{"id":21379,"date":"2026-01-21T00:11:17","date_gmt":"2026-01-20T16:11:17","guid":{"rendered":"https:\/\/viox.com\/?p=21379"},"modified":"2026-01-21T00:11:19","modified_gmt":"2026-01-20T16:11:19","slug":"mccb-trip-unit-settings-ir-isd-ii-explained","status":"publish","type":"post","link":"https:\/\/test.viox.com\/cs\/mccb-trip-unit-settings-ir-isd-ii-explained\/","title":{"rendered":"Vysv\u011btlen\u00ed nastaven\u00ed spou\u0161t\u011bc\u00ed jednotky MCCB: Ir, Im, Isd a Ii"},"content":{"rendered":"<div class=\"product-intro\">\n<h2>Pro\u010d z\u00e1le\u017e\u00ed na nastaven\u00ed spou\u0161t\u011bc\u00ed jednotky MCCB: Z\u00e1klad elektrick\u00e9 ochrany<\/h2>\n<p>Modern\u00ed syst\u00e9my elektrick\u00e9 distribuce vy\u017eaduj\u00ed p\u0159esnou a spolehlivou ochranu proti p\u0159et\u00ed\u017een\u00ed a zkrat\u016fm. J\u00e1drem t\u00e9to ochrany je <a href=\"https:\/\/test.viox.com\/cs\/what-is-a-molded-case-circuit-breaker-mccb\/\">lisovan\u00fd jisti\u010d (MCCB)<\/a> spou\u0161t\u011bc\u00ed jednotka \u2013 \u201cmozek\u201d, kter\u00fd ur\u010duje, kdy a jak rychle jisti\u010d reaguje na poruchov\u00e9 stavy. Na rozd\u00edl od miniaturn\u00edch jisti\u010d\u016f s pevn\u00fdm spou\u0161t\u011bn\u00edm, <a href=\"https:\/\/test.viox.com\/cs\/mccb\/\">MCCB<\/a> vybaven\u00e9 nastaviteln\u00fdmi spou\u0161t\u011bc\u00edmi jednotkami nab\u00edzej\u00ed in\u017een\u00fdr\u016fm flexibilitu p\u0159i p\u0159izp\u016fsobov\u00e1n\u00ed charakteristik ochrany specifick\u00fdm aplikac\u00edm, optimalizaci koordinace mezi ochrann\u00fdmi za\u0159\u00edzen\u00edmi a prevenci zbyte\u010dn\u00fdch prostoj\u016f zp\u016fsoben\u00fdch ru\u0161iv\u00fdm vyp\u00edn\u00e1n\u00edm.<\/p>\n<p>Pochopen\u00ed \u010dty\u0159 z\u00e1kladn\u00edch parametr\u016f spou\u0161t\u011bc\u00ed jednotky \u2013<strong>Ir<\/strong> (ochrana proti dlouhodob\u00e9mu p\u0159et\u00ed\u017een\u00ed), <strong>Im<\/strong> (ochrana proti kr\u00e1tkodob\u00e9mu p\u0159et\u00ed\u017een\u00ed), <strong>Isd<\/strong> (kr\u00e1tkodob\u00e9 vybaven\u00ed), a <strong>Ii<\/strong> (okam\u017eit\u00e1 ochrana) \u2013 je nezbytn\u00e9 pro ka\u017ed\u00e9ho, kdo se pod\u00edl\u00ed na n\u00e1vrhu elektrick\u00fdch syst\u00e9m\u016f, stavb\u011b rozvad\u011b\u010d\u016f nebo \u00fadr\u017eb\u011b za\u0159\u00edzen\u00ed. Nespr\u00e1vn\u00e9 nastaven\u00ed m\u016f\u017ee v\u00e9st k nedostate\u010dn\u00e9 ochran\u011b, selh\u00e1n\u00ed koordinace nebo \u010dast\u00e9mu fale\u0161n\u00e9mu vyp\u00edn\u00e1n\u00ed, kter\u00e9 naru\u0161uje provoz. Tato komplexn\u00ed p\u0159\u00edru\u010dka vysv\u011btluje ka\u017ed\u00fd parametr, poskytuje praktick\u00e9 metody v\u00fdpo\u010dtu a ukazuje, jak konfigurovat VIOX <a href=\"https:\/\/test.viox.com\/cs\/mccb\/\">spou\u0161t\u011bc\u00ed jednotky MCCB<\/a> pro optim\u00e1ln\u00ed v\u00fdkon a bezpe\u010dnost.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/VIOX-MCCB-Electronic-trip-unit-close-up.webp\" alt=\"VIOX electronic trip unit with adjustable Ir, Im, Isd, and Ii protection settings for MCCB\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 1: Detail elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky VIOX zobrazuj\u00edc\u00ed nastaviteln\u00e9 parametry Ir, Im, Isd a Ii.<\/figcaption><\/figure>\n<h2>Termomagnetick\u00e9 vs. Elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky: Pochopen\u00ed technologie<\/h2>\n<p>Ne\u017e se pono\u0159\u00edme do konkr\u00e9tn\u00edch parametr\u016f, je d\u016fle\u017eit\u00e9 pochopit dva hlavn\u00ed <a href=\"https:\/\/test.viox.com\/cs\/types-of-circuit-breakers\/\">typy jisti\u010d\u016f<\/a> spou\u0161t\u011bc\u00edch technologi\u00ed a jak se li\u0161\u00ed ve funk\u010dnosti a nastavitelnosti.<\/p>\n<h3>Tabulka 1: Srovn\u00e1n\u00ed termomagnetick\u00e9 a elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Funkce<\/th>\n<th>Termomagnetick\u00e1 spou\u0161t\u011bc\u00ed jednotka<\/th>\n<th>Elektronick\u00e1 spou\u0161t\u011bc\u00ed jednotka<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Princip fungov\u00e1n\u00ed<\/strong><\/td>\n<td>Bimetalov\u00fd p\u00e1sek (tepeln\u00fd) + elektromagnetick\u00e1 c\u00edvka (magnetick\u00e1)<\/td>\n<td>Proudov\u00e9 transform\u00e1tory (CT) + mikroprocesor<\/td>\n<\/tr>\n<tr>\n<td><strong>Nastaven\u00ed Ir<\/strong><\/td>\n<td>Omezen\u00e9 nebo pevn\u00e9 (typicky 0,7-1,0 \u00d7 In)<\/td>\n<td>\u0160irok\u00fd rozsah (typicky 0,4-1,0 \u00d7 In)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nastaven\u00ed Isd<\/strong><\/td>\n<td>Nen\u00ed k dispozici (kombinov\u00e1no s Ii)<\/td>\n<td>Pln\u011b nastaviteln\u00e9 (1,5-10 \u00d7 Ir)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nastaven\u00ed Ii<\/strong><\/td>\n<td>Pevn\u00fd nebo omezen\u00fd rozsah (typicky 5-10 \u00d7 In)<\/td>\n<td>\u0160irok\u00fd rozsah (2-15 \u00d7 Ir nebo vy\u0161\u0161\u00ed)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nastaven\u00ed \u010dasov\u00e9ho zpo\u017ed\u011bn\u00ed<\/strong><\/td>\n<td>Pevn\u00e1 inverzn\u00ed k\u0159ivka<\/td>\n<td>Nastaviteln\u00e9 tsd (typicky 0,05-0,5 s)<\/td>\n<\/tr>\n<tr>\n<td><strong>I\u00b2t Ochrana<\/strong><\/td>\n<td>Nen\u00ed k dispozici<\/td>\n<td>K dispozici u pokro\u010dil\u00fdch jednotek<\/td>\n<\/tr>\n<tr>\n<td><strong>P\u0159esnost<\/strong><\/td>\n<td>\u00b120% typicky<\/td>\n<td>\u00b15-10% typicky<\/td>\n<\/tr>\n<tr>\n<td><strong>Teplotn\u00ed citlivost<\/strong><\/td>\n<td>Ovlivn\u011bno okoln\u00ed teplotou<\/td>\n<td>Kompenzov\u00e1no elektronicky<\/td>\n<\/tr>\n<tr>\n<td><strong>Ochrana proti zemn\u00edmu spojen\u00ed<\/strong><\/td>\n<td>Vy\u017eaduje samostatn\u00fd modul<\/td>\n<td>\u010casto integrov\u00e1no (nastaven\u00ed Ig)<\/td>\n<\/tr>\n<tr>\n<td><strong>Displej\/Diagnostika<\/strong><\/td>\n<td>\u017d\u00e1dn\u00fd<\/td>\n<td>LCD displej, z\u00e1znam ud\u00e1lost\u00ed, komunikace<\/td>\n<\/tr>\n<tr>\n<td><strong>N\u00e1klady<\/strong><\/td>\n<td>Spodn\u00ed<\/td>\n<td>Vy\u0161\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>Typick\u00e9 aplikace<\/strong><\/td>\n<td>Jednoduch\u00e9 nap\u00e1je\u010de, pevn\u00e1 z\u00e1t\u011b\u017e<\/td>\n<td>Motory, gener\u00e1tory, komplexn\u00ed koordinace<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Kl\u00ed\u010dov\u00fd poznatek<\/strong>: Elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky poskytuj\u00ed mnohem v\u011bt\u0161\u00ed flexibilitu a p\u0159esnost, co\u017e je \u010din\u00ed nezbytn\u00fdmi pro aplikace vy\u017eaduj\u00edc\u00ed t\u011bsnou koordinaci, ochranu motor\u016f nebo integraci se syst\u00e9my spr\u00e1vy budov. VIOX nab\u00edz\u00ed ob\u011b technologie, p\u0159i\u010dem\u017e elektronick\u00e9 jednotky se doporu\u010duj\u00ed pro instalace vy\u017eaduj\u00edc\u00ed pokro\u010dil\u00e9 ochrann\u00e9 funkce.