{"id":20850,"date":"2025-12-15T09:30:56","date_gmt":"2025-12-15T01:30:56","guid":{"rendered":"https:\/\/viox.com\/?p=20850"},"modified":"2025-12-15T09:30:58","modified_gmt":"2025-12-15T01:30:58","slug":"pv-dc-protection-explained-mcbs-fuses-and-spds-vs-rcds","status":"publish","type":"post","link":"https:\/\/test.viox.com\/cs\/pv-dc-protection-explained-mcbs-fuses-and-spds-vs-rcds\/","title":{"rendered":"Vysv\u011btlen\u00ed DC ochrany FV syst\u00e9m\u016f: MCB, pojistky a SPD vs. RCD"},"content":{"rendered":"<div class=\"product-intro\">\n<p>U\u017eivatel Redditu polo\u017eil zd\u00e1nliv\u011b nevinnou ot\u00e1zku: \u201cM\u00e1m pro zv\u00fd\u0161en\u00ed bezpe\u010dnosti nainstalovat proudov\u00fd chr\u00e1ni\u010d (RCD) na DC vstupn\u00ed stranu m\u00e9 sol\u00e1rn\u00ed slu\u010dovac\u00ed sk\u0159\u00edn\u011b?\u201d B\u011bhem n\u011bkolika minut zaplavili vl\u00e1kno licencovan\u00ed elektrik\u00e1\u0159i a sol\u00e1rn\u00ed in\u017een\u00fd\u0159i nal\u00e9hav\u00fdmi varov\u00e1n\u00edmi: <strong>Ned\u011blejte to. Je to nebezpe\u010dn\u00e9.<\/strong><\/p>\n<p>Odpov\u011b\u010f odhaluje z\u00e1sadn\u00ed mylnou p\u0159edstavu, kter\u00e1 v\u00e1\u017en\u011b ohro\u017euje sol\u00e1rn\u00ed instalace typu \u201cud\u011blej si s\u00e1m\u201d \u2013 a dokonce i n\u011bkter\u00e9 profesion\u00e1ln\u00ed. Pokud jste zvykl\u00ed na AC elektrick\u00e9 my\u0161len\u00ed, kde \u201ev\u00edce ochrany se rovn\u00e1 lep\u0161\u00ed\u201c, sv\u011bt fotovoltaick\u00fdch DC obvod\u016f vy\u017eaduje zcela odli\u0161n\u00fd p\u0159\u00edstup. Instalace standardn\u00edho RCD na DC stranu sol\u00e1rn\u00edho syst\u00e9mu nen\u00ed jen ne\u00fa\u010dinn\u00e1 \u2013 m\u016f\u017ee vytvo\u0159it fale\u0161n\u00fd pocit bezpe\u010d\u00ed a z\u00e1rove\u0148 ponechat va\u0161i instalaci zranitelnou v\u016f\u010di po\u017e\u00e1r\u016fm a \u00faraz\u016fm elektrick\u00fdm proudem.<\/p>\n<p>Tato p\u0159\u00edru\u010dka vysv\u011btluje, pro\u010d RCD katastrof\u00e1ln\u011b selh\u00e1vaj\u00ed v DC aplikac\u00edch, jak\u00e1 ochrann\u00e1 za\u0159\u00edzen\u00ed skute\u010dn\u011b pot\u0159ebujete pro FV slu\u010dovac\u00ed sk\u0159\u00edn\u011b a kde ve skute\u010dnosti doch\u00e1z\u00ed k ochran\u011b proti \u00faniku v modern\u00edch sol\u00e1rn\u00edch syst\u00e9mech.<\/p>\n<h2>Pro\u010d RCD nemohou fungovat v DC obvodech<\/h2>\n<h3>Z\u00e1sadn\u00ed nekompatibilita<\/h3>\n<p>Proudov\u00e9 chr\u00e1ni\u010de funguj\u00ed tak, \u017ee detekuj\u00ed nerovnov\u00e1hu v toku st\u0159\u00eddav\u00e9ho proudu. Uvnit\u0159 ka\u017ed\u00e9ho RCD se nach\u00e1z\u00ed diferenci\u00e1ln\u00ed transform\u00e1tor (toroid), kter\u00fd monitoruje f\u00e1zov\u00e9 a nulov\u00e9 vodi\u010de. Ve zdrav\u00e9m AC obvodu se proud tekouc\u00ed ven rovn\u00e1 proudu vracej\u00edc\u00edmu se, \u010d\u00edm\u017e se vytv\u00e1\u0159ej\u00ed protilehl\u00e1 magnetick\u00e1 pole, kter\u00e1 se navz\u00e1jem ru\u0161\u00ed. Kdy\u017e dojde k \u00faniku \u2013 \u0159ekn\u011bme, kdy\u017e se osoba dotkne \u017eiv\u00e9ho vodi\u010de \u2013 nerovnov\u00e1ha vytvo\u0159\u00ed v\u00fdsledn\u00e9 magnetick\u00e9 pole, kter\u00e9 indukuje proud v sn\u00edmac\u00ed c\u00edvce a vypne za\u0159\u00edzen\u00ed.<\/p>\n<p>Cel\u00fd tento mechanismus z\u00e1vis\u00ed na st\u0159\u00eddav\u00e9m proudu, kter\u00fd vytv\u00e1\u0159\u00ed neust\u00e1le se m\u011bn\u00edc\u00ed magnetick\u00e1 pole. Stejnosm\u011brn\u00fd proud vytv\u00e1\u0159\u00ed st\u00e1l\u00fd, nem\u011bnn\u00fd magnetick\u00fd tok, kter\u00fd z\u00e1sadn\u011b naru\u0161uje tuto metodu detekce.<\/p>\n<h3>Probl\u00e9m saturace: RCD oslepnou<\/h3>\n<p>Kdy\u017e stejnosm\u011brn\u00fd unikaj\u00edc\u00ed proud prot\u00e9k\u00e1 transform\u00e1torem RCD, vytv\u00e1\u0159\u00ed konstantn\u00ed magnetick\u00fd tok, kter\u00fd saturuje magnetick\u00e9 j\u00e1dro. Saturovan\u00e9 j\u00e1dro ji\u017e nem\u016f\u017ee reagovat na zm\u011bny magnetick\u00e9ho toku. Zde je ta nebezpe\u010dn\u00e1 \u010d\u00e1st: jakmile je RCD saturov\u00e1n stejnosm\u011brnou poruchou, \u201coslepne\u201d i v\u016f\u010di n\u00e1sledn\u00fdm st\u0159\u00eddav\u00fdm poruch\u00e1m. Pokud po stejnosm\u011brn\u00e9 saturaci dojde k nebezpe\u010dn\u00e9mu st\u0159\u00eddav\u00e9mu \u00faniku, RCD jej nezaznamen\u00e1 a nevypne.