{"id":15201,"date":"2025-04-08T20:15:10","date_gmt":"2025-04-08T12:15:10","guid":{"rendered":"https:\/\/viox.com\/?p=15201"},"modified":"2026-04-02T11:29:23","modified_gmt":"2026-04-02T03:29:23","slug":"dc-isolator-vs-dc-circuit-breaker-complete-comparison-guide","status":"publish","type":"post","link":"https:\/\/test.viox.com\/cs\/dc-isolator-vs-dc-circuit-breaker-complete-comparison-guide\/","title":{"rendered":"DC Odpojova\u010d vs. DC Jisti\u010d v Sol\u00e1rn\u00edch Kombin\u00e1torov\u00fdch Sk\u0159\u00edn\u00edch: R\u016fzn\u00e9 \u00dakoly, R\u016fzn\u00e1 Rizika"},"content":{"rendered":"<div class=\"product-intro\">\n<figure style=\"text-align: center; margin: 20px 0;\">\n        <img decoding=\"async\" src=\"https:\/\/img.viox.com\/Inside-a-solar-combiner-box-showing-DC-breakers-and-an-output-side-DC-isolator.webp\" alt=\"Inside a solar combiner box showing DC breakers and an output-side DC isolator\" style=\"max-width: 100%; height: auto;\"><figcaption style=\"margin-top: 8px; color: #555;\"><i>Uvnit\u0159 sol\u00e1rn\u00ed slu\u010dovac\u00ed sk\u0159\u00edn\u011b: Jasn\u00fd vnit\u0159n\u00ed pohled ukazuj\u00edc\u00ed DC jisti\u010de pou\u017e\u00edvan\u00e9 pro ochranu string\u016f a hlavn\u00ed DC izol\u00e1tor na v\u00fdstupn\u00ed stran\u011b pro manu\u00e1ln\u00ed odpojen\u00ed.<\/i><\/figcaption><\/figure>\n<p>Uvnit\u0159 ka\u017ed\u00e9 sol\u00e1rn\u00ed slu\u010dovac\u00ed sk\u0159\u00edn\u011b se opakovan\u011b objevuj\u00ed dva typy DC sp\u00ednac\u00edch za\u0159\u00edzen\u00ed, kter\u00e9 nejsou standardn\u011b zam\u011bniteln\u00e9. A <strong>DC odpojova\u010d<\/strong> je tam hlavn\u011b proto, aby poskytoval manu\u00e1ln\u00ed, z\u00e1m\u011brnou izolaci, aby mohl technik bezpe\u010dn\u011b prov\u00e1d\u011bt servis syst\u00e9mu. A <strong>DC jisti\u010d<\/strong> je tam hlavn\u011b proto, aby detekoval nadproudov\u00e9 nebo zkratov\u00e9 stavy a automaticky p\u0159eru\u0161il obvod.<\/p>\n<p>\u0158e\u0161\u00ed r\u016fzn\u00e1 rizika. Sed\u00ed v r\u016fzn\u00fdch \u010d\u00e1stech ochrann\u00e9 hierarchie. A kdy\u017e n\u00e1vrh\u00e1\u0159i rozmaz\u00e1vaj\u00ed hranici mezi nimi, v\u00fdsledkem obvykle nen\u00ed mal\u00fd probl\u00e9m s pap\u00edrov\u00e1n\u00edm. Projevuje se to jako obt\u011b\u017euj\u00edc\u00ed vyp\u00edn\u00e1n\u00ed, slab\u00e1 ochrana proti poruch\u00e1m, neohraban\u00e9 postupy \u00fadr\u017eby nebo trval\u00fd DC oblouk uvnit\u0159 krytu.<\/p>\n<p>Tato p\u0159\u00edru\u010dka vysv\u011btluje, kam ka\u017ed\u00e9 za\u0159\u00edzen\u00ed pat\u0159\u00ed v PV slu\u010dovac\u00ed sk\u0159\u00edni, pro\u010d mnoho sk\u0159\u00edn\u00ed pot\u0159ebuje oboj\u00ed <strong>funkce<\/strong>, a kter\u00e9 chyby p\u0159i v\u00fdb\u011bru se st\u00e1le objevuj\u00ed na re\u00e1ln\u00fdch projektech.<\/p>\n<p>Pokud chcete nejprve \u0161ir\u0161\u00ed kontext krytu, za\u010dn\u011bte s <a href=\"https:\/\/test.viox.com\/cs\/combiner-box\/\">str\u00e1nkou produktu slu\u010dovac\u00ed sk\u0159\u00edn\u011b<\/a> nebo vysv\u011btlen\u00edm na <a href=\"https:\/\/test.viox.com\/cs\/what-does-a-solar-combiner-box-do\/\">co d\u011bl\u00e1 sol\u00e1rn\u00ed slu\u010dovac\u00ed sk\u0159\u00ed\u0148<\/a>. Tento \u010dl\u00e1nek se zam\u011b\u0159uje na hranici rol\u00ed za\u0159\u00edzen\u00ed uvnit\u0159 sk\u0159\u00edn\u011b.<\/p>\n<h2>P\u0159\u00edm\u00e1 odpov\u011b\u010f<\/h2>\n<p>A <strong>DC odpojova\u010d<\/strong> je pro <strong>manu\u00e1ln\u00ed izolaci a bezpe\u010dn\u00e9 odpojen\u00ed<\/strong>. A <strong>DC jisti\u010d<\/strong> je pro <strong>automatick\u00e9 p\u0159eru\u0161en\u00ed nadproudu<\/strong>.