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/MCCB-cutaway-product-photography.webp\" alt=\"VIOX MCCB cutaway showing electronic trip unit components including current transformers and microprocessor\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 2: Vnit\u0159n\u00ed \u0159ez VIOX MCCB zd\u016fraz\u0148uj\u00edc\u00ed proudov\u00e9 transform\u00e1tory a spou\u0161t\u011bc\u00ed jednotku zalo\u017eenou na mikroprocesoru.<\/figcaption><\/figure>\n<h2>\u010cty\u0159i z\u00e1kladn\u00ed parametry ochrany: Ir, Im, Isd a Ii vysv\u011btleny<\/h2>\n<h3>Tabulka 2: Rychl\u00fd p\u0159ehled parametr\u016f spou\u0161t\u011bc\u00ed jednotky<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Parametr<\/th>\n<th>Cel\u00e9 jm\u00e9no<\/th>\n<th>Ochrann\u00e1 funkce<\/th>\n<th>Typick\u00fd rozsah<\/th>\n<th>\u010casov\u00e1 charakteristika<\/th>\n<th>Prim\u00e1rn\u00ed \u00fa\u010del<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Ir<\/strong><\/td>\n<td>Dlouhodob\u00fd vybavovac\u00ed proud<\/td>\n<td>Tepeln\u00e1\/P\u0159et\u011b\u017eovac\u00ed ochrana<\/td>\n<td>0,4-1,0 \u00d7 In<\/td>\n<td>Inverzn\u00ed \u010das (tr)<\/td>\n<td>Chr\u00e1n\u00ed vodi\u010de p\u0159ed trval\u00fdm p\u0159et\u00ed\u017een\u00edm<\/td>\n<\/tr>\n<tr>\n<td><strong>Im<\/strong><\/td>\n<td>Kr\u00e1tkodob\u00e1 ochrana<\/td>\n<td>N\/A (kombinov\u00e1no s Isd)<\/td>\n<td>NEUPLAT\u0147UJE SE<\/td>\n<td>NEUPLAT\u0147UJE SE<\/td>\n<td>Zastaral\u00fd term\u00edn, viz Isd<\/td>\n<\/tr>\n<tr>\n<td><strong>Isd<\/strong><\/td>\n<td>Kr\u00e1tkodob\u00fd vybavovac\u00ed proud<\/td>\n<td>Zpo\u017ed\u011bn\u00e1 zkratov\u00e1 ochrana<\/td>\n<td>1,5-10 \u00d7 Ir<\/td>\n<td>Definitivn\u00ed \u010das (tsd)<\/td>\n<td>Umo\u017e\u0148uje pod\u0159azen\u00fdm za\u0159\u00edzen\u00edm nejprve odstranit poruchy<\/td>\n<\/tr>\n<tr>\n<td><strong>Ii<\/strong><\/td>\n<td>Okam\u017eit\u00fd vybavovac\u00ed proud<\/td>\n<td>Okam\u017eit\u00e1 zkratov\u00e1 ochrana<\/td>\n<td>2-15 \u00d7 Ir (nebo vy\u0161\u0161\u00ed)<\/td>\n<td>\u017d\u00e1dn\u00e9 zpo\u017ed\u011bn\u00ed (&lt;0,05 s)<\/td>\n<td>Chr\u00e1n\u00ed proti z\u00e1va\u017en\u00fdm poruch\u00e1m<\/td>\n<\/tr>\n<tr>\n<td><strong>tr<\/strong><\/td>\n<td>Dlouhodob\u00e9 zpo\u017ed\u011bn\u00ed<\/td>\n<td>Doba vybaven\u00ed p\u0159i p\u0159et\u00ed\u017een\u00ed<\/td>\n<td>Pevn\u00e1 inverzn\u00ed k\u0159ivka<\/td>\n<td>Inverzn\u00ed (I\u00b2t)<\/td>\n<td>Odpov\u00edd\u00e1 tepeln\u00e9 kapacit\u011b vodi\u010de<\/td>\n<\/tr>\n<tr>\n<td><strong>tsd<\/strong><\/td>\n<td>Kr\u00e1tkodob\u00e9 zpo\u017ed\u011bn\u00ed<\/td>\n<td>Zpo\u017ed\u011bn\u00ed zkratu<\/td>\n<td>0,05-0,5 s<\/td>\n<td>Definitivn\u00ed \u010das<\/td>\n<td>Umo\u017e\u0148uje selektivn\u00ed koordinaci<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Pozn\u00e1mka k terminologii<\/strong>: Term\u00edn \u201cIm\u201d se ve star\u0161\u00ed literatu\u0159e n\u011bkdy pou\u017e\u00edv\u00e1 zam\u011bniteln\u011b s \u201cIsd\u201d, ale modern\u00ed normy IEC 60947-2 a UL 489 prim\u00e1rn\u011b odkazuj\u00ed na <strong>Isd<\/strong> pro kr\u00e1tkodob\u00e9 vybaven\u00ed a <strong>Ii<\/strong> pro okam\u017eit\u00e9 vybaven\u00ed. Tato p\u0159\u00edru\u010dka pou\u017e\u00edv\u00e1 aktu\u00e1ln\u00ed standardn\u00ed terminologii.<\/p>\n<h2>Ir (Dlouhodob\u00e1 ochrana): Nastaven\u00ed jmenovit\u00e9ho trval\u00e9ho proudu<\/h2>\n<p><strong>Ir<\/strong> p\u0159edstavuje jmenovit\u00fd trval\u00fd proud spou\u0161t\u011bc\u00ed jednotky \u2013 maxim\u00e1ln\u00ed proud, kter\u00fd jisti\u010d trvale snese bez vybaven\u00ed. Toto je nejz\u00e1kladn\u011bj\u0161\u00ed nastaven\u00ed a mus\u00ed b\u00fdt pe\u010dliv\u011b slad\u011bno s proudem z\u00e1t\u011b\u017ee a proudovou zat\u00ed\u017eitelnost\u00ed vodi\u010de.<\/p>\n<h3>Jak funguje Ir<\/h3>\n<p>Funkce dlouhodob\u00e9 ochrany pou\u017e\u00edv\u00e1 bimetalov\u00fd p\u00e1sek (termomagnetick\u00fd) nebo elektronick\u00e9 sn\u00edm\u00e1n\u00ed (elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky) ke sledov\u00e1n\u00ed proudu z\u00e1t\u011b\u017ee. Kdy\u017e proud p\u0159ekro\u010d\u00ed nastaven\u00ed Ir, za\u010dne inverzn\u00ed \u010dasov\u00e1 charakteristika: \u010d\u00edm vy\u0161\u0161\u00ed je p\u0159et\u00ed\u017een\u00ed, t\u00edm rychlej\u0161\u00ed je vybaven\u00ed. To napodobuje tepeln\u00e9 chov\u00e1n\u00ed vodi\u010d\u016f a p\u0159ipojen\u00fdch za\u0159\u00edzen\u00ed, poskytuje \u010das pro do\u010dasn\u00e1 p\u0159et\u00ed\u017een\u00ed (rozb\u011bh motoru, zap\u00ednac\u00ed proud transform\u00e1toru) a z\u00e1rove\u0148 chr\u00e1n\u00ed proti trval\u00fdm p\u0159et\u00ed\u017een\u00edm, kter\u00e1 by mohla po\u0161kodit izolaci.<\/p>\n<h3>V\u00fdpo\u010det Ir<\/h3>\n<p><strong>Z\u00e1kladn\u00ed vzorec:<\/strong><\/p>\n<pre style=\"background-color: #f4f4f4; padding: 10px; border-radius: 5px;\">Ir = Proud z\u00e1t\u011b\u017ee (IL) \u00f7 Koeficient zat\u00ed\u017een\u00ed<\/pre>\n<p><strong>Standardn\u00ed postup:<\/strong><\/p>\n<ul>\n<li>Pro trval\u00e9 z\u00e1t\u011b\u017ee: <code>Ir = IL \u00f7 0,8<\/code> (zat\u00ed\u017een\u00ed 80 % podle NEC\/IEC)<\/li>\n<li>Pro netrval\u00e9 z\u00e1t\u011b\u017ee: <code>Ir = IL \u00f7 0,9<\/code> (p\u0159\u00edpustn\u00e9 zat\u00ed\u017een\u00ed 90 %)<\/li>\n<\/ul>\n<p><strong>P\u0159\u00edklad:<\/strong><br \/>\nTrval\u00e1 z\u00e1t\u011b\u017e 100 A vy\u017eaduje: <code>Ir = 100 A \u00f7 0,8 = 125 A<\/code><\/p>\n<p>Pokud m\u00e1 v\u00e1\u0161 MCCB In = 160 A, nastavte oto\u010dn\u00fd ovlada\u010d Ir na: <code>125 A \u00f7 160 A = 0,78<\/code> (zaokrouhlete na nejbli\u017e\u0161\u00ed dostupn\u00e9 nastaven\u00ed, obvykle 0,8)<\/p>\n<h3>\u00davahy o nastaven\u00ed Ir<\/h3>\n<ol>\n<li><strong>Proudov\u00e1 zat\u00ed\u017eitelnost vodi\u010de<\/strong>: Ir nesm\u00ed p\u0159ekro\u010dit proudovou zat\u00ed\u017eitelnost nejmen\u0161\u00edho vodi\u010de v obvodu<\/li>\n<li><strong>Okoln\u00ed teplota<\/strong>: Elektronick\u00e9 spou\u0161t\u011bc\u00ed jednotky kompenzuj\u00ed automaticky; termomagnetick\u00e9 jednotky mohou vy\u017eadovat <a href=\"https:\/\/test.viox.com\/cs\/electrical-derating-temperature-altitude-grouping-factors\/\">sn\u00ed\u017een\u00ed jmenovit\u00e9ho proudu<\/a><\/li>\n<li><strong>Zat\u00ed\u017een\u00ed motoru<\/strong>: Zohledn\u011bte provozn\u00ed faktor a dobu trv\u00e1n\u00ed rozb\u011bhov\u00e9ho proudu<\/li>\n<li><strong>Budouc\u00ed roz\u0161\u00ed\u0159en\u00ed<\/strong>: N\u011bkte\u0159\u00ed in\u017een\u00fd\u0159i nastavuj\u00ed Ir m\u00edrn\u011b v\u00fd\u0161e, aby se p\u0159izp\u016fsobili r\u016fstu z\u00e1t\u011b\u017ee, ale to nesm\u00ed ohrozit ochranu vodi\u010de<\/li>\n<\/ol>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Time-current-curve-diagram.webp\" alt=\"Time-current curve diagram showing Ir, Im, Isd, and Ii protection zones for VIOX MCCB electronic trip unit\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 3: Technick\u00e1 \u010dasov\u011b-proudov\u00e1 k\u0159ivka ilustruj\u00edc\u00ed ochrann\u00e9 z\u00f3ny pro nastaven\u00ed Ir, Isd a Ii.