<\/p>\n<p>Ve fotovoltaick\u00fdch syst\u00e9mech, kde je degradace izolace kolem DC kabel\u016f b\u011b\u017en\u00e1 v d\u016fsledku vystaven\u00ed pov\u011btrnostn\u00edm vliv\u016fm, UV z\u00e1\u0159en\u00ed a tepeln\u00e9mu cyklov\u00e1n\u00ed, jsou DC \u00fanikov\u00e9 poruchy skute\u010dnou a trvalou hrozbou. RCD typu AC \u2013 nejb\u011b\u017en\u011bj\u0161\u00ed typ pro dom\u00e1cnosti \u2013 nem\u016f\u017ee detekovat tyto hladk\u00e9 stejnosm\u011brn\u00e9 zbytkov\u00e9 proudy a m\u016f\u017ee selhat ti\u0161e.<\/p>\n<p><strong>Tabulka 1: Typy RCD a DC kompatibilita<\/strong><\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\" border=\"1\">\n<thead>\n<tr style=\"background-color: #f9f9f9;\">\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Typ RCD<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Detekuje AC poruchy<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Detekuje pulzuj\u00edc\u00ed DC<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Detekuje hladk\u00e9 DC<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Riziko DC saturace<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Vhodn\u00e9 pro FV DC stranu?<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Typ AC<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2717<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2717<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Vysok\u00e9 (saturuje p\u0159i jak\u00e9koli DC slo\u017ece)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>NE \u2013 Nebezpe\u010dn\u00e9<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Typ A<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2717 (oslepne p\u0159i &gt;6mA)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">St\u0159edn\u00ed (saturuje nad 6mA DC)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>NE \u2013 Nebezpe\u010dn\u00e9<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Typ F<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2717 (oslepne p\u0159i &gt;10mA)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">St\u0159edn\u00ed (saturuje nad 10mA DC)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>NE \u2013 Nebezpe\u010dn\u00e9<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Typ B<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2713<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">N\u00edzk\u00e9 (elektronick\u00e1 konstrukce)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>NE \u2013 Nespr\u00e1vn\u00e1 aplikace<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>D\u016fle\u017eit\u00e1 pozn\u00e1mka:<\/strong> Dokonce i RCD typu B, kter\u00e9 dok\u00e1\u017eou detekovat hladk\u00e9 DC, jsou navr\u017eeny pro AC obvody s potenci\u00e1ln\u00ed DC kontaminac\u00ed. Nenahrazuj\u00ed spr\u00e1vnou DC nadproudovou ochranu a ochranu proti obloukov\u00e9mu zkratu.<\/p>\n<h3>Pro\u010d jsou DC oblouky nebezpe\u010dn\u011bj\u0161\u00ed<\/h3>\n<p>Krom\u011b detekce existuje druh\u00fd kritick\u00fd probl\u00e9m: zh\u00e1\u0161en\u00ed oblouku. St\u0159\u00eddav\u00fd proud p\u0159ekra\u010duje nulu 100kr\u00e1t za sekundu (v 50Hz syst\u00e9mech), co\u017e poskytuje p\u0159irozen\u00e9 momenty, kdy mohou oblouky zhasnout. V t\u011bchto bodech pr\u016fchodu nulou energie oblouku kles\u00e1 na minimum, co\u017e umo\u017e\u0148uje meze\u0159e dezinsulovat a zabr\u00e1nit op\u011btovn\u00e9mu zap\u00e1len\u00ed.<\/p>\n<p>DC nem\u00e1 \u017e\u00e1dn\u00e9 pr\u016fchody nulou. Jakmile se DC oblouk vytvo\u0159\u00ed, udr\u017euje se neomezen\u011b dlouho, dokud je nap\u011bt\u00ed a proud dostate\u010dn\u00fd. Standardn\u00ed sp\u00edna\u010de a RCD dimenzovan\u00e9 pro AC nemaj\u00ed magnetick\u00e9 zh\u00e1\u0161ec\u00ed c\u00edvky, obloukov\u00e9 komory a prodlu\u017eovac\u00ed mechanismy pot\u0159ebn\u00e9 k nucen\u00e9mu zhasnut\u00ed DC oblouk\u016f. Pou\u017eit\u00ed AC RCD na DC obvodu znamen\u00e1, \u017ee i kdyby n\u011bjak\u00fdm zp\u016fsobem detekoval poruchu, otev\u0159en\u00ed jeho kontakt\u016f by pravd\u011bpodobn\u011b vedlo k trval\u00e9mu oblouku, sva\u0159ov\u00e1n\u00ed kontakt\u016f nebo zni\u010den\u00ed za\u0159\u00edzen\u00ed.