<\/p>\n<p>V PV slu\u010dovac\u00edch sk\u0159\u00edn\u00edch to obvykle znamen\u00e1:<\/p>\n<ul>\n<li>hlavn\u00ed <strong>funkce izol\u00e1toru<\/strong> podporuje \u00fadr\u017ebu, uzam\u010den\u00ed a m\u00edstn\u00ed odpojen\u00ed<\/li>\n<li>hlavn\u00ed <strong>funkci jisti\u010de<\/strong> podporuje ochranu string\u016f nebo nap\u00e1je\u010d\u016f v p\u0159\u00edpad\u011b poruchy<\/li>\n<\/ul>\n<p>Jedno za\u0159\u00edzen\u00ed m\u016f\u017ee n\u011bkdy spl\u0148ovat v\u00edce ne\u017e jeden po\u017eadavek, pokud to jeho seznam, ozna\u010den\u00ed a aplikace umo\u017e\u0148uj\u00ed. N\u00e1vrh\u00e1\u0159i by ale nem\u011bli vych\u00e1zet z p\u0159edpokladu, \u017ee jisti\u010d automaticky nahrazuje izol\u00e1tor, nebo \u017ee izol\u00e1tor n\u011bjak\u00fdm zp\u016fsobem nahrazuje nadproudovou ochranu.<\/p>\n<h2>Z\u00e1kladn\u00ed srovn\u00e1n\u00ed: DC izol\u00e1tor vs. DC jisti\u010d ve slu\u010dovac\u00ed sk\u0159\u00edni<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\">\n        <img decoding=\"async\" src=\"https:\/\/img.viox.com\/Technical-infographic-comparing-DC-isolators-and-DC-circuit-breakers-in-solar-combiner-boxes.webp\" alt=\"Technical infographic comparing DC isolators and DC circuit breakers in solar combiner boxes\" style=\"max-width: 100%; height: auto;\"><figcaption style=\"margin-top: 8px; color: #555;\"><i>Technick\u00e9 srovn\u00e1n\u00ed: Podrobn\u00fd rozbor atribut\u016f kontrastuj\u00edc\u00edch DC izol\u00e1tory (odp\u00edna\u010de) a DC jisti\u010de (DC-MCB) v aplikac\u00edch PV slu\u010dovac\u00edch sk\u0159\u00edn\u00ed.<\/i><\/figcaption><\/figure>\n<table border=\"1\" style=\"border-collapse: collapse; width: 100%; text-align: left;\">\n<thead>\n<tr>\n<th style=\"padding: 10px;\">Funkce<\/th>\n<th style=\"padding: 10px;\">Izol\u00e1tor stejnosm\u011brn\u00e9ho proudu<\/th>\n<th style=\"padding: 10px;\">Jisti\u010d stejnosm\u011brn\u00e9ho proudu<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px;\"><strong>Prim\u00e1rn\u00ed role<\/strong><\/td>\n<td style=\"padding: 10px;\">Manu\u00e1ln\u00ed odpojen\u00ed a izola\u010dn\u00ed \u00fadr\u017eba<\/td>\n<td style=\"padding: 10px;\">Automatick\u00e1 ochrana proti nadproudu a zkratu<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px;\"><strong>Manu\u00e1ln\u00ed izolace<\/strong><\/td>\n<td style=\"padding: 10px;\">Ano, to je hlavn\u00ed \u00fa\u010del<\/td>\n<td style=\"padding: 10px;\">N\u011bkdy mo\u017en\u00e9, ale obvykle to nen\u00ed prvn\u00ed d\u016fvod, pro\u010d je specifikov\u00e1n<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px;\"><strong>Nadproudov\u00e1 ochrana<\/strong><\/td>\n<td style=\"padding: 10px;\">\u017d\u00e1dn\u00fd<\/td>\n<td style=\"padding: 10px;\">Ano<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px;\"><strong>Indikace izolace<\/strong><\/td>\n<td style=\"padding: 10px;\">Obvykle poskytuje jasnou, z\u00e1m\u011brnou sp\u00ednac\u00ed polohu a uzamykateln\u00fd servisn\u00ed stav<\/td>\n<td style=\"padding: 10px;\">Poloha rukojeti ne v\u017edy poskytuje stejnou jistotu \u00fadr\u017eby jako vyhrazen\u00fd izol\u00e1tor<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px;\"><strong>Schopnost p\u0159eru\u0161en\u00ed z\u00e1t\u011b\u017ee<\/strong><\/td>\n<td style=\"padding: 10px;\">Z\u00e1le\u017e\u00ed na jmenovit\u00e9 hodnot\u011b odp\u00edna\u010de a PV DC zat\u00ed\u017een\u00ed<\/td>\n<td