<\/figcaption><\/figure>\n<h2>Isd (Kr\u00e1tkodob\u00e9 vybaven\u00ed): Koordinovan\u00e1 zkratov\u00e1 ochrana<\/h2>\n<p><strong>Isd<\/strong> definuje \u00farove\u0148 proudu, p\u0159i kter\u00e9 se aktivuje kr\u00e1tkodob\u00e1 ochrana. Na rozd\u00edl od okam\u017eit\u00e9 ochrany zahrnuje kr\u00e1tkodob\u00e1 ochrana z\u00e1m\u011brn\u00e9 zpo\u017ed\u011bn\u00ed (tsd), kter\u00e9 umo\u017e\u0148uje pod\u0159azen\u00fdm ochrann\u00fdm za\u0159\u00edzen\u00edm nejprve odstranit poruchy \u2013 podstata <a href=\"https:\/\/test.viox.com\/cs\/what-is-breaker-selectivity-coordination-guide\/\">selektivn\u00ed koordinace<\/a>.<\/p>\n<h3>Jak funguje Isd<\/h3>\n<p>Kdy\u017e poruchov\u00fd proud p\u0159ekro\u010d\u00ed prahovou hodnotu Isd, spou\u0161t\u011bc\u00ed jednotka spust\u00ed \u010dasova\u010d (tsd). Pokud porucha trv\u00e1 d\u00e9le ne\u017e zpo\u017ed\u011bn\u00ed tsd, jisti\u010d vybav\u00ed. Pokud pod\u0159azen\u00fd jisti\u010d odstran\u00ed poruchu p\u0159ed vypr\u0161en\u00edm tsd, nad\u0159azen\u00fd jisti\u010d z\u016fstane sepnut\u00fd, \u010d\u00edm\u017e se omez\u00ed v\u00fdpadek na poruchovou v\u011btev.<\/p>\n<h3>V\u00fdpo\u010det Isd<\/h3>\n<p><strong>Z\u00e1kladn\u00ed vzorec:<\/strong><\/p>\n<pre style=\"background-color: #f4f4f4; padding: 10px; border-radius: 5px;\">Isd = (1,5 a\u017e 10) \u00d7 Ir<\/pre>\n<p><strong>Krit\u00e9ria v\u00fdb\u011bru:<\/strong><\/p>\n<ul>\n<li><strong>Minim\u00e1ln\u00ed nastaven\u00ed<\/strong>: Mus\u00ed p\u0159ekro\u010dit maxim\u00e1ln\u00ed o\u010dek\u00e1van\u00e9 p\u0159echodn\u00e9 proudy (rozb\u011bh motoru, zap\u00ednac\u00ed proud transform\u00e1toru)<\/li>\n<li><strong>Maxim\u00e1ln\u00ed nastaven\u00ed<\/strong>: Mus\u00ed b\u00fdt pod dostupn\u00fdm poruchov\u00fdm proudem v m\u00edst\u011b jisti\u010de<\/li>\n<li><strong>Po\u017eadavek na koordinaci<\/strong>: Mus\u00ed b\u00fdt vy\u0161\u0161\u00ed ne\u017e nastaven\u00ed Ii pod\u0159azen\u00e9ho jisti\u010de<\/li>\n<\/ul>\n<p><strong>P\u0159\u00edklad:<\/strong><br \/>\nPro Ir = 400 A:<\/p>\n<ul>\n<li>Minim\u00e1ln\u00ed Isd: <code>1,5 \u00d7 400 A = 600 A<\/code> (zamezuje ne\u017e\u00e1douc\u00ed vyp\u00edn\u00e1n\u00ed zp\u016fsoben\u00e9 n\u00e1b\u011bhov\u00fdm proudem)<\/li>\n<li>Typick\u00e9 Isd: <code>6 \u00d7 400A = 2 400A<\/code> (b\u011b\u017en\u00e9 pro ochranu nap\u00e1je\u010de)<\/li>\n<li>Maxim\u00e1ln\u00ed Isd: Omezeno vyp\u00ednac\u00ed schopnost\u00ed jisti\u010de (Icu\/Ics) <a href=\"https:\/\/test.viox.com\/cs\/circuit-breaker-ratings-icu-ics-icw-icm\/\">Isd vs. Ii: Kdy kter\u00fd pou\u017e\u00edt<\/a><\/li>\n<\/ul>\n<h3>Pou\u017eijte Isd (s \u010dasovou prodlevou tsd)<\/h3>\n<ul>\n<li><strong>: Na hlavn\u00edch a nap\u00e1jec\u00edch jisti\u010d\u00edch, kde je vy\u017eadov\u00e1na selektivita s pod\u0159azen\u00fdmi za\u0159\u00edzen\u00edmi<\/strong>Pou\u017eijte Ii (bez prodlevy)<\/li>\n<li><strong>: Na koncov\u00fdch obvodech, kde je p\u0159ijateln\u00e9 okam\u017eit\u00e9 vypnut\u00ed a nen\u00ed pot\u0159eba koordinace s pod\u0159azen\u00fdmi za\u0159\u00edzen\u00edmi<\/strong>Deaktivujte Isd<\/li>\n<li><strong>: V n\u011bkter\u00fdch aplikac\u00edch je Isd nastaveno na \"OFF\" a pro jednoduchost se pou\u017e\u00edv\u00e1 pouze Ii<\/strong>Ii (Okam\u017eit\u00e1 ochrana): Okam\u017eit\u00e1 ochrana proti vysok\u00fdm poruchov\u00fdm proud\u016fm<\/li>\n<\/ul>\n<h2>zaji\u0161\u0165uje okam\u017eit\u00e9 vypnut\u00ed (typicky &lt;50 ms, \u010dasto &lt;20 ms), kdy\u017e poruchov\u00fd proud dos\u00e1hne extr\u00e9mn\u011b vysok\u00fdch \u00farovn\u00ed. Toto je posledn\u00ed linie obrany proti katastrof\u00e1ln\u00edm poruch\u00e1m, kter\u00e9 by mohly zp\u016fsobit oblouk, po\u017e\u00e1r nebo zni\u010den\u00ed za\u0159\u00edzen\u00ed.<\/h2>\n<p><strong>Ii<\/strong> Jak Ii funguje.<\/p>\n<h3>Kdy\u017e proud p\u0159ekro\u010d\u00ed prahovou hodnotu Ii, vyp\u00ednac\u00ed jednotka okam\u017eit\u011b vy\u0161le vyp\u00ednac\u00ed sign\u00e1l do mechanismu jisti\u010de bez \u00famysln\u00e9ho zpo\u017ed\u011bn\u00ed. Tato rychl\u00e1 odezva minimalizuje energii oblouku a omezuje po\u0161kozen\u00ed b\u011bhem z\u00e1va\u017en\u00fdch poruch, jako jsou zkraty s pevn\u00fdm spojen\u00edm.<\/h3>\n<p>V\u00fdpo\u010det Ii.<\/p>\n<h3>Ii \u2265 1,5 \u00d7 Isd<\/h3>\n<p><strong>Z\u00e1kladn\u00ed vzorec:<\/strong><\/p>\n<pre style=\"background-color: #f4f4f4; padding: 10px; border-radius: 5px;\">: Mus\u00ed b\u00fdt alespo\u0148 1,5\u00d7 vy\u0161\u0161\u00ed ne\u017e Isd, aby se zabr\u00e1nilo p\u0159ekr\u00fdv\u00e1n\u00ed<\/pre>\n<p><strong>Krit\u00e9ria v\u00fdb\u011bru:<\/strong><\/p>\n<ul>\n<li><strong>Minim\u00e1ln\u00ed nastaven\u00ed<\/strong>: Mus\u00ed p\u0159ekro\u010dit zablokovan\u00fd proud rotoru (typicky 8-12 \u00d7 FLA)<\/li>\n<li><strong>Aplikace motor\u016f<\/strong>: Mus\u00ed b\u00fdt ni\u017e\u0161\u00ed ne\u017e Isd nad\u0159azen\u00e9ho jisti\u010de, aby se zachovala selektivita<\/li>\n<li><strong>Koordinace<\/strong>: Mus\u00ed b\u00fdt pod potenci\u00e1ln\u00edm zkratov\u00fdm proudem v m\u00edst\u011b instalace<\/li>\n<li><strong>Dostupn\u00fd poruchov\u00fd proud<\/strong>Pro Isd = 2 400A:<\/li>\n<\/ul>\n<p><strong>P\u0159\u00edklad:<\/strong><br \/>\nMinim\u00e1ln\u00ed Ii:<\/p>\n<ul>\n<li>1,5 \u00d7 2 400A = 3 600A <code>Typick\u00e9 Ii:<\/code><\/li>\n<li>12 \u00d7 Ir = 12 \u00d7 400A = 4 800A <code>(b\u011b\u017en\u00e9 nastaven\u00ed)<\/code> Zvl\u00e1\u0161tn\u00ed aspekty pro Ii<\/li>\n<\/ul>\n<h3>N\u00e1b\u011bhov\u00fd proud transform\u00e1toru<\/h3>\n<ol>\n<li><strong>: Ii mus\u00ed p\u0159ekro\u010dit magnetiza\u010dn\u00ed n\u00e1b\u011bhov\u00fd proud (typicky 8-12\u00d7 jmenovit\u00fd proud po dobu 0,1 s)<\/strong>: Pro<\/li>\n<li><strong>Spou\u0161t\u011bn\u00ed motoru<\/strong>, Ii mus\u00ed p\u0159ekro\u010dit zablokovan\u00fd proud rotoru <a href=\"https:\/\/test.viox.com\/cs\/contactor-vs-motor-starter\/\">aplikace ochrany motoru<\/a>, Redukce obloukov\u00e9ho v\u00fdboje<\/li>\n<li><strong>: Ni\u017e\u0161\u00ed nastaven\u00ed Ii (tam, kde je to p\u0159\u00edpustn\u00e9) sni\u017euj\u00ed energii obloukov\u00e9ho v\u00fdboje<\/strong>: P\u0159\u00edli\u0161 n\u00edzk\u00e9 nastaven\u00ed Ii zp\u016fsobuje fale\u0161n\u00e9 vypnut\u00ed b\u011bhem norm\u00e1ln\u00edch sp\u00ednac\u00edch operac\u00ed<\/li>\n<li><strong>Nep\u0159\u00edjemn\u00e9 zakopnut\u00ed<\/strong>\u010casov\u00e9 prodlevy: Vysv\u011btlen\u00ed tr a tsd<\/li>\n<\/ol>\n<h2>tr (Dlouhodob\u00e1 prodleva)<\/h2>\n<h3>parametr definuje inverzn\u00ed \u010dasovou charakteristiku dlouhodob\u00e9 ochrany. Ve v\u011bt\u0161in\u011b elektronick\u00fdch vyp\u00ednac\u00edch jednotek nen\u00ed tr p\u0159\u00edmo nastaviteln\u00fd, ale sleduje standardizovanou k\u0159ivku I\u00b2t. K\u0159ivka zaji\u0161\u0165uje, \u017ee se doba vypnut\u00ed zkracuje s rostouc\u00ed velikost\u00ed p\u0159et\u00ed\u017een\u00ed:<\/h3>\n<p>Na str\u00e1nk\u00e1ch <strong>tr<\/strong> P\u0159i 1,05 \u00d7 Ir: \u017d\u00e1dn\u00e9 vypnut\u00ed (tolerance)<\/p>\n<ul>\n<li>P\u0159i 1,2 \u00d7 Ir: Vypnut\u00ed za &lt;2 hodiny (elektronick\u00e9) nebo &lt;1 hodinu (termomagnetick\u00e9)<\/li>\n<li>P\u0159i 6 \u00d7 Ir: Vypnut\u00ed v sekund\u00e1ch (p\u0159echod do z\u00f3ny zkratov\u00e9 ochrany)<\/li>\n<li>: K\u0159ivka tr je z v\u00fdroby kalibrov\u00e1na tak, aby odpov\u00eddala tepeln\u00fdm limit\u016fm vodi\u010de podle IEC 60947-2 a UL 489. In\u017een\u00fd\u0159i obvykle nenastavuj\u00ed tr p\u0159\u00edmo, ale vyb\u00edraj\u00ed jej v\u00fdb\u011brem vhodn\u00e9ho modelu vyp\u00ednac\u00ed jednotky.