<\/p>\n<figure style=\"margin: 20px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/viox-dc-protection-vs-ac-rcd-comparison-chart-showing-correct-dc-rated-mcb-fuses-spd-configuration-versus-dangerous-ac-rcd-installation-on-photovoltaic-combiner-box-systems.webp\" alt=\"VIOX DC protection vs AC RCD comparison chart showing correct DC-rated MCB fuses SPD configuration versus dangerous AC RCD installation on photovoltaic combiner box systems\" \/><figcaption style=\"font-style: italic; font-size: 0.9em; color: #666; margin-top: 8px;\">Srovn\u00e1vac\u00ed tabulka ochrany VIOX DC vs AC RCD zobrazuj\u00edc\u00ed spr\u00e1vnou konfiguraci DC jisti\u010d\u016f, pojistek a SPD versus nebezpe\u010dnou instalaci AC RCD na fotovoltaick\u00fdch slu\u010dovac\u00edch sk\u0159\u00edn\u00edch<\/figcaption><\/figure>\n<h2>DC ochrann\u00e1 trojice: Co skute\u010dn\u011b pat\u0159\u00ed do va\u0161\u00ed slu\u010dovac\u00ed sk\u0159\u00edn\u011b<\/h2>\n<p>Nam\u00edsto RCD vy\u017eaduj\u00ed FV slu\u010dovac\u00ed sk\u0159\u00edn\u011b t\u0159i specializovan\u00e1 DC ochrann\u00e1 za\u0159\u00edzen\u00ed. Ka\u017ed\u00e9 slou\u017e\u00ed odli\u0161n\u00e9 funkci, kterou RCD nemohou poskytnout.<\/p>\n<h3>1. DC jisti\u010d <a href=\"https:\/\/test.viox.com\/cs\/mcb\/\">MCB (miniaturn\u00ed jisti\u010d)<\/a><\/h3>\n<p><strong>Funkce:<\/strong> Nadproudov\u00e1 ochrana a ochrana proti zkratu pro kombinovan\u00fd v\u00fdstup pole.<\/p>\n<p><strong>Pro\u010d z\u00e1le\u017e\u00ed na DC specifikaci:<\/strong> DC jisti\u010de obsahuj\u00ed magnetick\u00e9 zh\u00e1\u0161ec\u00ed c\u00edvky, kter\u00e9 generuj\u00ed magnetick\u00e9 pole pro nata\u017een\u00ed a vtla\u010den\u00ed oblouku do obloukov\u00fdch komor. Tyto komory rozd\u011bluj\u00ed hlavn\u00ed oblouk na n\u011bkolik men\u0161\u00edch s\u00e9riov\u00fdch oblouk\u016f, \u010d\u00edm\u017e dramaticky zvy\u0161uj\u00ed nap\u011bt\u00ed a odpor oblouku, dokud jej obvod ji\u017e nem\u016f\u017ee udr\u017eet. Tato \u201cmetoda p\u0159eru\u0161en\u00ed s vysok\u00fdm odporem\u201d se z\u00e1sadn\u011b li\u0161\u00ed od \u201cp\u0159eru\u0161en\u00ed nulov\u00fdm proudem\u201d pou\u017e\u00edvan\u00e9ho v AC jisti\u010d\u00edch.<\/p>\n<p>DC jisti\u010de mus\u00ed b\u00fdt dimenzov\u00e1ny na maxim\u00e1ln\u00ed nap\u011bt\u00ed napr\u00e1zdno syst\u00e9mu (Voc) p\u0159i nejni\u017e\u0161\u00ed o\u010dek\u00e1van\u00e9 teplot\u011b \u2013 obvykle 600 V nebo 1000 V pro reziden\u010dn\u00ed syst\u00e9my. Jmenovit\u00fd proud by m\u011bl zvl\u00e1dnout sou\u010det v\u0161ech maxim\u00e1ln\u00edch proud\u016f string\u016f (Isc \u00d7 1,25 pro ka\u017ed\u00fd string) s dodate\u010dn\u00fdm bezpe\u010dnostn\u00edm faktorem 125% pro trval\u00fd provoz.<\/p>\n<p><strong>Typick\u00e1 specifikace pro 6-stringov\u00fd syst\u00e9m (14A Isc na string):<\/strong><\/p>\n<ul>\n<li>Celkov\u00fd maxim\u00e1ln\u00ed proud: 6 \u00d7 14A \u00d7 1,25 = 105A<\/li>\n<li>Jmenovit\u00fd proud jisti\u010de s faktorem 125%: 105A \u00d7 1,25 = 131,25A<\/li>\n<li>Zvolen\u00e9 jmenovit\u00e9 hodnoty: <strong>150A DC jisti\u010d, jmenovit\u00e9 nap\u011bt\u00ed 1000V<\/strong><\/li>\n<\/ul>\n<h3>2. DC pojistky (gPV)<\/h3>\n<p><strong>Funkce:<\/strong> Nadproudov\u00e1 ochrana na \u00farovni stringu a ochrana proti zp\u011btn\u00e9mu proudu.<\/p>\n<p><strong>Kritick\u00e1 aplikace:<\/strong> Kdy\u017e se v jednom stringu vyvine porucha, zdrav\u00e9 stringy do n\u011bj mohou vh\u00e1n\u011bt zp\u011btn\u00fd proud. Bez pojistek to p\u0159ekro\u010d\u00ed maxim\u00e1ln\u00ed jmenovit\u00fd proud s\u00e9riov\u00e9 pojistky modulu (20A-30A), co\u017e zp\u016fsob\u00ed p\u0159eh\u0159\u00e1t\u00ed kabelu a po\u017e\u00e1r.<\/p>\n<p>gPV pojistky (IEC 60269-6) se vyzna\u010duj\u00ed vysok\u00fdm jmenovit\u00fdm DC nap\u011bt\u00edm (600V, 1000V, 1500V), DC vyp\u00ednac\u00ed schopnost\u00ed pro paraleln\u00ed poruchy string\u016f a tepeln\u00fdmi vlastnostmi pro trval\u00fd venkovn\u00ed provoz.<\/p>\n<p><strong>Dimenzov\u00e1n\u00ed podle NEC 690.9:<\/strong> Jmenovit\u00fd proud pojistky \u2265 Isc \u00d7 1,56<\/p>\n<p>Pro 14,45A Isc: 14,45A \u00d7 1,56 = 22,54A \u2192 vyberte <strong>25A gPV pojistka<\/strong><\/p>\n<h3>3. <a href=\"https:\/\/test.viox.com\/cs\/spd\/\">DC SPD (P\u0159ep\u011b\u0165ov\u00e1 ochrana)<\/a><\/h3>\n<p><strong>Funkce:<\/strong> Ochrana proti blesku a p\u0159echodn\u00e9mu p\u0159ep\u011bt\u00ed.<\/p>\n<p>Sol\u00e1rn\u00ed pole funguj\u00ed jako lapa\u010de blesk\u016f. DC SPD pou\u017e\u00edvaj\u00ed MOVy nebo GDT k omezen\u00ed p\u0159ep\u011bt\u00ed a odveden\u00ed r\u00e1zov\u00e9ho proudu do zem\u011b.