\u00e9mu. N\u00e1\u0161 in\u017een\u00fdrsk\u00fd t\u00fdm poskytuje komplexn\u00ed podp\u016frn\u00e9 slu\u017eby, kter\u00e9 zajist\u00ed, \u017ee va\u0161e specifikace dos\u00e1hnou jak bezpe\u010dnosti, tak provozn\u00ed spolehlivosti.<\/p>\n<p>Na\u0161e knihovna technick\u00fdch zdroj\u016f zahrnuje podrobn\u00e9 aplika\u010dn\u00ed p\u0159\u00edru\u010dky, kter\u00e9 se zab\u00fdvaj\u00ed <a href=\"https:\/\/test.viox.com\/cs\/circuit-breaker-ratings-icu-ics-icw-icm\/\">z\u00e1klady jmenovit\u00fdch hodnot jisti\u010d\u016f<\/a>, <a href=\"https:\/\/test.viox.com\/cs\/ats-troubleshooting-guide\/\">krit\u00e9ria v\u00fdb\u011bru p\u0159ep\u00edna\u010d\u016f<\/a>a <a href=\"https:\/\/test.viox.com\/cs\/wiring-automatic-transfer-switch-hybrid-inverter\/\">strategie integrace gener\u00e1tor-ATS<\/a>. Tyto zdroje poskytuj\u00ed technickou hloubku nezbytnou pro informovan\u00fd v\u00fdb\u011br za\u0159\u00edzen\u00ed a n\u00e1vrh syst\u00e9mu.<\/p>\n<p>Pro slo\u017eit\u00e9 koordina\u010dn\u00ed v\u00fdzvy nab\u00edz\u00ed VIOX in\u017een\u00fdrsk\u00e9 konzulta\u010dn\u00ed slu\u017eby, kter\u00e9 zahrnuj\u00ed ov\u011b\u0159en\u00ed anal\u00fdzy zkratu, \u010dasov\u011b-proudov\u00e9 koordina\u010dn\u00ed studie, validaci SCCR a kontrolu souladu s selektivn\u00ed koordinac\u00ed NEC. Na\u0161i aplika\u010dn\u00ed in\u017een\u00fd\u0159i \u00fazce spolupracuj\u00ed s va\u0161\u00edm n\u00e1vrh\u00e1\u0159sk\u00fdm t\u00fdmem na v\u00fdvoji sch\u00e9mat ochrany, kter\u00e1 vyva\u017euj\u00ed bezpe\u010dnost, spolehlivost a n\u00e1kladovou efektivitu pro va\u0161e specifick\u00e9 po\u017eadavky aplikace.<\/p>\n<p>Obra\u0165te se na technickou podporu VIOX, abyste prodiskutovali sv\u00e9 probl\u00e9my s koordinac\u00ed p\u0159ep\u00edna\u010d\u016f a z\u00edskali p\u0159\u00edstup k na\u0161im in\u017een\u00fdrsk\u00fdm zdroj\u016fm. Jsme odhodl\u00e1ni zajistit, aby va\u0161e z\u00e1lo\u017en\u00ed nap\u00e1jec\u00ed syst\u00e9my poskytovaly spolehliv\u00fd v\u00fdkon, kdy\u017e kritick\u00e9 z\u00e1t\u011b\u017ee vy\u017eaduj\u00ed nep\u0159etr\u017eit\u00fd provoz.<\/p>\n<hr \/>\n<h2>\u010cASTO KLADEN\u00c9 DOTAZY<\/h2>\n<p><strong>Ot\u00e1zka 1: Jak\u00fd je rozd\u00edl mezi jisti\u010di kategorie A a kategorie B?<\/strong><\/p>\n<p>Jisti\u010de kategorie A pracuj\u00ed s okam\u017eit\u00fdm vypnut\u00edm a bez \u00famysln\u00e9ho kr\u00e1tkodob\u00e9ho zpo\u017ed\u011bn\u00ed \u2013 jsou navr\u017eeny tak, aby co nejrychleji odstranily poruchy (obvykle 10-20 ms). Jisti\u010de kategorie B lze konfigurovat s nastaviteln\u00fdmi kr\u00e1tkodob\u00fdmi zpo\u017ed\u011bn\u00edmi (0,05-1,0 s), aby se umo\u017enila \u010dasov\u011b zalo\u017een\u00e1 selektivn\u00ed koordinace, a maj\u00ed jmenovit\u00e9 hodnoty Icw, kter\u00e9 potvrzuj\u00ed jejich schopnost odolat poruchov\u00fdm proud\u016fm b\u011bhem doby zpo\u017ed\u011bn\u00ed. Jisti\u010de kategorie A se pou\u017e\u00edvaj\u00ed pro nap\u00e1je\u010de a odbo\u010dn\u00e9 obvody; Jisti\u010de kategorie B se pou\u017e\u00edvaj\u00ed na hlavn\u00edch p\u0159\u00edvodech a pozic\u00edch propojovac\u00edch p\u0159\u00edpojnic, kde je vy\u017eadov\u00e1na koordinace.