<\/li>\n<\/ul>\n<p><strong>Kl\u00ed\u010dov\u00fd bod<\/strong>tsd (Kr\u00e1tkodob\u00e1 prodleva).<\/p>\n<h3>parametr je pevn\u011b stanoven\u00e1 \u010dasov\u00e1 prodleva pro zkratovou ochranu. Mezi b\u011b\u017en\u00e1 nastaven\u00ed pat\u0159\u00ed:<\/h3>\n<p>Na str\u00e1nk\u00e1ch <strong>tsd<\/strong> 0,05 s<\/p>\n<ul>\n<li><strong>: Minim\u00e1ln\u00ed prodleva pro z\u00e1kladn\u00ed koordinaci<\/strong>: Standardn\u00ed nastaven\u00ed pro v\u011bt\u0161inu aplikac\u00ed<\/li>\n<li><strong>0.1s<\/strong>0,2 s<\/li>\n<li><strong>: Vylep\u0161en\u00e1 koordinace ve slo\u017eit\u00fdch syst\u00e9mech<\/strong>0,4 s<\/li>\n<li><strong>: Maxim\u00e1ln\u00ed prodleva pro hlubokou koordinaci (vy\u017eaduje vysokou jmenovitou hodnotu Icw)<\/strong>Pravidlo koordinace<\/li>\n<\/ul>\n<p><strong>: Nad\u0159azen\u00e9 tsd by m\u011blo b\u00fdt alespo\u0148 o 0,1-0,2 s del\u0161\u00ed ne\u017e celkov\u00e1 doba vypnut\u00ed pod\u0159azen\u00e9ho jisti\u010de, aby byla zaji\u0161t\u011bna selektivita.<\/strong>I\u00b2t ochrana: Tepeln\u00e1 pam\u011b\u0165 pro vylep\u0161enou koordinaci.<\/p>\n<h2>Pokro\u010dil\u00e9 elektronick\u00e9 vyp\u00ednac\u00ed jednotky zahrnuj\u00ed<\/h2>\n<p>I\u00b2t ochranu <strong>, kter\u00e1 zohled\u0148uje kumulativn\u00ed tepeln\u00fd \u00fa\u010dinek opakovan\u00fdch p\u0159et\u00ed\u017een\u00ed nebo poruch. Tato \"tepeln\u00e1 pam\u011b\u0165\" zabra\u0148uje ne\u017e\u00e1douc\u00edmu vyp\u00edn\u00e1n\u00ed zp\u016fsoben\u00e9mu kr\u00e1tk\u00fdmi, ne\u0161kodn\u00fdmi proudov\u00fdmi \u0161pi\u010dkami a z\u00e1rove\u0148 chr\u00e1n\u00ed p\u0159ed trval\u00fdm tepeln\u00fdm nam\u00e1h\u00e1n\u00edm.<\/strong>, Kdy povolit I\u00b2t:.<\/p>\n<p><strong>Motorov\u00e9 obvody s \u010dast\u00fdmi starty<\/strong><\/p>\n<ul>\n<li>Transform\u00e1torov\u00e9 obvody s opakovan\u00fdm n\u00e1b\u011bhov\u00fdm proudem<\/li>\n<li>Syst\u00e9my s vysok\u00fdm p\u0159echodn\u00fdm zat\u00ed\u017een\u00edm<\/li>\n<li>Koordinace s nad\u0159azen\u00fdmi pojistkami<\/li>\n<li>Coordination with upstream fuses<\/li>\n<\/ul>\n<p><strong>Kdy deaktivovat I\u00b2t:<\/strong><\/p>\n<ul>\n<li>Ochrana gener\u00e1toru (vy\u017eadov\u00e1na okam\u017eit\u00e1 reakce)<\/li>\n<li>Kritick\u00e9 z\u00e1t\u011b\u017ee, kde je jak\u00e9koli zpo\u017ed\u011bn\u00ed nep\u0159ijateln\u00e9<\/li>\n<li>Jednoduch\u00e9 radi\u00e1ln\u00ed syst\u00e9my bez slo\u017eit\u00fdch koordina\u010dn\u00edch pot\u0159eb<\/li>\n<\/ul>\n<h2>Praktick\u00e9 p\u0159\u00edklady nastaven\u00ed podle aplikace<\/h2>\n<h3>Tabulka 3: Typick\u00e9 nastaven\u00ed spou\u0161t\u011bc\u00ed jednotky podle aplikace<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Aplikace<\/th>\n<th>Proud z\u00e1t\u011b\u017ee (IL)<\/th>\n<th>Nastaven\u00ed Ir<\/th>\n<th>Nastaven\u00ed Isd<\/th>\n<th>Nastaven\u00ed Ii<\/th>\n<th>Nastaven\u00ed tsd<\/th>\n<th>Pozn\u00e1mky<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Hlavn\u00ed jisti\u010d (1600A)<\/strong><\/td>\n<td>1280A<\/td>\n<td>1.0 \u00d7 In = 1600A<\/td>\n<td>10 \u00d7 Ir = 16 000A<\/td>\n<td>15 \u00d7 Ir = 24 000A<\/td>\n<td>: Maxim\u00e1ln\u00ed prodleva pro hlubokou koordinaci (vy\u017eaduje vysokou jmenovitou hodnotu Icw)<\/td>\n<td>Maxim\u00e1ln\u00ed selektivita s v\u00fdvody<\/td>\n<\/tr>\n<tr>\n<td><strong>V\u00fdvod (400A)<\/strong><\/td>\n<td>320A<\/td>\n<td>0.8 \u00d7 In = 320A<\/td>\n<td>6 \u00d7 Ir = 1 920A<\/td>\n<td>12 \u00d7 Ir = 3 840A<\/td>\n<td>: Vylep\u0161en\u00e1 koordinace ve slo\u017eit\u00fdch syst\u00e9mech<\/td>\n<td>Koordinace s hlavn\u00edm jisti\u010dem a odbo\u010dkami<\/td>\n<\/tr>\n<tr>\n<td><strong>Motorov\u00e1 odbo\u010dka (100A)<\/strong><\/td>\n<td>75A FLA<\/td>\n<td>0.9 \u00d7 In = 90A<\/td>\n<td>8 \u00d7 Ir = 720A<\/td>\n<td>12 \u00d7 Ir = 1 080A<\/td>\n<td>VYPNUTO (pouze Ii)<\/td>\n<td>P\u0159izp\u016fsobeno 6\u00d7 LRA<\/td>\n<\/tr>\n<tr>\n<td><strong>Osv\u011btlen\u00ed\/Z\u00e1suvka (63A)<\/strong><\/td>\n<td>50A<\/td>\n<td>0.8 \u00d7 In = 50A<\/td>\n<td>OFF<\/td>\n<td>10 \u00d7 Ir = 500A<\/td>\n<td>NEUPLAT\u0147UJE SE<\/td>\n<td>Jednoduch\u00e1 ochrana, nen\u00ed pot\u0159eba koordinace<\/td>\n<\/tr>\n<tr>\n<td><strong>Prim\u00e1r transform\u00e1toru (250A)<\/strong><\/td>\n<td>200A<\/td>\n<td>0.8 \u00d7 In = 200A<\/td>\n<td>10 \u00d7 Ir = 2 000A<\/td>\n<td>12 \u00d7 Ir = 2 400A<\/td>\n<td>0.1s<\/td>\n<td>Odol\u00e1v\u00e1 10\u00d7 n\u00e1b\u011bhov\u00e9mu proudu po dobu 0,1 s<\/td>\n<\/tr>\n<tr>\n<td><strong>Gener\u00e1tor (800A)<\/strong><\/td>\n<td>640A<\/td>\n<td>0.8 \u00d7 In = 640A<\/td>\n<td>3 \u00d7 Ir = 1 920A<\/td>\n<td>6 \u00d7 Ir = 3 840A<\/td>\n<td>: Minim\u00e1ln\u00ed prodleva pro z\u00e1kladn\u00ed koordinaci<\/td>\n<td>Rychl\u00e9 vypnut\u00ed pro ochranu altern\u00e1toru<\/td>\n<\/tr>\n<tr>\n<td><strong>V\u00fdstup UPS (160A)<\/strong><\/td>\n<td>128A<\/td>\n<td>0.8 \u00d7 In = 128A<\/td>\n<td>OFF<\/td>\n<td>8 \u00d7 Ir = 1 024A<\/td>\n<td>NEUPLAT\u0147UJE SE<\/td>\n<td>Pouze okam\u017eit\u00e9, \u017e\u00e1dn\u00e9 po\u0161kozen\u00ed baterie<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Selectivity-coordination-schematic.webp\" alt=\"Selectivity coordination diagram showing proper VIOX MCCB trip unit settings for three-level distribution system\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 4: Sch\u00e9ma zn\u00e1zor\u0148uj\u00edc\u00ed selektivn\u00ed koordinaci a spr\u00e1vn\u00e9 nastaven\u00ed spou\u0161t\u011bc\u00edch charakteristik hlavn\u00edch jisti\u010d\u016f, v\u00fdvod\u016f a odbo\u010dek.