<\/p>\n<p><strong>Kl\u00ed\u010dov\u00e9 specifikace:<\/strong><\/p>\n<ul>\n<li>Jmenovit\u00e9 nap\u011bt\u00ed (Uc) mus\u00ed p\u0159ekro\u010dit maxim\u00e1ln\u00ed Voc syst\u00e9mu<\/li>\n<li>Maxim\u00e1ln\u00ed vyb\u00edjec\u00ed proud (Imax): 20kA-40kA pro SPD typu 2<\/li>\n<li>\u00darove\u0148 ochrany nap\u011bt\u00ed (Up) pod maxim\u00e1ln\u00edm vstupem st\u0159\u00edda\u010de<\/li>\n<\/ul>\n<p>SPD jsou ob\u011btovan\u00e1 za\u0159\u00edzen\u00ed vy\u017eaduj\u00edc\u00ed kontrolu po p\u0159ep\u011b\u0165ov\u00fdch ud\u00e1lostech.<\/p>\n<figure style=\"margin: 20px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/viox-pv-combiner-box-cutaway-diagram-showing-dc-mcb-gpv-fuses-dc-spd-internal-components-busbars-and-proper-dc-protection-device-configuration-for-solar-systems.webp\" alt=\"VIOX PV combiner box cutaway diagram showing DC MCB gPV fuses DC SPD internal components busbars and proper DC protection device configuration for solar systems\" \/><figcaption style=\"font-style: italic; font-size: 0.9em; color: #666; margin-top: 8px;\">Rozkreslen\u00fd diagram slu\u010dovac\u00ed sk\u0159\u00edn\u011b VIOX PV zobrazuj\u00edc\u00ed DC jisti\u010de, gPV pojistky, DC SPD vnit\u0159n\u00ed komponenty, p\u0159\u00edpojnice a spr\u00e1vnou konfiguraci DC ochrann\u00fdch za\u0159\u00edzen\u00ed pro sol\u00e1rn\u00ed syst\u00e9my<\/figcaption><\/figure>\n<p><strong>Tabulka 2: Matice v\u00fdb\u011bru komponent \u2013 Kam kter\u00e9 za\u0159\u00edzen\u00ed pat\u0159\u00ed<\/strong><\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\" border=\"1\">\n<thead>\n<tr style=\"background-color: #f9f9f9;\">\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Um\u00edst\u011bn\u00ed<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Nadproudov\u00e1 ochrana<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Ochrana proti zp\u011btn\u00e9mu proudu<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">P\u0159ep\u011b\u0165ov\u00e1 ochrana<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Monitorov\u00e1n\u00ed \u00faniku\/izolace<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>\u00darove\u0148 stringu<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Voliteln\u00e9 (pokud &gt;3 paraleln\u00ed stringy)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>gPV pojistka (povinn\u00e1)<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Voliteln\u00e9 (string SPD)<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>V\u00fdstup slu\u010dovac\u00ed sk\u0159\u00edn\u011b<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>DC MCB (povinn\u00fd)<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2014<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>DC SPD (povinn\u00fd)<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>DC vstup st\u0159\u00edda\u010de<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Integrov\u00e1no ve st\u0159\u00edda\u010di<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Integrov\u00e1no ve st\u0159\u00edda\u010di<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">M\u016f\u017ee m\u00edt SPD typu 2<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>RCMU\/ISO monitoring<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>AC v\u00fdstup st\u0159\u00edda\u010de<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">AC MCB\/MCCB<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u2014<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">AC SPD<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>RCD typu A nebo typu B<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"margin: 20px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/viox-solar-combiner-box-installation-with-dc-protection-equipment-mounted-on-pv-array-racking-system-showing-professional-photovoltaic-dc-disconnect-and-overcurrent-protection.webp\" alt=\"VIOX solar combiner box installation with DC protection equipment mounted on PV array racking system showing professional photovoltaic DC disconnect and overcurrent protection\" \/><figcaption style=\"font-style: italic; font-size: 0.9em; color: #666; margin-top: 8px;\">Instalace sol\u00e1rn\u00ed slu\u010dovac\u00ed sk\u0159\u00edn\u011b VIOX s DC ochrann\u00fdmi prvky namontovan\u00fdmi na nosn\u00e9m syst\u00e9mu fotovoltaick\u00fdch panel\u016f, zobrazuj\u00edc\u00ed profesion\u00e1ln\u00ed fotovoltaick\u00e9 DC odpojen\u00ed a nadproudovou ochranu<\/figcaption><\/figure>\n<h2>Kde skute\u010dn\u011b doch\u00e1z\u00ed k ochran\u011b proti \u00faniku: \u00daloha st\u0159\u00edda\u010de<\/h2>\n<p>Pokud neinstalujete RCD na DC stran\u011b, odkud poch\u00e1z\u00ed ochrana proti \u00faniku? Odpov\u011b\u010f: modern\u00ed st\u0159\u00edda\u010de p\u0159ipojen\u00e9 k s\u00edti.