style=\"padding: 10px;\">Z\u00e1le\u017e\u00ed na konstrukci jisti\u010de, DC jmenovit\u00e9 hodnot\u011b a p\u0159eru\u0161ovac\u00ed schopnosti<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px;\"><strong>Typick\u00e9 um\u00edst\u011bn\u00ed ve slu\u010dovac\u00ed sk\u0159\u00edni<\/strong><\/td>\n<td style=\"padding: 10px;\">\u010casto na kombinovan\u00e9m v\u00fdstupu nebo m\u00edstn\u00edm odpojovac\u00edm bod\u011b<\/td>\n<td style=\"padding: 10px;\">Na \u00farovni stringu, \u00farovni skupiny string\u016f nebo kombinovan\u00e9m v\u00fdstupn\u00edm ochrann\u00e9m bod\u011b, v z\u00e1vislosti na architektu\u0159e<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px;\"><strong>Kdy jsou oba pot\u0159eba<\/strong><\/td>\n<td style=\"padding: 10px;\">Kdy\u017e sk\u0159\u00ed\u0148 pot\u0159ebuje bezpe\u010dnou manu\u00e1ln\u00ed izolaci i automatickou ochranu proti poruch\u00e1m<\/td>\n<td style=\"padding: 10px;\">Stejn\u00e9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Kl\u00ed\u010dov\u00fd bod je jednoduch\u00fd: izol\u00e1tor je hlavn\u011b o <strong>\u0159\u00edzen\u00e9m odpojen\u00ed pro lidi a servisn\u00ed pr\u00e1ce<\/strong>. Jisti\u010d je hlavn\u011b o <strong>ochrann\u00e9m p\u0159eru\u0161en\u00ed b\u011bhem provozu<\/strong>.<\/p>\n<h2>Pro\u010d slu\u010dovac\u00ed sk\u0159\u00ed\u0148 \u010dasto pot\u0159ebuje ob\u011b funkce<\/h2>\n<p>PV slu\u010dovac\u00ed sk\u0159\u00ed\u0148 spojuje v\u00edce string\u016f dohromady p\u0159edt\u00edm, ne\u017e je DC v\u00fdstup odesl\u00e1n d\u00e1le k st\u0159\u00edda\u010di nebo jin\u00e9mu sb\u011brn\u00e9mu bodu. To vytv\u00e1\u0159\u00ed dv\u011b odli\u0161n\u00e9 konstruk\u010dn\u00ed ot\u00e1zky:<\/p>\n<h3>Probl\u00e9m 1: Vystaven\u00ed poruch\u00e1m a zp\u011btn\u00e9mu proudu<\/h3>\n<p>Kdy\u017e je n\u011bkolik string\u016f zapojeno paraleln\u011b, m\u016f\u017ee b\u00fdt poruchov\u00fd string vystaven zp\u011btn\u00e9mu proudu ze zdrav\u00fdch string\u016f. Proto se nadproudov\u00e1 ochrana st\u00e1v\u00e1 nezbytnou, jakmile to architektura string\u016f a r\u00e1mec k\u00f3du vy\u017eaduj\u00ed. V n\u00e1vrhu zalo\u017een\u00e9m na NEC je tato konverzace spojena s <strong>690.9 Nadproudov\u00e1 ochrana<\/strong>. V n\u00e1vrhu zalo\u017een\u00e9m na IEC se stejn\u00e1 logika objevuje v pravidlech ochrany zdrojov\u00e9ho obvodu pro PV pole.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\">\n        <img decoding=\"async\" src=\"https:\/\/img.viox.com\/Technical-diagram-showing-per-string-protection-and-output-isolation-inside-a-solar-combiner-box.webp\" alt=\"Technical diagram showing per-string protection and output isolation inside a solar combiner box\" style=\"max-width: 100%; height: auto;\"><figcaption style=\"margin-top: 8px; color: #555;\"><i>Aplika\u010dn\u00ed diagram: Vizualizace poruchov\u00e9ho sc\u00e9n\u00e1\u0159e toku zp\u011btn\u00e9ho proudu a jak ochrana na string v kombinaci s v\u00fdstupn\u00ed izolac\u00ed chr\u00e1n\u00ed syst\u00e9m.<\/i><\/figcaption><\/figure>\n<p>Tuto nadproudovou roli m\u016f\u017ee \u0159e\u0161it:<\/p>\n<ul>\n<li>stringov\u00e9 pojistky<\/li>\n<li>Jisti\u010de stejnosm\u011brn\u00e9ho proudu<\/li>\n<li>jin\u00e9 ochrann\u00e9 uspo\u0159\u00e1d\u00e1n\u00ed akceptovan\u00e9 projektovou normou<\/li>\n<\/ul>\n<p><strong>Profesion\u00e1ln\u00ed tip:<\/strong> V PV n\u00e1vrhu ve stylu NEC je rychl\u00e1 technick\u00e1 kontrola porovnat vystaven\u00ed poruchov\u00e9ho obvodu proti zp\u011btn\u00e9mu proudu dostupn\u00e9mu ze zb\u00fdvaj\u00edc\u00edch paraleln\u00edch string\u016f. Ve slu\u010dovac\u00ed sk\u0159\u00edni s 12 stringy m\u016f\u017ee b\u00fdt poruchov\u00fd string vystaven zhruba <strong>11 x Isc<\/strong> z ostatn\u00edch string\u016f. Proto n\u00e1vrh\u00e1\u0159i nemohou dimenzovat ochranu pohledem na jeden string izolovan\u011b.