<\/figcaption><\/figure>\n<h2>P\u0159\u00edklady v\u00fdpo\u010dtu nastaven\u00ed krok za krokem<\/h2>\n<h3>Tabulka 4: P\u0159\u00edklady v\u00fdpo\u010dtu nastaven\u00ed<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Krok<\/th>\n<th>P\u0159\u00edklad 1: V\u00fdvod 400A<\/th>\n<th>P\u0159\u00edklad 2: Motorov\u00e1 odbo\u010dka 100A<\/th>\n<th>P\u0159\u00edklad 3: Hlavn\u00ed jisti\u010d 1600A<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>1. Ur\u010den\u00ed z\u00e1t\u011b\u017ee<\/strong><\/td>\n<td>320A trval\u00e1 z\u00e1t\u011b\u017e<\/td>\n<td>75A motor (FLA), 450A LRA<\/td>\n<td>1280A celkov\u00e1 z\u00e1t\u011b\u017e<\/td>\n<\/tr>\n<tr>\n<td><strong>2. V\u00fdpo\u010det Ir<\/strong><\/td>\n<td>320A \u00f7 0.8 = 400A<br \/>\nNastavte Ir = 1.0 \u00d7 400A = 400A<\/td>\n<td>75A \u00f7 0.9 = 83A<br \/>\nZaokrouhlete nahoru na r\u00e1mec 100A<br \/>\nNastavte Ir = 0,9 \u00d7 100A = 90A<\/td>\n<td>1280A \u00f7 0,8 = 1600A<br \/>\nNastavte Ir = 1,0 \u00d7 1600A = 1600A<\/td>\n<\/tr>\n<tr>\n<td><strong>3. Vypo\u010dt\u011bte Isd<\/strong><\/td>\n<td>Je nutn\u00e1 koordinace se 100A v\u011btvemi<br \/>\nNastavte Isd = 6 \u00d7 400A = 2 400A<\/td>\n<td>Rozb\u011bh motoru: 450A LRA<br \/>\nNastavte Isd = 8 \u00d7 90A = 720A<br \/>\n(P\u0159ekra\u010duje 450A LRA)<\/td>\n<td>Koordinujte s 400A p\u0159\u00edvody<br \/>\nNastavte Isd = 10 \u00d7 1600A = 16 000A<\/td>\n<\/tr>\n<tr>\n<td><strong>4. Vypo\u010dt\u011bte Ii<\/strong><\/td>\n<td>Mus\u00ed p\u0159ekro\u010dit Isd o 1,5\u00d7<br \/>\nNastavte Ii = 12 \u00d7 400A = 4 800A<br \/>\n(2\u00d7 Isd, dobr\u00e1 rezerva)<\/td>\n<td>Mus\u00ed p\u0159ekro\u010dit LRA<br \/>\nNastavte Ii = 12 \u00d7 90A = 1 080A<br \/>\n(2,4\u00d7 LRA, dosta\u010duj\u00edc\u00ed)<\/td>\n<td>Mus\u00ed p\u0159ekro\u010dit Ii p\u0159\u00edvodu<br \/>\nNastavte Ii = 15 \u00d7 1600A = 24 000A<br \/>\n(5\u00d7 Ii p\u0159\u00edvodu)<\/td>\n<\/tr>\n<tr>\n<td><strong>5. Nastavte \u010dasov\u00e9 zpo\u017ed\u011bn\u00ed<\/strong><\/td>\n<td>tsd = 0,2 s<br \/>\n(Umo\u017e\u0148uje 100A v\u011btv\u00edm vypnut\u00ed za 0,1 s)<\/td>\n<td>tsd = VYPNUTO<br \/>\n(Pro jednoduchost pou\u017eijte pouze Ii)<\/td>\n<td>tsd = 0,4 s<br \/>\n(Maxim\u00e1ln\u00ed selektivita)<\/td>\n<\/tr>\n<tr>\n<td><strong>6. Ov\u011b\u0159te koordinaci<\/strong><\/td>\n<td>\u2713 Isd (2 400A) &gt; Ii v\u011btve (1 080A)<br \/>\n\u2713 tsd (0,2 s) &gt; Doba vypnut\u00ed v\u011btve<\/td>\n<td>\u2713 Ii (1 080A) &lt; Isd p\u0159\u00edvodu (2 400A)<br \/>\n\u2713 Nen\u00ed nutn\u00e1 koordinace s nad\u0159azen\u00fdm za\u0159\u00edzen\u00edm<\/td>\n<td>\u2713 Isd (16 000A) &gt; Ii p\u0159\u00edvodu (4 800A)<br \/>\n\u2713 tsd (0,4 s) &gt; tsd p\u0159\u00edvodu + 0,2 s<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Setting-flowchart---Decision-tree-for-configuring-trip-unit-parameters-with-calculation-boxes-and-consideration-factors.webp\" alt=\"Step-by-step flowchart for configuring VIOX MCCB trip unit settings (Ir, Isd, Ii) based on load requirements\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 5: V\u00fdvojov\u00fd diagram rozhodovac\u00edho stromu, kter\u00fd vede konfigurac\u00ed parametr\u016f spou\u0161t\u011bc\u00ed jednotky.<\/figcaption><\/figure>\n<h2>Selektivita a koordinace: Kritick\u00fd vztah<\/h2>\n<p>Spr\u00e1vn\u00e1 koordinace mezi nad\u0159azen\u00fdmi a pod\u0159azen\u00fdmi ochrann\u00fdmi za\u0159\u00edzen\u00edmi je z\u00e1sadn\u00ed pro minimalizaci rozsahu v\u00fdpadku b\u011bhem poruch. C\u00edl: pouze jisti\u010d nejbl\u00ed\u017ee poru\u0161e by m\u011bl vypnout, p\u0159i\u010dem\u017e zbytek syst\u00e9mu z\u016fstane pod nap\u011bt\u00edm.<\/p>\n<h3>Tabulka 5: Pravidla selektivn\u00ed koordinace<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Po\u017eadavek na koordinaci<\/th>\n<th>Pravidlo<\/th>\n<th>P\u0159\u00edklad<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Nad\u0159azen\u00e9 Ir vs. Pod\u0159azen\u00e9 Ir<\/strong><\/td>\n<td>Nad\u0159azen\u00e9 Ir \u2265 2\u00d7 Pod\u0159azen\u00e9 Ir<\/td>\n<td>Hlavn\u00ed 1600A, P\u0159\u00edvod 400A (pom\u011br 4\u00d7)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nad\u0159azen\u00e9 Isd vs. Pod\u0159azen\u00e9 Ii<\/strong><\/td>\n<td>Nad\u0159azen\u00e9 Isd &gt; Pod\u0159azen\u00e9 Ii<\/td>\n<td>Hlavn\u00ed Isd 16 000A &gt; P\u0159\u00edvod Ii 4 800A<\/td>\n<\/tr>\n<tr>\n<td><strong>Nad\u0159azen\u00e9 tsd vs. Doba vypnut\u00ed pod\u0159azen\u00e9ho za\u0159\u00edzen\u00ed<\/strong><\/td>\n<td>Nad\u0159azen\u00e9 tsd \u2265 Celkov\u00e1 doba vypnut\u00ed pod\u0159azen\u00e9ho za\u0159\u00edzen\u00ed + 0,1-0,2 s<\/td>\n<td>Hlavn\u00ed tsd 0,4 s &gt; P\u0159\u00edvod (0,2 s + 0,1 s vypnut\u00ed)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nad\u0159azen\u00e9 Ii vs. Pod\u0159azen\u00e9 Ii<\/strong><\/td>\n<td>Nad\u0159azen\u00e9 Ii \u2265 2\u00d7 Pod\u0159azen\u00e9 Ii<\/td>\n<td>Hlavn\u00ed Ii 24 000A &gt; P\u0159\u00edvod Ii 4 800A (pom\u011br 5\u00d7)<\/td>\n<\/tr>\n<tr>\n<td><strong>I\u00b2t Koordinace<\/strong><\/td>\n<td>Nad\u0159azen\u00e9 I\u00b2t &gt; Pod\u0159azen\u00e9 I\u00b2t<\/td>\n<td>Hlavn\u00ed I\u00b2t ZAPNUTO, P\u0159\u00edvod I\u00b2t ZAPNUTO nebo VYPNUTO<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Kl\u00ed\u010dov\u00fd princip koordinace<\/strong>: Ka\u017ed\u00e9 nad\u0159azen\u00e9 za\u0159\u00edzen\u00ed mus\u00ed m\u00edt vy\u0161\u0161\u00ed nastaven\u00ed vybavovac\u00edho proudu a del\u0161\u00ed \u010dasov\u00e9 zpo\u017ed\u011bn\u00ed ne\u017e pod\u0159azen\u00e9 za\u0159\u00edzen\u00ed, kter\u00e9 chr\u00e1n\u00ed. To vytv\u00e1\u0159\u00ed \u201ckask\u00e1du\u201d ochrany, kde nejprve vypne nejmen\u0161\u00ed jisti\u010d, pot\u00e9 dal\u0161\u00ed v\u011bt\u0161\u00ed a tak d\u00e1le.<\/p>\n<p><strong>Pokro\u010dil\u00e1 koordinace<\/strong>: Pro slo\u017eit\u00e9 syst\u00e9my pou\u017eijte software pro anal\u00fdzu \u010dasov\u011b-proudov\u00fdch charakteristik (mnoho v\u00fdrobc\u016f poskytuje bezplatn\u00e9 n\u00e1stroje) k ov\u011b\u0159en\u00ed koordinace ve v\u0161ech \u00farovn\u00edch poruchov\u00e9ho proudu. Technick\u00e1 podpora VIOX v\u00e1m m\u016f\u017ee pomoci s <a href=\"https:\/\/test.viox.com\/cs\/circuit-protection-selection-framework-a-5-step-guide-for-panel-builders-iec-60947\/\">v\u00fdb\u011brem ochrany obvod\u016f<\/a> a studiemi koordinace.<\/p>\n<h2>B\u011b\u017en\u00e9 chyby v nastaven\u00ed a \u0159e\u0161en\u00ed<\/h2>\n<h3>Tabulka 6: B\u011b\u017en\u00e9 chyby v nastaven\u00ed a \u0159e\u0161en\u00ed<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Chyba<\/th>\n<th>N\u00e1sledek<\/th>\n<th>Spr\u00e1vn\u00fd postup<\/th>\n<th>Prevence<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Ir nastaven p\u0159\u00edli\u0161 vysoko<\/strong><\/td>\n<td>P\u0159eh\u0159\u00edv\u00e1n\u00ed vodi\u010de, po\u0161kozen\u00ed izolace<\/td>\n<td>Vypo\u010dt\u011bte Ir na z\u00e1klad\u011b proudov\u00e9 zat\u00ed\u017eitelnosti vodi\u010de, nikoli velikosti r\u00e1mu jisti\u010de<\/td>\n<td>V\u017edy ov\u011b\u0159te, zda Ir \u2264 proudov\u00e9 zat\u00ed\u017eitelnosti vodi\u010de<\/td>\n<\/tr>\n<tr>\n<td><strong>Ir nastaven p\u0159\u00edli\u0161 n\u00edzko<\/strong><\/td>\n<td>Nep\u0159\u00edjemn\u00e9 vyp\u00edn\u00e1n\u00ed p\u0159i b\u011b\u017en\u00e9m provozu<\/td>\n<td>Zohledn\u011bte trval\u00e9 zat\u00ed\u017een\u00ed + bezpe\u010dnostn\u00ed rezervu (pravidlo 80%)<\/td>\n<td>P\u0159ed nastaven\u00edm zm\u011b\u0159te skute\u010dn\u00fd proud z\u00e1t\u011b\u017ee<\/td>\n<\/tr>\n<tr>\n<td><strong>Isd = Ii (\u017e\u00e1dn\u00e9 odd\u011blen\u00ed)<\/strong><\/td>\n<td>Ztr\u00e1ta selektivity, ob\u011b funkce vypnou sou\u010dasn\u011b<\/td>\n<td>Zajist\u011bte, aby Ii \u2265 1,5 \u00d7 Isd<\/td>\n<td>Pou\u017e\u00edvejte doporu\u010den\u00e9 pom\u011bry v\u00fdrobce<\/td>\n<\/tr>\n<tr>\n<td><strong>tsd p\u0159\u00edli\u0161 kr\u00e1tk\u00e9<\/strong><\/td>\n<td>Nad\u0159azen\u00fd jisti\u010d vypne d\u0159\u00edve, ne\u017e pod\u0159azen\u00fd odstran\u00ed poruchu<\/td>\n<td>P\u0159idejte 