<\/p>\n<h3>RCMU: Jednotka pro monitorov\u00e1n\u00ed zbytkov\u00e9ho proudu<\/h3>\n<p>Modern\u00ed st\u0159\u00edda\u010de integruj\u00ed RCMU (jednotku pro monitorov\u00e1n\u00ed zbytkov\u00e9ho proudu), kter\u00e1 monitoruje AC a DC zbytkov\u00e9 proudy. Na rozd\u00edl od RCD, kter\u00e9 mechanicky vyp\u00ednaj\u00ed, RCMU signalizuj\u00ed st\u0159\u00edda\u010di, aby se vypnul, kdy\u017e jsou detekov\u00e1ny poruchy.<\/p>\n<p><strong>Provozn\u00ed prahy RCMU:<\/strong><\/p>\n<ul>\n<li>N\u00e1hl\u00e1 zm\u011bna \u226530mA spust\u00ed vypnut\u00ed do 0,3 sekundy<\/li>\n<li>Kontinu\u00e1ln\u00ed \u00fanik \u2265300mA spust\u00ed vypnut\u00ed<\/li>\n<li>Selh\u00e1n\u00ed autotestu zabr\u00e1n\u00ed spu\u0161t\u011bn\u00ed st\u0159\u00edda\u010de<\/li>\n<\/ul>\n<p><strong>ISO Monitoring:<\/strong> St\u0159\u00edda\u010de testuj\u00ed izola\u010dn\u00ed odpor p\u0159ed p\u0159ipojen\u00edm k s\u00edti ka\u017ed\u00e9 r\u00e1no. Pokud je pod 1 megaohm, st\u0159\u00edda\u010d odm\u00edtne pracovat. Pokro\u010dil\u00e9 modely nab\u00edzej\u00ed monitorov\u00e1n\u00ed v re\u00e1ln\u00e9m \u010dase.<\/p>\n<p>Tyto integrovan\u00e9 ochrany \u0159e\u0161\u00ed p\u0159esn\u011b tu funkci, kterou se instala\u010dn\u00ed technici myln\u011b sna\u017e\u00ed dos\u00e1hnout pomoc\u00ed RCD na DC stran\u011b \u2013 ale s technologi\u00ed speci\u00e1ln\u011b navr\u017eenou pro detekci DC poruch.<\/p>\n<h3>AC strana RCD: Jedin\u00e9 m\u00edsto, kam RCD pat\u0159\u00ed<\/h3>\n<p>RCD maj\u00ed v sol\u00e1rn\u00edch syst\u00e9mech roli: na AC v\u00fdstupn\u00ed stran\u011b, pot\u00e9, co st\u0159\u00edda\u010d p\u0159evede DC na AC.<\/p>\n<p><strong>Um\u00edst\u011bn\u00ed:<\/strong> Mezi AC v\u00fdstupem st\u0159\u00edda\u010de a hlavn\u00edm elektrick\u00fdm panelem.<\/p>\n<p><strong>V\u00fdb\u011br typu z\u00e1vis\u00ed na konstrukci st\u0159\u00edda\u010de:<\/strong><\/p>\n<p><strong>Tabulka 3: Po\u017eadavky na RCD na AC stran\u011b podle typu st\u0159\u00edda\u010de<\/strong><\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\" border=\"1\">\n<thead>\n<tr style=\"background-color: #f9f9f9;\">\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Typ st\u0159\u00edda\u010de<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">DC-AC izolace<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Riziko hladk\u00e9ho DC \u00faniku<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Po\u017eadovan\u00fd typ RCD<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Zd\u016fvodn\u011bn\u00ed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>Izolovan\u00fd (s transform\u00e1torem)<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Galvanick\u00e9 odd\u011blen\u00ed<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u017d\u00e1dn\u00fd<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>Typ A<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Transform\u00e1tor blokuje DC poruchy v dosa\u017een\u00ed AC strany<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>Neizolovan\u00fd (bez transform\u00e1toru)<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">\u017d\u00e1dn\u00e9 odd\u011blen\u00ed<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Vysok\u00e1<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\"><strong>Typ B<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">DC poruchy mohou unikat na AC stranu; Typ A by se nasytil<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Pro\u010d typ B pro st\u0159\u00edda\u010de bez transform\u00e1toru:<\/strong> Bez galvanick\u00e9ho odd\u011blen\u00ed mohou poruchy izolace na DC stran\u011b umo\u017enit hladk\u00fd DC proud do AC obvodu. RCD typu A toleruj\u00ed pouze 6mA DC p\u0159ed nasycen\u00edm. RCD typu B pou\u017e\u00edvaj\u00ed elektronick\u00e9 sn\u00edm\u00e1n\u00ed, kter\u00e9 z\u016fst\u00e1v\u00e1 funk\u010dn\u00ed i p\u0159i p\u0159\u00edtomnosti hladk\u00e9ho DC proudu.<\/p>\n<p><strong>V\u017edy se \u0159i\u010fte dokumentac\u00ed v\u00fdrobce.<\/strong> N\u011bkte\u0159\u00ed v\u00fdrobci (SolarEdge) povoluj\u00ed RCD typu A; jin\u00ed (SMA) vy\u017eaduj\u00ed typ B pro modely bez transform\u00e1toru. V p\u0159\u00edpad\u011b pochybnost\u00ed poskytuje typ B maxim\u00e1ln\u00ed ochranu.