<\/p>\n<p>Pokud chcete \u0161ir\u0161\u00ed obr\u00e1zek koordinace, <a href=\"https:\/\/test.viox.com\/cs\/solar-combiner-box-protection-design\/\">n\u00e1vrh ochrany sol\u00e1rn\u00ed slu\u010dovac\u00ed sk\u0159\u00edn\u011b<\/a> je nejbli\u017e\u0161\u00ed podp\u016frn\u00e1 str\u00e1nka.<\/p>\n<h3>Probl\u00e9m 2: Bezpe\u010dn\u00e9 odpojen\u00ed nap\u00e1jen\u00ed pro servis<\/h3>\n<p>I po z\u00e1sahu ochrann\u00e9ho za\u0159\u00edzen\u00ed pot\u0159ebuje servisn\u00ed person\u00e1l st\u00e1le promy\u0161len\u00fd zp\u016fsob, jak sk\u0159\u00ed\u0148 izolovat pro pr\u00e1ci. Sol\u00e1rn\u00ed moduly pokra\u010duj\u00ed ve v\u00fdrob\u011b nap\u011bt\u00ed, kdykoli je k dispozici z\u00e1\u0159en\u00ed. To znamen\u00e1, \u017ee servisn\u00ed postup st\u00e1le pot\u0159ebuje spr\u00e1vn\u00fd odpojovac\u00ed prost\u0159edek, nejen ud\u00e1lost vypnut\u00ed.<\/p>\n<p>V americk\u00e9 praxi je to spojeno s <strong>NEC 690.13<\/strong> a souvisej\u00edc\u00edmi po\u017eadavky na odpojovac\u00ed prost\u0159edky. V projektech zalo\u017een\u00fdch na IEC se stejn\u00e9 o\u010dek\u00e1v\u00e1n\u00ed projevuje prost\u0159ednictv\u00edm po\u017eadavk\u016f na izolaci FV, jako nap\u0159\u00edklad <strong>IEC 60364-7-712<\/strong>. V Austr\u00e1lii a na Nov\u00e9m Z\u00e9landu, <strong>AS\/NZS 5033<\/strong> je je\u0161t\u011b explicitn\u011bj\u0161\u00ed ohledn\u011b role a um\u00edst\u011bn\u00ed FV DC izol\u00e1tor\u016f.<\/p>\n<p><strong>Profesion\u00e1ln\u00ed tip:<\/strong> V\u00fdb\u011br izolace by se m\u011bl tak\u00e9 \u0159\u00eddit <strong>nap\u011bt\u00edm napr\u00e1zdno korigovan\u00fdm za studena<\/strong>, nejen nomin\u00e1ln\u00edm ozna\u010den\u00edm syst\u00e9mu. Nap\u011bt\u00ed FV stringu stoup\u00e1 s poklesem teploty modulu, tak\u017ee izol\u00e1tor vybran\u00fd p\u0159\u00edli\u0161 bl\u00edzko STC Voc m\u016f\u017ee b\u00fdt poddimenzovan\u00fd za chladn\u00fdch r\u00e1n, i kdy\u017e na pap\u00ed\u0159e vypadal p\u0159ijateln\u011b.<\/p>\n<p>Praktick\u00fd z\u00e1v\u011br je, \u017ee mnoho slu\u010dovac\u00edch box\u016f pot\u0159ebuje oboj\u00ed:<\/p>\n<ul>\n<li>an <strong>funkci nadproudov\u00e9 ochrany<\/strong><\/li>\n<li>an <strong>funkci izolace \/ odpojen\u00ed<\/strong><\/li>\n<\/ul>\n<p>Tyto funkce mohou b\u00fdt um\u00edst\u011bny v samostatn\u00fdch za\u0159\u00edzen\u00edch, nebo v n\u011bkter\u00fdch p\u0159\u00edpadech mohou b\u00fdt spln\u011bny vhodn\u011b dimenzovan\u00fdm a akceptovan\u00fdm uspo\u0159\u00e1d\u00e1n\u00edm za\u0159\u00edzen\u00ed. Nem\u011bly by se v\u0161ak pova\u017eovat za stejnou pr\u00e1ci.<\/p>\n<h2>Jak spolupracuj\u00ed v praxi<\/h2>\n<p>Uva\u017eujme slu\u010dovac\u00ed box v komer\u010dn\u00ed nebo pr\u016fmyslov\u00e9 FV instalaci s v\u00edce stringy vstupuj\u00edc\u00edmi do spole\u010dn\u00e9 sb\u011brnice.<\/p>\n<p>Nadproudov\u00e1 za\u0159\u00edzen\u00ed na \u00farovni stringu nebo skupiny jsou zde proto, aby omezila vystaven\u00ed poru\u0161e a zabr\u00e1nila po\u0161kozen\u00ed zbytku kabel\u00e1\u017ee pole jedn\u00edm abnorm\u00e1ln\u00edm obvodem. V\u00fdstupn\u00ed izol\u00e1tor nebo odpojovac\u00ed za\u0159\u00edzen\u00ed je zde proto, aby technik mohl z\u00e1m\u011brn\u011b odd\u011blit slu\u010dova\u010d od navazuj\u00edc\u00edho veden\u00ed, uzamknout sp\u00edna\u010d v bezpe\u010dn\u00e9 poloze, kde je to vy\u017eadov\u00e1no, a pracovat na krytu s jasn\u011bj\u0161\u00edm servisn\u00edm postupem.