0,1-0,2 s rezervu k dob\u011b vypnut\u00ed pod\u0159azen\u00e9ho jisti\u010de<\/td>\n<td>Vypo\u010dt\u011bte celkovou dobu vypnut\u00ed v\u010detn\u011b doby trv\u00e1n\u00ed oblouku<\/td>\n<\/tr>\n<tr>\n<td><strong>tsd p\u0159\u00edli\u0161 dlouh\u00e9<\/strong><\/td>\n<td>Nadm\u011brn\u00e1 doba trv\u00e1n\u00ed poruchov\u00e9ho proudu, po\u0161kozen\u00ed za\u0159\u00edzen\u00ed<\/td>\n<td>Vyva\u017ete pot\u0159eby koordinace s odolnost\u00ed za\u0159\u00edzen\u00ed<\/td>\n<td>Ov\u011b\u0159te, zda jmenovit\u00e1 hodnota Icw jisti\u010de podporuje dobu trv\u00e1n\u00ed tsd<\/td>\n<\/tr>\n<tr>\n<td><strong>Ii nastaveno pod LRA motoru<\/strong><\/td>\n<td>Jisti\u010d vypne p\u0159i spou\u0161t\u011bn\u00ed motoru<\/td>\n<td>Nastavte Ii \u2265 1,2 \u00d7 proud p\u0159i zablokovan\u00e9m rotoru<\/td>\n<td>P\u0159ed nastaven\u00edm z\u00edskejte \u00fadaje ze \u0161t\u00edtku motoru<\/td>\n<\/tr>\n<tr>\n<td><strong>Ignorov\u00e1n\u00ed I\u00b2t<\/strong><\/td>\n<td>P\u0159ed\u010dasn\u00e9 vyp\u00edn\u00e1n\u00ed v d\u016fsledku ne\u0161kodn\u00fdch p\u0159echodn\u00fdch jev\u016f<\/td>\n<td>Povolte I\u00b2t pro z\u00e1t\u011b\u017ee s \u010dast\u00fdmi n\u00e1b\u011bhov\u00fdmi proudy<\/td>\n<td>Pochopte charakteristiky z\u00e1t\u011b\u017ee<\/td>\n<\/tr>\n<tr>\n<td><strong>\u017d\u00e1dn\u00e1 studie koordinace<\/strong><\/td>\n<td>N\u00e1hodn\u00e9 vzorce vyp\u00edn\u00e1n\u00ed, velk\u00e9 v\u00fdpadky<\/td>\n<td>Prove\u010fte anal\u00fdzu \u010dasov\u011b-proudov\u00e9 charakteristiky<\/td>\n<td>Pou\u017eijte software pro koordinaci nebo se pora\u010fte s v\u00fdrobcem<\/td>\n<\/tr>\n<tr>\n<td><strong>Zapom\u00edn\u00e1n\u00ed okoln\u00ed teploty<\/strong><\/td>\n<td>Termomagnetick\u00e9 jednotky vyp\u00ednaj\u00ed d\u0159\u00edve v hork\u00e9m prost\u0159ed\u00ed<\/td>\n<td>Pou\u017eijte reduk\u010dn\u00ed faktory nebo pou\u017eijte elektronick\u00e9 vyp\u00ednac\u00ed jednotky<\/td>\n<td>Zm\u011b\u0159te skute\u010dnou teplotu uvnit\u0159 panelu<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Profesion\u00e1ln\u00ed tip<\/strong>: Dokumentujte v\u0161echna nastaven\u00ed vyp\u00ednac\u00ed jednotky na sch\u00e9matech panelu a udr\u017eujte datab\u00e1zi nastaven\u00ed. Mnoho elektronick\u00fdch vyp\u00ednac\u00edch jednotek umo\u017e\u0148uje nahr\u00e1v\u00e1n\u00ed\/stahov\u00e1n\u00ed nastaven\u00ed pomoc\u00ed softwaru, co\u017e usnad\u0148uje uv\u00e1d\u011bn\u00ed do provozu a odstra\u0148ov\u00e1n\u00ed probl\u00e9m\u016f.<\/p>\n<h2>Odstra\u0148ov\u00e1n\u00ed probl\u00e9m\u016f s vyp\u00ednac\u00ed jednotkou<\/h2>\n<ul>\n<li><strong>P\u0159\u00edznak: \u010cast\u00e9 ru\u0161iv\u00e9 vyp\u00edn\u00e1n\u00ed<\/strong>\n<ul>\n<li>Zkontrolujte, zda je Ir nastaven p\u0159\u00edli\u0161 n\u00edzko pro skute\u010dn\u00e9 zat\u00ed\u017een\u00ed<\/li>\n<li>Ov\u011b\u0159te, zda Ii nen\u00ed pod spou\u0161t\u011bc\u00edmi proudy motoru nebo n\u00e1b\u011bhov\u00fdmi proudy transform\u00e1toru<\/li>\n<li>Potvr\u010fte, \u017ee okoln\u00ed teplota je v mez\u00edch jmenovit\u00e9 hodnoty jisti\u010de<\/li>\n<li>Zkontrolujte uvoln\u011bn\u00e9 spoje, kter\u00e9 zp\u016fsobuj\u00ed pokles nap\u011bt\u00ed a proudov\u00e9 \u0161pi\u010dky<\/li>\n<\/ul>\n<\/li>\n<li><strong>P\u0159\u00edznak: Jisti\u010d nevypne b\u011bhem p\u0159et\u00ed\u017een\u00ed<\/strong>\n<ul>\n<li>Ov\u011b\u0159te, zda nastaven\u00ed Ir odpov\u00edd\u00e1 po\u017eadavk\u016fm na zat\u00ed\u017een\u00ed<\/li>\n<li>Zkontrolujte, zda je termomagnetick\u00e1 jednotka teplotn\u011b kompenzov\u00e1na<\/li>\n<li>Otestujte funk\u010dnost vyp\u00ednac\u00ed jednotky podle postup\u016f v\u00fdrobce<\/li>\n<li>Potvr\u010fte, \u017ee jisti\u010d nedos\u00e1hl konce elektrick\u00e9 \u017eivotnosti<\/li>\n<\/ul>\n<\/li>\n<li><strong>P\u0159\u00edznak: Ztr\u00e1ta selektivity (vypne nespr\u00e1vn\u00fd jisti\u010d)<\/strong>\n<ul>\n<li>Zkontrolujte studii koordinace \u2013 nad\u0159azen\u00fd Isd m\u016f\u017ee b\u00fdt p\u0159\u00edli\u0161 n\u00edzk\u00fd<\/li>\n<li>Ov\u011b\u0159te, zda nastaven\u00ed tsd poskytuj\u00ed dostate\u010dnou \u010dasovou rezervu<\/li>\n<li>Zkontrolujte, zda Ii pod\u0159azen\u00e9ho jisti\u010de nep\u0159ekra\u010duje Isd nad\u0159azen\u00e9ho jisti\u010de<\/li>\n<li>Potvr\u010fte, \u017ee \u00farovn\u011b poruchov\u00e9ho proudu odpov\u00eddaj\u00ed konstruk\u010dn\u00edm p\u0159edpoklad\u016fm<\/li>\n<\/ul>\n<\/li>\n<li><strong>P\u0159\u00edznak: Nelze nastavit po\u017eadovanou hodnotu Ir<\/strong>\n<ul>\n<li>Zkontrolujte, zda z\u00e1suvn\u00fd modul (je-li j\u00edm vybaven) omezuje rozsah nastaven\u00ed<\/li>\n<li>Ov\u011b\u0159te, zda model vyp\u00ednac\u00ed jednotky podporuje po\u017eadovan\u00fd rozsah Ir<\/li>\n<li>Zva\u017ete zm\u011bnu na jinou velikost r\u00e1mu nebo model vyp\u00ednac\u00ed jednotky<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>V p\u0159\u00edpad\u011b p\u0159etrv\u00e1vaj\u00edc\u00edch probl\u00e9m\u016f m\u016f\u017ee technick\u00e1 podpora VIOX poskytnout vzd\u00e1lenou diagnostiku pro elektronick\u00e9 vyp\u00ednac\u00ed jednotky s komunika\u010dn\u00edmi schopnostmi nebo v\u00e1s prov\u00e9st systematick\u00fdmi testovac\u00edmi postupy.<\/p>\n<h2>Integrace s modern\u00edmi syst\u00e9my<\/h2>\n<p>Pokro\u010dil\u00e9 elektronick\u00e9 vyp\u00ednac\u00ed jednotky VIOX nab\u00edzej\u00ed funkce nad r\u00e1mec z\u00e1kladn\u00ed ochrany LSI:<\/p>\n<ul>\n<li><strong>Komunika\u010dn\u00ed protokoly<\/strong>: Modbus RTU, Profibus, Ethernet pro integraci se SCADA\/BMS<\/li>\n<li><strong>Z\u00e1znam ud\u00e1lost\u00ed<\/strong>: Zaznamen\u00e1v\u00e1 ud\u00e1losti vypnut\u00ed, profily zat\u00ed\u017een\u00ed a alarmov\u00e9 stavy<\/li>\n<li><strong>Prediktivn\u00ed \u00fadr\u017eba<\/strong>: Monitoruje opot\u0159eben\u00ed kontakt\u016f, po\u010det operac\u00ed a tepeln\u00e9 nam\u00e1h\u00e1n\u00ed<\/li>\n<li><strong>Vzd\u00e1len\u00e9 nastaven\u00ed<\/strong>: Upravte parametry pomoc\u00ed softwaru bez otev\u00edr\u00e1n\u00ed panelu<\/li>\n<li><strong>Ochrana proti zemn\u00edmu spojen\u00ed<\/strong>: Integrovan\u00e9 nastaven\u00ed Ig pro ochranu osob a za\u0159\u00edzen\u00ed<\/li>\n<li><strong>: Ni\u017e\u0161\u00ed nastaven\u00ed Ii (tam, kde je to p\u0159\u00edpustn\u00e9) sni\u017euj\u00ed energii obloukov\u00e9ho v\u00fdboje<\/strong>: Re\u017eim \u00fadr\u017eby do\u010dasn\u011b sni\u017euje Ii, aby se sn\u00ed\u017eila energie oblouku<\/li>\n<\/ul>\n<p>Tyto funkce jsou obzvl\u00e1\u0161t\u011b cenn\u00e9 v <a href=\"https:\/\/test.viox.com\/cs\/commercial-ev-charging-protection-guide-acb-mccb-rcbo\/\">komer\u010dn\u00edm nab\u00edjen\u00ed EV<\/a>, datov\u00fdch centrech a kritick\u00e9 infrastruktu\u0159e, kde jsou n\u00e1klady na prostoje vysok\u00e9 a proaktivn\u00ed \u00fadr\u017eba je nezbytn\u00e1.<\/p>\n<h2>FAQ: Nastaven\u00ed spou\u0161t\u011bc\u00ed jednotky MCCB<\/h2>\n<p><strong>Ot\u00e1zka: Co znamen\u00e1 Ir na spou\u0161t\u011bc\u00ed jednotce MCCB?