<\/p>\n<figure style=\"margin: 20px 0; text-align: center;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/viox-pv-system-topology-diagram-showing-dc-protection-architecture-from-solar-panels-through-gpv-fuses-dc-mcb-combiner-box-inverter-rcmu-monitoring-to-ac-side-type-b-rcd-protection.webp\" alt=\"VIOX PV system topology diagram showing DC protection architecture from solar panels through gPV fuses DC MCB combiner box inverter RCMU monitoring to AC-side Type B RCD protection\" \/><figcaption style=\"font-style: italic; font-size: 0.9em; color: #666; margin-top: 8px;\">Sch\u00e9ma topologie FV syst\u00e9mu VIOX zobrazuj\u00edc\u00ed architekturu DC ochrany od sol\u00e1rn\u00edch panel\u016f p\u0159es gPV pojistky DC MCB slu\u010dovac\u00ed sk\u0159\u00ed\u0148 st\u0159\u00edda\u010d RCMU monitoring a\u017e po AC stranu RCD typu B<\/figcaption><\/figure>\n<h2>B\u011b\u017en\u00e9 chyby konfigurace a opravy<\/h2>\n<p><strong>Tabulka 4: Nebezpe\u010dn\u00e9 chyby a spr\u00e1vn\u00e1 \u0159e\u0161en\u00ed<\/strong><\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\" border=\"1\">\n<thead>\n<tr style=\"background-color: #f9f9f9;\">\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Chyba<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Pro\u010d je to nebezpe\u010dn\u00e9<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Spr\u00e1vn\u00e9 \u0159e\u0161en\u00ed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Instalace RCD typu AC na DC vstup<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Nedok\u00e1\u017ee detekovat DC poruchy; nasyt\u00ed se a stane se slep\u00fdm ke v\u0161em poruch\u00e1m; kontakty nemohou bezpe\u010dn\u011b p\u0159eru\u0161it DC oblouk<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Pou\u017eijte DC MCB + gPV pojistky; spol\u00e9hejte se na RCMU st\u0159\u00edda\u010de pro detekci \u00faniku<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Pou\u017eit\u00ed pojistek s AC jmenovit\u00fdm proudem ve slu\u010dovac\u00ed sk\u0159\u00edni<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Nemaj\u00ed DC p\u0159eru\u0161ovac\u00ed schopnost; mohou explodovat p\u0159i pokusu o odstran\u011bn\u00ed DC poruchov\u00e9ho proudu<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">V\u017edy specifikujte pojistky s gPV jmenovit\u00fdm proudem (IEC 60269-6) se spr\u00e1vn\u00fdm DC nap\u011bt\u00edm<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">P\u0159edimenzov\u00e1n\u00ed pojistek \u201cpro budouc\u00ed roz\u0161\u00ed\u0159en\u00ed\u201d<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">30A pojistka na 10A stringu neochr\u00e1n\u00ed proti zp\u011btn\u00e9mu nadproudu; ma\u0159\u00ed \u00fa\u010del pojistky<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Dimenzujte pojistky podle NEC 690.9 (Isc \u00d7 1,56); zv\u011bt\u0161ete slu\u010dovac\u00ed sk\u0159\u00ed\u0148\/p\u0159\u00edpojnici m\u00edsto toho<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Vynech\u00e1n\u00ed SPD pro \u00fasporu n\u00e1klad\u016f<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">P\u0159echodn\u00e9 jevy indukovan\u00e9 bleskem zni\u010d\u00ed st\u0159\u00edda\u010de; poji\u0161t\u011bn\u00ed \u010dasto nepokryje nespr\u00e1vnou instalaci<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Nainstalujte DC SPD na v\u00fdstup slu\u010dova\u010de; zva\u017ete AC SPD i na panelu<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Pou\u017eit\u00ed RCD typu A se st\u0159\u00edda\u010dem bez transform\u00e1toru<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Typ A se nasyt\u00ed p\u0159i &gt;6mA hladk\u00e9ho DC proudu; nechr\u00e1n\u00ed proti AC poruch\u00e1m kontaminovan\u00fdm DC proudem<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Ov\u011b\u0159te typ st\u0159\u00edda\u010de; pro neizolovan\u00e9 konstrukce pou\u017eijte RCD typu B podle IEC 60364-7-712<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Instalace DC MCB bez ov\u011b\u0159en\u00ed DC jmenovit\u00e9 hodnoty<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">AC MCB katastrof\u00e1ln\u011b sel\u017eou p\u0159i p\u0159eru\u0161en\u00ed DC proudu; m\u016f\u017ee doj\u00edt ke sva\u0159en\u00ed kontakt\u016f nebo k explozi<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Ov\u011b\u0159te jasn\u00e9 ozna\u010den\u00ed \u201cDC\u201d a jmenovit\u00e9 nap\u011bt\u00ed \u2265 Voc syst\u00e9mu p\u0159i minim\u00e1ln\u00ed teplot\u011b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Kontroln\u00ed