<\/p>\n<p><strong>Q2: Maj\u00ed v\u0161echny automatick\u00e9 p\u0159ep\u00edna\u010de Icw jmenovit\u00e9 hodnoty?<\/strong><\/p>\n<p>Ne. Pouze jednotky ATS s kr\u00e1tkodobou jmenovitou hodnotou maj\u00ed specifikace Icw. Standardn\u00ed jednotky ATS jsou dimenzov\u00e1ny na 3cyklov\u00e9 (50ms) vydr\u017een\u00ed a nemaj\u00ed jmenovit\u00e9 hodnoty Icw, proto\u017ee jsou navr\u017eeny pro pou\u017eit\u00ed s ochranou s okam\u017eit\u00fdm vypnut\u00edm, kter\u00e1 odstra\u0148uje poruchy v 3cyklov\u00e9m okn\u011b. Pokud va\u0161e aplikace vy\u017eaduje koordinaci s \u010dasov\u011b zpo\u017ed\u011bn\u00fdmi jisti\u010di, mus\u00edte specifikovat ATS s kr\u00e1tkodobou jmenovitou hodnotou s jmenovitou hodnotou Icw odpov\u00eddaj\u00edc\u00ed va\u0161im po\u017eadavk\u016fm na zpo\u017ed\u011bn\u00ed koordinace.<\/p>\n<p><strong>Q3: Mohu pou\u017e\u00edt standardn\u00ed 3cyklov\u00fd ATS s jisti\u010dem s \u010dasov\u00fdm zpo\u017ed\u011bn\u00edm?<\/strong><\/p>\n<p>Ne \u2013 jedn\u00e1 se o nebezpe\u010dn\u00e9 neshody, kter\u00e9 vedou k selh\u00e1n\u00ed ATS. Standardn\u00ed 3cyklov\u00fd ATS je testov\u00e1n tak, aby vydr\u017eel poruchov\u00fd proud po dobu p\u0159ibli\u017en\u011b 50 milisekund, ne\u017e vypne nad\u0159azen\u00fd jisti\u010d. Pokud nakonfigurujete nad\u0159azen\u00fd jisti\u010d se zpo\u017ed\u011bn\u00edm 0,2 s (200 milisekund) pro selektivn\u00ed koordinaci, je ATS vystaven poruchov\u00e9mu proudu po dobu \u010dty\u0159n\u00e1sobku jmenovit\u00e9 v\u00fddr\u017ee, co\u017e zp\u016fsob\u00ed sva\u0159ov\u00e1n\u00ed kontakt\u016f, po\u0161kozen\u00ed obloukem nebo katastrof\u00e1ln\u00ed selh\u00e1n\u00ed. \u010casov\u011b zpo\u017ed\u011bn\u00e9 jisti\u010de vy\u017eaduj\u00ed jednotky ATS dimenzovan\u00e9 na zkratovou odolnost.<\/p>\n<p><strong>Q4: Jak spo\u010d\u00edt\u00e1m, zda m\u016fj ATS vydr\u017e\u00ed zkratov\u00fd proud b\u011bhem koordinace jisti\u010d\u016f?<\/strong><\/p>\n<p>Ov\u011b\u0159te, zda je tepeln\u00e1 energie (I\u00b2t) z poruchy men\u0161\u00ed ne\u017e schopnost vydr\u017eet jisti\u010de i ATS: Icw(ATS) \u00d7 t(jmenovit\u00e1 hodnota). P\u0159\u00edklad: Porucha 40 kA s 0,3s zpo\u017ed\u011bn\u00edm jisti\u010de produkuje I\u00b2t = (40 kA)\u00b2 \u00d7 0,3 s = 480 MJ\/s. V\u00e1\u0161 ATS mus\u00ed m\u00edt kr\u00e1tkodobou jmenovitou hodnotu \u2265 40 kA pro \u2265 0,3 s a v\u00e1\u0161 jisti\u010d mus\u00ed m\u00edt Icw \u2265 40 kA pro minim\u00e1ln\u011b 0,3 s. V\u017edy zahr\u0148te 10-20% bezpe\u010dnostn\u00ed rezervu do t\u011bchto v\u00fdpo\u010dt\u016f.