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Ir znamen\u00e1 \u201cproud dlouhodob\u00e9ho vybaven\u00ed\u201d nebo \u201cnastaven\u00ed jmenovit\u00e9ho proudu\u201d. P\u0159edstavuje trval\u00fd proud, kter\u00fd jisti\u010d p\u0159enese bez vypnut\u00ed, a obvykle je nastaviteln\u00fd od 0,4 do 1,0 n\u00e1sobku jmenovit\u00e9ho proudu jisti\u010de (In). Nap\u0159\u00edklad, pokud m\u00e1te jisti\u010d 400 A (In = 400 A) a nastav\u00edte Ir na 0,8, efektivn\u00ed trval\u00fd proud se stane 320 A. Ir chr\u00e1n\u00ed proti trval\u00e9mu p\u0159et\u00ed\u017een\u00ed pomoc\u00ed inverzn\u00ed \u010dasov\u00e9 charakteristiky \u2013 \u010d\u00edm vy\u0161\u0161\u00ed je p\u0159et\u00ed\u017een\u00ed, t\u00edm rychlej\u0161\u00ed je vypnut\u00ed.<\/p>\n<p><strong>Ot\u00e1zka: Jak vypo\u010d\u00edt\u00e1m spr\u00e1vn\u00e9 nastaven\u00ed Ir pro moji z\u00e1t\u011b\u017e?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Pou\u017eijte vzorec: <strong>Ir = Proud z\u00e1t\u011b\u017ee \u00f7 0,8<\/strong> (pro trval\u00e9 zat\u00ed\u017een\u00ed podle pravidla NEC\/IEC 80%). Nap\u0159\u00edklad trval\u00e9 zat\u00ed\u017een\u00ed 100 A vy\u017eaduje Ir = 100 A \u00f7 0,8 = 125 A. Pokud m\u00e1 v\u00e1\u0161 jisti\u010d In = 160 A, nastavte oto\u010dn\u00fd ovlada\u010d Ir na 125 A \u00f7 160 A = 0,78 (zaokrouhlete na 0,8, pokud je to nejbli\u017e\u0161\u00ed nastaven\u00ed). V\u017edy ov\u011b\u0159te, \u017ee Ir nep\u0159ekra\u010duje proudovou zat\u00ed\u017eitelnost nejmen\u0161\u00edho vodi\u010de v obvodu, a zohledn\u011bte <a href=\"https:\/\/test.viox.com\/cs\/mcb-ambient-temperature-ratings-and-derating-factors\/\">sn\u00ed\u017een\u00ed jmenovit\u00e9ho v\u00fdkonu v z\u00e1vislosti na teplot\u011b okol\u00ed<\/a> v p\u0159\u00edpad\u011b pot\u0159eby.<\/p>\n<p><strong>Ot\u00e1zka: Jak\u00fd je rozd\u00edl mezi Isd a Ii?<\/strong><\/p>\n<p>A: <strong>Isd<\/strong> (zkratov\u00fd vybavovac\u00ed proud) a <strong>Ii<\/strong> (okam\u017eit\u00fd vybavovac\u00ed proud) chr\u00e1n\u00ed proti zkrat\u016fm, ale s r\u016fzn\u00fdmi dobami odezvy. Isd zahrnuje z\u00e1m\u011brn\u00e9 \u010dasov\u00e9 zpo\u017ed\u011bn\u00ed (tsd, obvykle 0,05-0,4 s), aby se umo\u017enilo nejd\u0159\u00edve vypnut\u00ed zkratu jisti\u010d\u016fm um\u00edst\u011bn\u00fdm n\u00ed\u017ee, co\u017e umo\u017e\u0148uje selektivitu. Ii poskytuje okam\u017eit\u00e9 vypnut\u00ed (&lt;50 ms) bez zpo\u017ed\u011bn\u00ed pro z\u00e1va\u017en\u00e9 poruchy. P\u0159edstavte si Isd jako \u201ckoordinovanou ochranu\u201d a Ii jako \u201cochranu posledn\u00ed instance\u201d. Ve spr\u00e1vn\u011b koordinovan\u00e9m syst\u00e9mu by m\u011bl b\u00fdt Ii nastaven alespo\u0148 1,5\u00d7 v\u00fd\u0161e ne\u017e Isd, aby se zabr\u00e1nilo p\u0159ekr\u00fdv\u00e1n\u00ed.<\/p>\n<p><strong>Ot\u00e1zka: Pro\u010d pot\u0159ebuji zkratov\u00e9 zpo\u017ed\u011bn\u00ed (tsd) nam\u00edsto okam\u017eit\u00e9ho vypnut\u00ed?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Zkratov\u00e9 zpo\u017ed\u011bn\u00ed umo\u017e\u0148uje <strong>selektivitu<\/strong>\u2014schopnost izolovat pouze poruchov\u00fd obvod a z\u00e1rove\u0148 udr\u017eet zbytek syst\u00e9mu pod nap\u011bt\u00edm. Bez tsd by porucha kdekoli v syst\u00e9mu mohla vypnout hlavn\u00ed jisti\u010d, co\u017e by zp\u016fsobilo \u00fapln\u00fd v\u00fdpadek proudu. P\u0159id\u00e1n\u00edm zpo\u017ed\u011bn\u00ed 0,1-0,4 s k jisti\u010d\u016fm um\u00edst\u011bn\u00fdm v\u00fd\u0161e d\u00e1te jisti\u010d\u016fm um\u00edst\u011bn\u00fdm n\u00ed\u017ee \u010das na to, aby nejd\u0159\u00edve vypnuly poruchy. T\u00edm se minimalizuje rozsah v\u00fdpadku a zvy\u0161uje se spolehlivost syst\u00e9mu. Tsd v\u0161ak vy\u017eaduje, aby jisti\u010d vydr\u017eel poruchov\u00fd proud po dobu zpo\u017ed\u011bn\u00ed (zkontrolujte jmenovitou hodnotu Icw).<\/p>\n<p><strong>Ot\u00e1zka: Mohu nastavit Ii n\u00ed\u017ee ne\u017e Isd?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Ne, to je \u010dast\u00e1 chyba, kter\u00e1 ma\u0159\u00ed \u00fa\u010del m\u00edt dv\u011b samostatn\u00e9 ochrann\u00e9 z\u00f3ny. <strong>Ii mus\u00ed b\u00fdt v\u017edy vy\u0161\u0161\u00ed ne\u017e Isd<\/strong> (obvykle 1,5-2\u00d7 vy\u0161\u0161\u00ed), aby se zachovala spr\u00e1vn\u00e1 koordinace. Pokud Ii \u2264 Isd, ob\u011b funkce by se aktivovaly sou\u010dasn\u011b b\u011bhem poruchy, \u010d\u00edm\u017e by se eliminovala v\u00fdhoda \u010dasov\u011b zpo\u017ed\u011bn\u00e9 zkratov\u00e9 ochrany. V\u011bt\u0161ina modern\u00edch spou\u0161t\u011bc\u00edch jednotek zabra\u0148uje t\u00e9to chyb\u011b automatick\u00fdm nastaven\u00edm Ii, pokud se jej pokus\u00edte nastavit pod Isd, ale po nastaven\u00ed v\u017edy ov\u011b\u0159te sv\u00e1 nastaven\u00ed.<\/p>\n<p><strong>Ot\u00e1zka: Co je ochrana I\u00b2t a kdy bych ji m\u011bl pou\u017e\u00edt?<\/strong><\/p>\n<p>A: <strong>, kter\u00e1 zohled\u0148uje kumulativn\u00ed tepeln\u00fd \u00fa\u010dinek opakovan\u00fdch p\u0159et\u00ed\u017een\u00ed nebo poruch. Tato \"tepeln\u00e1 pam\u011b\u0165\" zabra\u0148uje ne\u017e\u00e1douc\u00edmu vyp\u00edn\u00e1n\u00ed zp\u016fsoben\u00e9mu kr\u00e1tk\u00fdmi, ne\u0161kodn\u00fdmi proudov\u00fdmi \u0161pi\u010dkami a z\u00e1rove\u0148 chr\u00e1n\u00ed p\u0159ed trval\u00fdm tepeln\u00fdm nam\u00e1h\u00e1n\u00edm.<\/strong> (tak\u00e9 naz\u00fdvan\u00e1 \u201ctepeln\u00e1 pam\u011b\u0165\u201d) zohled\u0148uje kumulativn\u00ed topn\u00fd \u00fa\u010dinek proudu v pr\u016fb\u011bhu \u010dasu. Zabra\u0148uje ru\u0161iv\u00e9mu vyp\u00edn\u00e1n\u00ed z kr\u00e1tk\u00fdch, ne\u0161kodn\u00fdch proudov\u00fdch \u0161pi\u010dek (spou\u0161t\u011bn\u00ed motoru, zap\u00ednac\u00ed proud transform\u00e1toru) a z\u00e1rove\u0148 chr\u00e1n\u00ed proti trval\u00e9mu tepeln\u00e9mu nam\u00e1h\u00e1n\u00ed. Povolte I\u00b2t pro: motorov\u00e9 obvody s \u010dast\u00fdm spou\u0161t\u011bn\u00edm, prim\u00e1rn\u00ed vinut\u00ed transform\u00e1tor\u016f nebo jakoukoli z\u00e1t\u011b\u017e s opakuj\u00edc\u00edmi se vysok\u00fdmi zap\u00ednac\u00edmi proudy. Zaka\u017ete I\u00b2t pro: ochranu gener\u00e1toru (kde je kritick\u00e1 okam\u017eit\u00e1 odezva), jednoduch\u00e9 radi\u00e1ln\u00ed syst\u00e9my nebo aplikace, kde je jak\u00e9koli zpo\u017ed\u011bn\u00ed nep\u0159ijateln\u00e9. I\u00b2t je zvl\u00e1\u0161t\u011b u\u017eite\u010dn\u00e9 pro dosa\u017een\u00ed koordinace s pojistkami um\u00edst\u011bn\u00fdmi v\u00fd\u0161e.<\/p>\n<p><strong>Ot\u00e1zka: Jak koordinuji nastaven\u00ed vypnut\u00ed mezi jisti\u010di um\u00edst\u011bn\u00fdmi v\u00fd\u0161e a n\u00ed\u017ee?