<\/p>\n<p>Toto odd\u011blen\u00ed nen\u00ed nadbyte\u010dn\u00e9. Je to to, co \u010din\u00ed box funk\u010dn\u00edm v ter\u00e9nu.<\/p>\n<p>V projektech, kde je toto rozli\u0161en\u00ed dob\u0159e zvl\u00e1dnut\u00e9, mohou technici:<\/p>\n<ul>\n<li>identifikovat vadn\u00fd string nebo v\u011btev<\/li>\n<li>ovl\u00e1dat ochrann\u00e1 a odpojovac\u00ed za\u0159\u00edzen\u00ed ve spr\u00e1vn\u00e9m po\u0159ad\u00ed<\/li>\n<li>bezpe\u010dn\u011b izolovat box pro servis<\/li>\n<li>obnovit zdrav\u00e9 obvody s men\u0161\u00edm zmatkem a krat\u0161\u00edmi prostoji<\/li>\n<\/ul>\n<h2>Kdy je funkce DC izol\u00e1toru povinn\u00e1<\/h2>\n<p>Pe\u010dliv\u00e9 formulace zde hraj\u00ed roli.<\/p>\n<p>V\u011bt\u0161ina norem <strong>ne<\/strong> ne\u0159\u00edk\u00e1, \u017ee ka\u017ed\u00fd projekt mus\u00ed pou\u017e\u00edvat jeden p\u0159esn\u00fd tvar produktu ozna\u010den\u00fd jako \u201cizol\u00e1tor\u201d v ka\u017ed\u00e9m slu\u010dovac\u00edm boxu. Co vy\u017eaduj\u00ed, je vyhovuj\u00edc\u00ed <strong>odpojovac\u00ed prost\u0159edek<\/strong>.<\/p>\n<p>V praxi je vyhrazen\u00fd DC izol\u00e1tor nebo odp\u00edna\u010d \u010dasto nejp\u0159\u00edm\u011bj\u0161\u00ed zp\u016fsob, jak splnit tuto povinnost, kdy\u017e projekt pot\u0159ebuje:<\/p>\n<ul>\n<li>m\u00edstn\u00ed \u00fadr\u017eb\u00e1\u0159sk\u00fd odpojova\u010d na v\u00fdstupu slu\u010dova\u010de<\/li>\n<li>jasn\u011b ozna\u010den\u00fd servisn\u00ed sp\u00ednac\u00ed bod<\/li>\n<li>uzamykatelnou otev\u0159enou polohu<\/li>\n<li>za\u0159\u00edzen\u00ed vybran\u00e9 hlavn\u011b pro odpojovac\u00ed povinnost sp\u00ed\u0161e ne\u017e pro ochrann\u00e9 vyp\u00edn\u00e1n\u00ed<\/li>\n<\/ul>\n<p>To je d\u016fvod, pro\u010d vyhrazen\u00e9 DC izol\u00e1tory z\u016fst\u00e1vaj\u00ed b\u011b\u017en\u00e9 v FV slu\u010dovac\u00edch boxech i v syst\u00e9mech, kter\u00e9 ji\u017e zahrnuj\u00ed ochrann\u00e9 jisti\u010de nebo pojistky. Rozhoduj\u00edc\u00ed ot\u00e1zkou obvykle nen\u00ed preference katalogu. Jde o to, zda \u00fadr\u017eb\u00e1\u0159sk\u00fd t\u00fdm z\u00edsk\u00e1 jasn\u011bj\u0161\u00ed, bezpe\u010dn\u011bj\u0161\u00ed a l\u00e9pe kontrolovateln\u00fd izola\u010dn\u00ed bod.<\/p>\n<p>Pokud \u010dten\u00e1\u0159 pot\u0159ebuje podrobn\u011bj\u0161\u00ed informace o konkr\u00e9tn\u00edch za\u0159\u00edzen\u00edch, p\u0159irozen\u00e9 podp\u016frn\u00e9 str\u00e1nky jsou <a href=\"https:\/\/test.viox.com\/cs\/dc-isolator-switch\/\">DC izola\u010dn\u00ed sp\u00edna\u010d<\/a> a <a href=\"https:\/\/test.viox.com\/cs\/what-is-a-dc-isolator-switch\/\">co je to DC izola\u010dn\u00ed sp\u00edna\u010d<\/a>.<\/p>\n<h2>Kdy je funkce DC jisti\u010de povinn\u00e1<\/h2>\n<p>Nadproudov\u00e1 ochrana je povinn\u00e1, kdy\u017e jsou vodi\u010de nebo za\u0159\u00edzen\u00ed vystaveny poruchov\u00e9mu proudu, kter\u00fd p\u0159ekra\u010duje to, co obvod dok\u00e1\u017ee bezpe\u010dn\u011b vydr\u017eet.