<sup>2<\/sup>Ot\u00e1zka 5: Co znamen\u00e1 \u201eselektivn\u00ed koordinace\u201c pro instalace ATS?<sup>2<\/sup>t(porucha) &lt; I<sup>2<\/sup>cw(ATS) \u00d7 t(jmenovit\u00e1 hodnota)<sup>2<\/sup>t(porucha) &lt; I<sup>2<\/sup>ATS s kr\u00e1tkodobou jmenovitou hodnotou je povinn\u00fd, kdy\u017e: (1) Jisti\u010d proti proudu pou\u017e\u00edv\u00e1 \u00famysln\u00e1 \u010dasov\u00e1 zpo\u017ed\u011bn\u00ed (jisti\u010d kategorie B) pro selektivn\u00ed koordinaci, nebo (2) specifikace NEC nebo smlouvy v\u00fdslovn\u011b vy\u017eaduj\u00ed selektivn\u00ed koordinaci pro nouzov\u00e9, zdravotnick\u00e9 nebo kritick\u00e9 provozn\u00ed nap\u00e1jec\u00ed syst\u00e9my. Doporu\u010duje se tak\u00e9 pro jakoukoli aplikaci kritickou pro provoz, kde udr\u017eov\u00e1n\u00ed maxim\u00e1ln\u00ed kontinuity provozu b\u011bhem poruch poskytuje provozn\u00ed hodnotu, kter\u00e1 ospravedl\u0148uje 30-60% cenovou pr\u00e9mii.<sup>2<\/sup>Pr\u016fvodce koordinac\u00ed ATS a jisti\u010d\u016f: Vysv\u011btlen\u00ed Icw a selektivity<sup>2<\/sup> Pr\u016fmyslov\u00e1 instalace ATS 600 A s viditeln\u00fdmi kontakty a jisti\u010di proti proudu v elektrick\u00e9 rozvodn\u011b.<\/p>\n<p><strong>Technick\u00e9 srovn\u00e1n\u00ed jisti\u010d\u016f kategorie A a kategorie B zobrazuj\u00edc\u00ed vnit\u0159n\u00ed komponenty, charakteristiky vypnut\u00ed a jmenovit\u00e9 hodnoty Icw<\/strong><\/p>\n<p>Selektivn\u00ed koordinace znamen\u00e1, \u017ee p\u0159i poru\u0161e kdekoli v distribu\u010dn\u00edm syst\u00e9mu za p\u0159ep\u00edna\u010dem ATS (Automatic Transfer Switch) zas\u00e1hne pouze ochrann\u00e9 za\u0159\u00edzen\u00ed bezprost\u0159edn\u011b p\u0159ed poruchou \u2013 jisti\u010d p\u0159ed\u0159azen\u00fd p\u0159ep\u00edna\u010di ATS z\u016fstane sepnut\u00fd a zachov\u00e1 nap\u00e1jen\u00ed v\u0161ech z\u00e1t\u011b\u017e\u00ed krom\u011b porouchan\u00e9 v\u011btve. To vy\u017eaduje spr\u00e1vn\u00fd v\u00fdb\u011br typ\u016f jisti\u010d\u016f, jmenovit\u00fdch hodnot a nastaven\u00ed, koordinovan\u00fdch s odolnost\u00ed p\u0159ep\u00edna\u010de ATS proti zkratu. \u010cl\u00e1nek 700.28 normy NEC (National Electrical Code) na\u0159izuje selektivn\u00ed koordinaci pro nouzov\u00e9 syst\u00e9my, co\u017e \u010dasto vede k po\u017eadavku na jednotky ATS se jmenovitou zkratovou odolnost\u00ed po kr\u00e1tkou dobu.<\/p>\n<p><strong>Q6: Kdy je vy\u017eadov\u00e1n ATS se jmenovitou zkratovou odolnost\u00ed?<\/strong><\/p>\n<p>Detail sestavy kontakt\u016f jisti\u010de zobrazuj\u00edc\u00ed zh\u00e1\u0161en\u00ed oblouku a distribuci tepla.<\/p>\n<p><strong>Q7: Jak impedance zdroje gener\u00e1toru ovliv\u0148uje koordinaci ATS?