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Dodr\u017eujte tato pravidla: (1) <strong>Nad\u0159azen\u00e9 Ir \u2265 2\u00d7 Pod\u0159azen\u00e9 Ir<\/strong> pro zvl\u00e1dnut\u00ed kombinovan\u00e9ho zat\u00ed\u017een\u00ed; (2) <strong>Nad\u0159azen\u00e9 Isd &gt; Pod\u0159azen\u00e9 Ii<\/strong> aby se okam\u017eit\u00e1 ochrana jisti\u010de um\u00edst\u011bn\u00e9ho n\u00ed\u017ee nep\u0159ekr\u00fdvala se zkratovou ochranou um\u00edst\u011bnou v\u00fd\u0161e; (3) <strong>Tsd um\u00edst\u011bn\u00fd v\u00fd\u0161e \u2265 Celkov\u00e1 doba vypnut\u00ed um\u00edst\u011bn\u00e9ho n\u00ed\u017ee + rezerva 0,1-0,2 s<\/strong> aby se zajistilo, \u017ee jisti\u010d um\u00edst\u011bn\u00fd n\u00ed\u017ee vypne jako prvn\u00ed; (4) <strong>Nad\u0159azen\u00e9 Ii \u2265 2\u00d7 Pod\u0159azen\u00e9 Ii<\/strong> pro kone\u010dnou z\u00e1lohu. Pou\u017eijte software pro anal\u00fdzu \u010dasov\u011b-proudov\u00e9 charakteristiky k ov\u011b\u0159en\u00ed koordinace nap\u0159\u00ed\u010d v\u0161emi \u00farovn\u011bmi poruch. VIOX poskytuje bezplatnou pomoc s koordinac\u00ed \u2013 kontaktujte n\u00e1\u0161 technick\u00fd t\u00fdm s va\u0161\u00edm jednop\u00f3lov\u00fdm sch\u00e9matem syst\u00e9mu.<\/p>\n<h2>Kl\u00ed\u010dov\u00e9 poznatky<\/h2>\n<ul>\n<li><strong>Ir (dlouhodob\u00e1 ochrana)<\/strong> nastavuje jmenovit\u00fd trval\u00fd proud a mus\u00ed b\u00fdt vypo\u010d\u00edt\u00e1n na z\u00e1klad\u011b skute\u010dn\u00e9ho proudu z\u00e1t\u011b\u017ee d\u011blen\u00e9ho 0,8 (pravidlo zat\u00ed\u017een\u00ed 80%), nikdy nesm\u00ed p\u0159ekro\u010dit proudovou zat\u00ed\u017eitelnost vodi\u010de.<\/li>\n<li><strong>Isd (zkratov\u00fd vybavovac\u00ed proud)<\/strong> umo\u017e\u0148uje selektivitu p\u0159id\u00e1n\u00edm z\u00e1m\u011brn\u00e9ho zpo\u017ed\u011bn\u00ed (tsd) p\u0159ed vypnut\u00edm, co\u017e umo\u017e\u0148uje jisti\u010d\u016fm um\u00edst\u011bn\u00fdm n\u00ed\u017ee, aby nejd\u0159\u00edve vypnuly poruchy \u2013 z\u00e1sadn\u00ed pro minimalizaci rozsahu v\u00fdpadku v koordinovan\u00fdch syst\u00e9mech.<\/li>\n<li><strong>Ii (okam\u017eit\u00e1 ochrana)<\/strong> poskytuje okam\u017eit\u00e9 vypnut\u00ed pro z\u00e1va\u017en\u00e9 poruchy a mus\u00ed b\u00fdt nastaven alespo\u0148 1,5\u00d7 v\u00fd\u0161e ne\u017e Isd, aby se zachovalo spr\u00e1vn\u00e9 odd\u011blen\u00ed mezi ochrann\u00fdmi z\u00f3nami.<\/li>\n<li><strong>Elektronick\u00e9 spou\u0161\u0165ov\u00e9 jednotky<\/strong> nab\u00edzej\u00ed mnohem v\u011bt\u0161\u00ed flexibilitu a p\u0159esnost ne\u017e termomagnetick\u00e9 jednotky, s nastaviteln\u00fdmi rozsahy Ir (0,4-1,0 \u00d7 In), Isd (1,5-10 \u00d7 Ir) a Ii (2-15 \u00d7 Ir) plus pokro\u010dil\u00e9 funkce, jako je ochrana I\u00b2t a komunikace.<\/li>\n<li><strong>Koordinace vy\u017eaduje systematick\u00e9 pl\u00e1nov\u00e1n\u00ed<\/strong>: jisti\u010de um\u00edst\u011bn\u00e9 v\u00fd\u0161e mus\u00ed m\u00edt vy\u0161\u0161\u00ed nastaven\u00ed vybaven\u00ed a del\u0161\u00ed \u010dasov\u00e1 zpo\u017ed\u011bn\u00ed ne\u017e za\u0159\u00edzen\u00ed um\u00edst\u011bn\u00e1 n\u00ed\u017ee, podle pravidel Isd um\u00edst\u011bn\u00fd v\u00fd\u0161e &gt; Ii um\u00edst\u011bn\u00fd n\u00ed\u017ee a Tsd um\u00edst\u011bn\u00fd v\u00fd\u0161e \u2265 Doba vypnut\u00ed um\u00edst\u011bn\u00e9ho n\u00ed\u017ee + rezerva.<\/li>\n<li><strong>, kter\u00e1 zohled\u0148uje kumulativn\u00ed tepeln\u00fd \u00fa\u010dinek opakovan\u00fdch p\u0159et\u00ed\u017een\u00ed nebo poruch. Tato \"tepeln\u00e1 pam\u011b\u0165\" zabra\u0148uje ne\u017e\u00e1douc\u00edmu vyp\u00edn\u00e1n\u00ed zp\u016fsoben\u00e9mu kr\u00e1tk\u00fdmi, ne\u0161kodn\u00fdmi proudov\u00fdmi \u0161pi\u010dkami a z\u00e1rove\u0148 chr\u00e1n\u00ed p\u0159ed trval\u00fdm tepeln\u00fdm nam\u00e1h\u00e1n\u00edm.<\/strong> (tepeln\u00e1 pam\u011b\u0165) zabra\u0148uje ru\u0161iv\u00e9mu vyp\u00edn\u00e1n\u00ed z kr\u00e1tk\u00fdch zap\u00ednac\u00edch proud\u016f a z\u00e1rove\u0148 udr\u017euje ochranu proti trval\u00e9mu p\u0159et\u00ed\u017een\u00ed \u2013 povolte pro motorov\u00e9 a transform\u00e1torov\u00e9 aplikace, zaka\u017ete pro gener\u00e1tory a jednoduch\u00e9 syst\u00e9my.<\/li>\n<li><strong>B\u011b\u017en\u00e9 chyby<\/strong> zahrnuj\u00ed nastaven\u00ed p\u0159\u00edli\u0161 vysok\u00e9ho Ir (riziko po\u0161kozen\u00ed vodi\u010de), nastaven\u00ed Ii \u2264 Isd (ztr\u00e1ta selektivity) a ignorov\u00e1n\u00ed spou\u0161t\u011bc\u00edch proud\u016f motoru (zp\u016fsoben\u00ed ru\u0161iv\u00e9ho vyp\u00edn\u00e1n\u00ed) \u2013 v\u017edy ov\u011b\u0159te nastaven\u00ed podle charakteristik z\u00e1t\u011b\u017ee a po\u017eadavk\u016f na koordinaci.<\/li>\n<li><strong>Anal\u00fdza \u010dasov\u011b-proudov\u00e9 charakteristiky<\/strong> je nezbytn\u00e1 pro slo\u017eit\u00e9 syst\u00e9my \u2013 pou\u017eijte software poskytovan\u00fd v\u00fdrobcem nebo se pora\u010fte s technickou podporou VIOX, abyste ov\u011b\u0159ili koordinaci nap\u0159\u00ed\u010d v\u0161emi \u00farovn\u011bmi poruchov\u00e9ho proudu a zajistili spr\u00e1vnou selektivitu.<\/li>\n<li><strong>Dokumentace a testov\u00e1n\u00ed<\/strong> jsou kritick\u00e9: zaznamenejte v\u0161echna nastaven\u00ed spou\u0161t\u011bc\u00ed jednotky do sch\u00e9mat panelu, prove\u010fte testy uveden\u00ed do provozu, abyste ov\u011b\u0159ili provoz, a udr\u017eujte datab\u00e1zi nastaven\u00ed pro budouc\u00ed odstra\u0148ov\u00e1n\u00ed probl\u00e9m\u016f a \u00fapravy.<\/li>\n<\/ul>\n<p>Pro spolehlivou a p\u0159esn\u011b nakonfigurovanou ochranu obvod\u016f prozkoumejte kompletn\u00ed \u0159adu VIOX <a href=\"https:\/\/test.viox.com\/cs\/mccb\/\">MCCB s pokro\u010dil\u00fdmi elektronick\u00fdmi spou\u0161t\u011bc\u00edmi jednotkami<\/a>. N\u00e1\u0161 in\u017een\u00fdrsk\u00fd t\u00fdm poskytuje komplexn\u00ed podporu pro v\u00fdb\u011br spou\u0161t\u011bc\u00ed jednotky, studie koordinace a pomoc p\u0159i uv\u00e1d\u011bn\u00ed do provozu, aby zajistil bezpe\u010dn\u00fd a efektivn\u00ed provoz va\u0161eho elektrick\u00e9ho rozvodn\u00e9ho syst\u00e9mu. Kontaktujte n\u00e1s pro aplika\u010dn\u011b specifick\u00e9 pokyny k optimalizaci nastaven\u00ed Ir, Isd a Ii pro va\u0161e jedine\u010dn\u00e9 po\u017eadavky.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Why MCCB Trip Unit Settings Matter: The Foundation of Electrical Protection Modern electrical distribution systems demand precise, reliable protection against overloads and short circuits. At the heart of this protection lies the molded case circuit breaker (MCCB) trip unit\u2014the &#8220;brain&#8221; that determines when and how quickly a breaker responds to fault conditions. Unlike fixed-trip miniature [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21380,"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-21379","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\/21379","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=21379"}],"version-history":[{"count":1,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/21379\/revisions"}],"predecessor-version":[{"id":21381,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/21379\/revisions\/21381"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media\/21380"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media?parent=21379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/categories?post=21379"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/tags?post=21379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}