<\/p>\n<p>V FV slu\u010dovac\u00edch boxech to nab\u00fdv\u00e1 na d\u016fle\u017eitosti zejm\u00e9na tehdy, kdy\u017e:<\/p>\n<ul>\n<li>t\u0159i nebo v\u00edce string\u016f je paraleln\u011b zapojeno podle logiky NEC<\/li>\n<li>specifikace projektu vy\u017eaduje resetovatelnou nadproudovou ochranu<\/li>\n<li>v\u00fdstupn\u00ed vodi\u010de vy\u017eaduj\u00ed ochrann\u00e9 za\u0159\u00edzen\u00ed na slu\u010dova\u010di<\/li>\n<li>n\u00e1vrh pot\u0159ebuje monitoringu p\u0159\u00e1telskou, resetovatelnou alternativu k ochran\u011b pouze pojistkami<\/li>\n<\/ul>\n<p>D\u016fvodem, pro\u010d je specifikov\u00e1n DC jisti\u010d, nen\u00ed to, \u017ee m\u00e1 p\u00e1\u010dku. Je to proto, \u017ee obvod pot\u0159ebuje <strong>automatick\u00e9 p\u0159eru\u0161en\u00ed poruchy<\/strong> za DC podm\u00ednek.<\/p>\n<p>Pro hlub\u0161\u00ed ponor pouze do jisti\u010d\u016f jsou nejrelevantn\u011bj\u0161\u00ed podp\u016frn\u00e9 str\u00e1nky <a href=\"https:\/\/test.viox.com\/cs\/a-practical-guide-to-dc-circuit-breakers-for-solar-battery-and-ev-systems\/\">praktick\u00fd pr\u016fvodce DC jisti\u010di<\/a> a <a href=\"https:\/\/test.viox.com\/cs\/dc-circuit-breaker-sizing-nec-690-vs-iec-60947-2-guide\/\">Dimenzov\u00e1n\u00ed DC jisti\u010d\u016f: NEC 690 vs IEC 60947-2<\/a>.<\/p>\n<h2>M\u016f\u017ee jedno nahradit druh\u00e9?<\/h2>\n<p>Ne automaticky.<\/p>\n<h3>DC izol\u00e1tor nenahrazuje DC jisti\u010d, kdy\u017e je vy\u017eadov\u00e1na nadproudov\u00e1 ochrana<\/h3>\n<p>Izol\u00e1tor nedetekuje nadproud, nevyp\u00edn\u00e1 automaticky a nem\u011bl by b\u00fdt pova\u017eov\u00e1n za za\u0159\u00edzen\u00ed, kter\u00e9 odstra\u0148uje vznikaj\u00edc\u00ed poruchu jednodu\u0161e proto, \u017ee jej lze ru\u010dn\u011b otev\u0159\u00edt.<\/p>\n<h3>DC jisti\u010d automaticky nenahrazuje vyhrazen\u00fd izol\u00e1tor<\/h3>\n<p>Jisti\u010d m\u016f\u017ee b\u00fdt v n\u011bkter\u00fdch projektech akceptov\u00e1n jako odpojovac\u00ed prost\u0159edek, ale projektant mus\u00ed st\u00e1le ov\u011b\u0159it:<\/p>\n<ul>\n<li>seznam a ozna\u010den\u00ed<\/li>\n<li>vhodnost pro DC aplikace<\/li>\n<li>zda lze otev\u0159enou polohu jasn\u011b identifikovat a uzamknout tam, kde je to vy\u017eadov\u00e1no<\/li>\n<li>zda postup \u00fadr\u017eby z\u016fst\u00e1v\u00e1 bezpe\u010dn\u00fd a praktick\u00fd<\/li>\n<\/ul>\n<p>Proto je lep\u0161\u00ed in\u017een\u00fdrsk\u00e1 ot\u00e1zka ne \u201ckter\u00fd vyhr\u00e1v\u00e1?\u201d. Je to \u201cposkytuje tento n\u00e1vrh st\u00e1le ochranu i izolaci zp\u016fsobem, kter\u00fd k\u00f3d, inspektor a \u00fadr\u017eb\u00e1\u0159sk\u00fd t\u00fdm akceptuj\u00ed?\u201d<\/p>\n<h2>Praktick\u00e9 chyby p\u0159i v\u00fdb\u011bru v FV slu\u010dovac\u00edch boxech<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\">\n        <img decoding=\"async\" src=\"https:\/\/img.viox.com\/Technical-infographic-showing-common-DC-isolator-and-DC-breaker-selection-mistakes-in-solar-combiner-boxes.webp\" alt=\"Technical infographic showing common DC isolator and DC breaker selection mistakes in solar combiner boxes\" style=\"max-width: 100%; height: auto;\"><figcaption style=\"margin-top: 8px; color: #555;\"><i>Bezpe\u010dnost FV slu\u010dovac\u00edch box\u016f: 4 b\u011b\u017en\u00e9 chyby p\u0159i v\u00fdb\u011bru p\u0159i specifikaci DC izol\u00e1tor\u016f a AC\/DC jisti\u010d\u016f, zd\u016fraz\u0148uj\u00edc\u00ed nebezpe\u010d\u00ed nespr\u00e1vn\u00e9ho um\u00edst\u011bn\u00ed a poddimenzov\u00e1n\u00ed.<\/i><\/figcaption><\/figure>\n<h3>1. Pou\u017eit\u00ed za\u0159\u00edzen\u00ed dimenzovan\u00fdch pro AC v DC FV obvodu<\/h3>\n<p>To z\u016fst\u00e1v\u00e1 jednou z nejnebezpe\u010dn\u011bj\u0161\u00edch chyb v ter\u00e9nu. DC p\u0159eru\u0161en\u00ed nen\u00ed tot\u00e9\u017e co AC p\u0159eru\u0161en\u00ed. Za\u0159\u00edzen\u00ed, kter\u00e9 je pohodln\u00e9 v AC panelu, nen\u00ed automaticky vhodn\u00e9 pro FV DC slu\u010dovac\u00ed box. V AC proch\u00e1z\u00ed proud p\u0159irozen\u00fdm pr\u016fchodem nulou ka\u017edou periodu, co\u017e pom\u00e1h\u00e1 uhasit oblouk. V DC neexistuje \u017e\u00e1dn\u00fd p\u0159irozen\u00fd pr\u016fchod nulou. Pokud za\u0159\u00edzen\u00ed nen\u00ed navr\u017eeno pro \u0159\u00edzen\u00ed DC oblouku, oblouk se m\u016f\u017ee udr\u017eet p\u0159es otev\u00edrac\u00ed kontakty.