<\/strong><\/p>\n<p>Zdroje gener\u00e1toru obvykle vykazuj\u00ed 4-10kr\u00e1t ni\u017e\u0161\u00ed poruchov\u00fd proud ne\u017e zdroje z rozvodn\u00e9 s\u00edt\u011b kv\u016fli subtransientn\u00ed reaktanci. To vytv\u00e1\u0159\u00ed dva odli\u0161n\u00e9 koordina\u010dn\u00ed sc\u00e9n\u00e1\u0159e, kter\u00e9 je nutn\u00e9 analyzovat samostatn\u011b \u2013 jeden pro poruchy ze s\u00edt\u011b (vy\u0161\u0161\u00ed proud, potenci\u00e1ln\u011b z\u00e1va\u017en\u011bj\u0161\u00ed) a jeden pro poruchy ze zdroje gener\u00e1toru (ni\u017e\u0161\u00ed proud, odli\u0161n\u00e9 po\u017eadavky na koordinaci). V\u00e1\u0161 ATS mus\u00ed b\u00fdt dimenzov\u00e1n na maxim\u00e1ln\u00ed poruchov\u00fd proud z obou zdroj\u016f a va\u0161e koordina\u010dn\u00ed studie mus\u00ed ov\u011b\u0159it selektivitu v obou sc\u00e9n\u00e1\u0159\u00edch. N\u011bkter\u00e9 instalace vy\u017eaduj\u00ed r\u016fzn\u00e1 nastaven\u00ed jisti\u010d\u016f nebo za\u0159\u00edzen\u00ed s du\u00e1ln\u00edm jmenovit\u00fdm proudem, aby se tato odli\u0161nost zohlednila.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 1456.2px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 1456.2px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: -31.5px; left: 54.0078px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: -31.5px; left: 54.0078px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 3111.38px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 3111.38px; left: 14px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Figure 1: A professional installation of a VIOX Automatic Transfer Switch illustrating the critical physical relationship between the ATS and upstream protection devices in a distribution environment. Why Most ATS Specifications Miss the Critical Coordination Factor When specifying an automatic transfer switch, most electrical engineers focus on the obvious parameters: continuous current rating, transfer time, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21257,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-21256","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/21256","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/comments?post=21256"}],"version-history":[{"count":2,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/21256\/revisions"}],"predecessor-version":[{"id":21259,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/21256\/revisions\/21259"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media\/21257"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media?parent=21256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/categories?post=21256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/tags?post=21256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}