seznam specifikace za\u0159\u00edzen\u00ed<\/h2>\n<p>P\u0159ed n\u00e1kupem komponent pro v\u00e1\u0161 PV slu\u010dova\u010d ov\u011b\u0159te tyto specifikace:<\/p>\n<h3>DC MCB:<\/h3>\n<ul>\n<li>Jmenovit\u00e9 DC nap\u011bt\u00ed \u2265 Voc syst\u00e9mu p\u0159i nejni\u017e\u0161\u00ed okoln\u00ed teplot\u011b<\/li>\n<li>Jmenovit\u00fd proud \u2265 (celkov\u00fd Isc stringu \u00d7 1,25) \u00d7 1,25<\/li>\n<li>Jasn\u00e9 ozna\u010den\u00ed \u201cDC\u201d na za\u0159\u00edzen\u00ed<\/li>\n<li>Vyp\u00ednac\u00ed schopnost (Icu) \u2265 maxim\u00e1ln\u00ed p\u0159edpokl\u00e1dan\u00fd poruchov\u00fd proud<\/li>\n<\/ul>\n<h3>gPV Pojistky:<\/h3>\n<ul>\n<li>Ozna\u010den\u00ed klasifikace IEC 60269-6 gPV<\/li>\n<li>Jmenovit\u00fd proud = Isc \u00d7 1,56 zaokrouhleno na nejbli\u017e\u0161\u00ed standardn\u00ed velikost<\/li>\n<li>Jmenovit\u00e9 nap\u011bt\u00ed \u2265 1,2 \u00d7 Voc syst\u00e9mu<\/li>\n<li>Jmenovit\u00e1 hodnota nep\u0159ekra\u010duje maxim\u00e1ln\u00ed jmenovitou hodnotu s\u00e9riov\u00e9 pojistky modulu<\/li>\n<\/ul>\n<h3>DC SPD:<\/h3>\n<ul>\n<li>Jmenovit\u00e9 trval\u00e9 provozn\u00ed nap\u011bt\u00ed (Uc) \u2265 Voc syst\u00e9mu<\/li>\n<li>Klasifikace typu 2 minimum (typ 1, pokud nen\u00ed \u017e\u00e1dn\u00fd SPD p\u0159ed\u0159azen\u00fd)<\/li>\n<li>Maxim\u00e1ln\u00ed v\u00fdbojov\u00fd proud (Imax) \u2265 20kA<\/li>\n<li>\u00darove\u0148 nap\u011b\u0165ov\u00e9 ochrany (Up) pod maxim\u00e1ln\u00edm vstupn\u00edm nap\u011bt\u00edm st\u0159\u00edda\u010de<\/li>\n<\/ul>\n<h3>St\u0159\u00edda\u010d:<\/h3>\n<ul>\n<li>Integrovan\u00e1 RCMU nebo ekvivalentn\u00ed detekce DC poruchy<\/li>\n<li>Monitorov\u00e1n\u00ed izola\u010dn\u00edho odporu (ISO)<\/li>\n<li>Dokumentace specifikuje po\u017eadovan\u00fd typ RCD na AC stran\u011b<\/li>\n<\/ul>\n<h2>\u010casto Kladen\u00e9 Ot\u00e1zky<\/h2>\n<p><strong>Ot\u00e1zka: M\u016fj elektrik\u00e1\u0159 \u0159\u00edk\u00e1, \u017ee pro bezpe\u010dnost v\u017edy pou\u017e\u00edv\u00e1me RCD. Pro\u010d ne na DC stran\u011b?<\/strong><\/p>\n<p>Odpov\u011b\u010f: RCD jsou navr\u017eeny v\u00fdhradn\u011b pro st\u0159\u00eddav\u00fd proud. Jejich detek\u010dn\u00ed mechanismus se spol\u00e9h\u00e1 na zm\u011bny magnetick\u00fdch pol\u00ed, kter\u00e9 produkuje pouze AC. DC vytv\u00e1\u0159\u00ed st\u00e1l\u00fd magnetick\u00fd tok, kter\u00fd nasyt\u00ed j\u00e1dro RCD, tak\u017ee nen\u00ed schopen detekovat poruchy \u2013 AC nebo DC. Krom\u011b toho kontakty RCD nemohou bezpe\u010dn\u011b p\u0159eru\u0161it DC oblouky, kter\u00e9 postr\u00e1daj\u00ed p\u0159irozen\u00e9 pr\u016fchody nulou, kter\u00e9 AC poskytuje. Pou\u017eit\u00ed RCD na DC nen\u00ed \u201cextra bezpe\u010dnost\u201d \u2013 je to nefunk\u010dn\u00ed komponenta vytv\u00e1\u0159ej\u00edc\u00ed fale\u0161nou d\u016fv\u011bru.<\/p>\n<p><strong>Ot\u00e1zka: Mohu pou\u017e\u00edt RCD typu B na DC stran\u011b, proto\u017ee detekuje hladk\u00fd DC proud?<\/strong><\/p>\n<p>Odpov\u011b\u010f: RCD typu B detekuj\u00ed hladk\u00e9 DC rezidu\u00e1ln\u00ed proudy, ale jsou navr\u017eeny pro AC obvody s potenci\u00e1ln\u00ed DC kontaminac\u00ed (jako jsou v\u00fdstupy st\u0159\u00edda\u010de). Nenahrazuj\u00ed nadproudovou, zp\u011btnou proudovou a obloukovou ochranu, kterou poskytuj\u00ed DC MCB a gPV pojistky. A co je d\u016fle\u017eit\u011bj\u0161\u00ed, i RCD typu B mohou postr\u00e1dat DC vyp\u00ednac\u00ed schopnost a mechanismy zh\u00e1\u0161en\u00ed oblouku pot\u0159ebn\u00e9 pro vysokonap\u011b\u0165ov\u00e9 PV pole. Spr\u00e1vn\u00fd p\u0159\u00edstup je DC specifick\u00e1 ochrana na DC stran\u011b, s RCD typu B na AC v\u00fdstupu, pokud to vy\u017eaduje konstrukce st\u0159\u00edda\u010de.<\/p>\n<p><strong>Ot\u00e1zka: Co kdy\u017e m\u016fj slu\u010dova\u010d p\u0159i\u0161el s mont\u00e1\u017en\u00edm prostorem pro RCD?<\/strong><\/p>\n<p>Odpov\u011b\u010f: N\u011bkter\u00e9 importovan\u00e9 slu\u010dova\u010de obsahuj\u00ed univerz\u00e1ln\u00ed mont\u00e1\u017en\u00ed prostor pro DIN li\u0161tu, ani\u017e by byly navr\u017eeny pro konkr\u00e9tn\u00ed trhy nebo k\u00f3dy. Jen proto, \u017ee je tam fyzick\u00fd prostor, neznamen\u00e1 to, \u017ee byste m\u011bli instalovat RCD. Postupujte podle po\u017eadavk\u016f NEC \u010dl\u00e1nku 690 (Severn\u00ed Amerika) nebo IEC 62548 (mezin\u00e1rodn\u00ed): DC MCB, gPV pojistky a DC SPD. Nechte voln\u00fd prostor pr\u00e1zdn\u00fd nebo jej pou\u017eijte pro dal\u0161\u00ed pozice string\u016f, pokud to va\u0161e p\u0159\u00edpojnice podporuje.