<\/p>\n<p><strong>D\u016fsledek:<\/strong> oblouk se nemus\u00ed s\u00e1m uhasit, za\u0159\u00edzen\u00ed nemus\u00ed p\u0159eru\u0161it a kryt slu\u010dova\u010de m\u016f\u017ee sho\u0159et.<\/p>\n<h3>2. Pova\u017eov\u00e1n\u00ed stringov\u00fdch jisti\u010d\u016f za celou strategii ochrany<\/h3>\n<p>\u0158ada jisti\u010d\u016f pro jednotliv\u00e9 stringy automaticky ne\u0159e\u0161\u00ed po\u017eadavek na odpojovac\u00ed prost\u0159edky a automaticky nevytv\u00e1\u0159\u00ed \u010dist\u00fd pracovn\u00ed postup \u00fadr\u017eby.<\/p>\n<p><strong>D\u016fsledek:<\/strong> Technici se mohou b\u011bhem servisu st\u00e1le setkat s nap\u00e1jenou sb\u011brnic\u00ed nebo matouc\u00ed sekvenc\u00ed vyp\u00edn\u00e1n\u00ed.<\/p>\n<h3>3. Zach\u00e1zen\u00ed s v\u00fdstupn\u00edm izol\u00e1torem, jako by \u0159e\u0161il nadproudovou ochranu<\/h3>\n<p>Ne\u0159e\u0161\u00ed. Vyhrazen\u00e9 odpojovac\u00ed m\u00edsto a ochrann\u00e1 vyp\u00ednac\u00ed funkce jsou r\u016fzn\u00e9 vrstvy n\u00e1vrhu.<\/p>\n<p><strong>D\u016fsledek:<\/strong> Porucha m\u016f\u017ee p\u0159etrv\u00e1vat, dokud se vodi\u010de, svorky nebo \u010d\u00e1sti krytu nep\u0159eh\u0159ej\u00ed.<\/p>\n<h3>4. V\u00fdb\u011br pouze podle jmenovit\u00e9ho proudu<\/h3>\n<p>V slu\u010dovac\u00edch boxech FV syst\u00e9m\u016f z\u00e1le\u017e\u00ed na t\u0159\u00edd\u011b nap\u011bt\u00ed, uspo\u0159\u00e1d\u00e1n\u00ed p\u00f3l\u016f, vyu\u017eit\u00ed stejnosm\u011brn\u00e9ho proudu, vyp\u00ednac\u00ed schopnosti, teplotn\u00edm chov\u00e1n\u00ed a skute\u010dn\u00e9 architektu\u0159e string\u016f.<\/p>\n<p><strong>D\u016fsledek:<\/strong> Vybran\u00e9 za\u0159\u00edzen\u00ed m\u016f\u017ee na typov\u00e9m \u0161t\u00edtku vypadat spr\u00e1vn\u011b, ale pro skute\u010dn\u00e9 FV zat\u00ed\u017een\u00ed je st\u00e1le poddimenzovan\u00e9.<\/p>\n<h3>5. Instalace odpojova\u010de na nespr\u00e1vn\u00e9 m\u00edsto<\/h3>\n<p>Pokud je c\u00edlem izolace cel\u00e9ho boxu nebo navazuj\u00edc\u00edho obvodu, mus\u00ed b\u00fdt odpojovac\u00ed za\u0159\u00edzen\u00ed um\u00edst\u011bno tak, aby skute\u010dn\u011b odd\u011blilo zam\u00fd\u0161lenou \u010d\u00e1st obvodu. Sp\u00edna\u010d na nespr\u00e1vn\u00e9m m\u00edst\u011b m\u016f\u017ee ponechat sb\u011brnici nebo navazuj\u00edc\u00ed vodi\u010de pod nap\u011bt\u00edm, i kdy\u017e \u00fadr\u017eb\u00e1\u0159sk\u00fd t\u00fdm p\u0159edpokl\u00e1d\u00e1 opak.<\/p>\n<p><strong>D\u016fsledek:<\/strong> Box se m\u016f\u017ee na pap\u00ed\u0159e jevit jako izolovan\u00fd, zat\u00edmco v ter\u00e9nu je st\u00e1le p\u0159\u00edtomno nebezpe\u010dn\u00e9 nap\u011bt\u00ed.<\/p>\n<h3>6. M\u00edch\u00e1n\u00ed syst\u00e9m\u016f norem bez uveden\u00ed z\u00e1kladu projektu<\/h3>\n<p>Kontrola n\u00e1vrhu se velmi rychle zkomplikuje, kdy\u017e jsou po\u017eadavky NEC, IEC a AS\/NZS citov\u00e1ny spole\u010dn\u011b, ani\u017e by bylo uvedeno, kter\u00fd soubor pravidel projekt \u0159\u00edd\u00ed. Dobr\u00e1 dokumentace v\u017edy tento z\u00e1klad jasn\u011b uv\u00e1d\u00ed.<\/p>\n<p><strong>D\u016fsledek:<\/strong> T\u00fdm m\u016f\u017ee schv\u00e1lit nespr\u00e1vnou sadu za\u0159\u00edzen\u00ed, neproj\u00edt kontrolou nebo vytvo\u0159it postup \u00fadr\u017eby, kter\u00fd neodpov\u00edd\u00e1 platn\u00e9 norm\u011b.<\/p>\n<h2>\u010cASTO KLADEN\u00c9 DOTAZY<\/h2>\n<h3>Pot\u0159ebuji v ka\u017ed\u00e9 slu\u010dovac\u00ed sk\u0159\u00ed\u0148ce jak DC odpojova\u010d, tak DC jisti\u010d?<\/h3>\n<p>Ne v\u017edy jako dv\u011b samostatn\u00e1 za\u0159\u00edzen\u00ed, ale mnoho slu\u010dovac\u00edch box\u016f pot\u0159ebuje oboj\u00ed <strong>funkce<\/strong>: izolaci a nadproudovou ochranu. Zp\u016fsob implementace t\u011bchto funkc\u00ed z\u00e1vis\u00ed na z\u00e1kladu projektov\u00e9ho k\u00f3du, architektu\u0159e string\u016f a vhodnosti za\u0159\u00edzen\u00ed.<\/p>\n<h3>M\u016f\u017ee jisti\u010d DC slou\u017eit jako odpojovac\u00ed prost\u0159edek FV syst\u00e9mu?<\/h3>\n<p>N\u011bkdy ano, ale pouze pokud jeho seznam, ozna\u010den\u00ed a podrobnosti o instalaci podporuj\u00ed tuto funkci. In\u017een\u00fd\u0159i by si to m\u011bli ov\u011b\u0159it, m\u00edsto aby p\u0159edpokl\u00e1dali, \u017ee ka\u017ed\u00fd DC jisti\u010d je automaticky vyhovuj\u00edc\u00ed izol\u00e1tor.<\/p>\n<h3>M\u016f\u017ee DC odpojova\u010d chr\u00e1nit proti nadproudu nebo zkratu?<\/h3>\n<p>Ne. Standardn\u00ed odpojova\u010d nen\u00ed nadproudov\u00e9 ochrann\u00e9 za\u0159\u00edzen\u00ed.<\/p>\n<h3>Jsou stringov\u00e9 jisti\u010de povinn\u00e9 v ka\u017ed\u00e9 slu\u010dovac\u00ed sk\u0159\u00ed\u0148ce?<\/h3>\n<p>Ne. Pot\u0159eba nadproudov\u00e9 ochrany na \u00farovni stringu z\u00e1vis\u00ed na po\u010dtu paraleln\u00edch string\u016f, expozici vodi\u010d\u016f, r\u00e1mci p\u0159edpis\u016f a omezen\u00edch za\u0159\u00edzen\u00ed. V mnoha projektech z\u016fst\u00e1vaj\u00ed stringov\u00e9 pojistky b\u011b\u017en\u011bj\u0161\u00edm \u0159e\u0161en\u00edm.<\/p>\n<h3>Jak\u00fd je nejbezpe\u010dn\u011bj\u0161\u00ed zp\u016fsob, jak uva\u017eovat o rozd\u00edlu?<\/h3>\n<p>Pova\u017eujte izol\u00e1tor za za\u0159\u00edzen\u00ed zvolen\u00e9 pro <strong>z\u00e1m\u011brn\u00e9 odpojen\u00ed<\/strong> a jisti\u010d jako za\u0159\u00edzen\u00ed zvolen\u00e9 pro <strong>automatick\u00e9 p\u0159eru\u0161en\u00ed poruchy<\/strong>. Pot\u00e9 ov\u011b\u0159te, zda projekt st\u00e1le pot\u0159ebuje ob\u011b funkce samostatn\u011b.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Inside a solar combiner box: A clear internal view showing DC circuit breakers used for string protection and a main output-side DC isolator for manual disconnection. Inside every solar combiner box, two types of DC switching devices show up repeatedly, and they are not interchangeable by default. A DC isolator is mainly there to provide [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15202,"comment_status":"closed","ping_status":"open","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-15201","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\/15201","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=15201"}],"version-history":[{"count":2,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/15201\/revisions"}],"predecessor-version":[{"id":23344,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/15201\/revisions\/23344"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media\/15202"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media?parent=15201"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/categories?post=15201"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/tags?post=15201"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}