<\/p>\n<p><strong>Ot\u00e1zka: Jak pozn\u00e1m, zda m\u00e1 m\u016fj st\u0159\u00edda\u010d RCMU a ISO monitorov\u00e1n\u00ed?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Zkontrolujte datov\u00fd list st\u0159\u00edda\u010de nebo instala\u010dn\u00ed p\u0159\u00edru\u010dku. Modern\u00ed st\u0159\u00edda\u010de p\u0159ipojen\u00e9 k s\u00edti od renomovan\u00fdch v\u00fdrobc\u016f (SMA, Fronius, SolarEdge, Solis, Huawei atd.) zahrnuj\u00ed tyto funkce standardn\u011b, \u010dasto je uv\u00e1d\u011bj\u00ed v \u010d\u00e1sti \u201cBezpe\u010dnost\u201d nebo \u201cOchrann\u00e9 funkce\u201d. Hledejte term\u00edny jako \u201cResidual Current Monitoring Unit (RCMU)\u201d, \u201cInsulation Resistance Monitoring\u201d, \u201cGround Fault Detection\u201d nebo \u201cISO monitoring\u201d. Pokud tyto informace nem\u016f\u017eete naj\u00edt, kontaktujte v\u00fdrobce \u2013 jak\u00fdkoli st\u0159\u00edda\u010d prod\u00e1van\u00fd po roce 2015 pro p\u0159ipojen\u00ed k s\u00edti by m\u011bl m\u00edt integrovanou detekci DC poruchy.<\/p>\n<p><strong>Ot\u00e1zka: M\u016fj m\u00edstn\u00ed inspektor vy\u017eaduje RCD. Co mu m\u00e1m \u0159\u00edct?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Zeptejte se konkr\u00e9tn\u011b, kam by m\u011bla b\u00fdt RCD instalov\u00e1na. Pokud maj\u00ed na mysli AC v\u00fdstupn\u00ed stranu mezi st\u0159\u00edda\u010dem a hlavn\u00edm panelem, je to spr\u00e1vn\u011b \u2013 nainstalujte typ A nebo typ B podle specifikac\u00ed v\u00fdrobce st\u0159\u00edda\u010de. Pokud trvaj\u00ed na RCD na DC stran\u011b, zdvo\u0159ile se odvolejte na:<\/p>\n<ul>\n<li>NEC 690.41 (vy\u017eaduje ochranu syst\u00e9mu proti zemn\u00edmu spojen\u00ed, kterou poskytuje RCMU st\u0159\u00edda\u010de)<\/li>\n<li>NEC 690.9 (vy\u017eaduje DC nadproudovou ochranu prost\u0159ednictv\u00edm za\u0159\u00edzen\u00ed s DC jmenovitou hodnotou)<\/li>\n<li>IEC 62548 Odd\u00edl 8.2 (po\u017eadavky na ochranu DC obvodu \u2013 nezahrnuje RCD)<\/li>\n<li>IEC 60364-7-712 Odd\u00edl 712.413.1.1.1.2 (specifikuje RCD typu B pro AC stranu neizolovan\u00fdch syst\u00e9m\u016f)<\/li>\n<\/ul>\n<p>Poskytn\u011bte technickou dokumentaci st\u0159\u00edda\u010de, kter\u00e1 ukazuje integrovanou detekci poruch RCMU\/ISO. V\u011bt\u0161ina probl\u00e9m\u016f s kontrolou vznik\u00e1 z nejasnost\u00ed mezi po\u017eadavky na AC a DC stranu.<\/p>\n<p><strong>Ot\u00e1zka: Mohu si vyrobit sol\u00e1rn\u00ed slu\u010dova\u010d s\u00e1m, nebo bych si m\u011bl koupit p\u0159edem sestaven\u00fd?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Pokud si nejste jisti v\u00fdb\u011brem komponent nebo v\u00fdpo\u010dty dimenzov\u00e1n\u00ed, zakupte si p\u0159edem navr\u017een\u00fd slu\u010dova\u010d od VIOX Electric. Ty jsou dod\u00e1v\u00e1ny se spr\u00e1vn\u011b dimenzovan\u00fdmi DC MCB, dr\u017e\u00e1ky gPV pojistek, SPD a p\u0159\u00edpojnicemi. DIY je provediteln\u00e9 pouze tehdy, pokud d\u016fkladn\u011b rozum\u00edte po\u017eadavk\u016fm NEC 690\/IEC 62548 a m\u016f\u017eete z\u00edskat skute\u010dn\u011b DC dimenzovan\u00e9 komponenty.<\/p>\n<h2>Chra\u0148te svou investici spr\u00e1vnou DC ochranou<\/h2>\n<p>Z\u00e1v\u011br je jasn\u00fd: opus\u0165te AC elektrick\u00e9 my\u0161len\u00ed, kdy\u017e vstoup\u00edte do DC sv\u011bta fotovoltaick\u00fdch syst\u00e9m\u016f. RCD \u2013 a\u0165 u\u017e typu AC, A, F nebo dokonce B \u2013 nemaj\u00ed na DC vstupn\u00ed stran\u011b sol\u00e1rn\u00edch slu\u010dova\u010d\u016f co d\u011blat. Nemohou detekovat poruchy, na kter\u00fdch z\u00e1le\u017e\u00ed, oslep\u00ed se v\u016f\u010di n\u00e1sledn\u00fdm poruch\u00e1m a nemohou bezpe\u010dn\u011b p\u0159eru\u0161it DC oblouky.<\/p>\n<p>Spr\u00e1vn\u00e1 strategie ochrany se \u0159\u00edd\u00ed DC trojic\u00ed:<\/p>\n<ol>\n<li><strong>DC dimenzovan\u00fd MCB<\/strong> pro nadproudovou ochranu a ochranu proti zkratu<\/li>\n<li><strong>gPV dimenzovan\u00e9 pojistky<\/strong> pro ochranu proti zp\u011btn\u00e9mu proudu na \u00farovni stringu<\/li>\n<li><strong>DC SPD<\/strong> pro ochranu proti blesku a p\u0159ep\u011bt\u00ed<\/li>\n<\/ol>\n<p>Monitorov\u00e1n\u00ed \u00faniku a izola\u010dn\u00ed poruchy prob\u00edh\u00e1 uvnit\u0159 st\u0159\u00edda\u010de prost\u0159ednictv\u00edm syst\u00e9m\u016f RCMU a ISO speci\u00e1ln\u011b navr\u017een\u00fdch pro detekci DC poruch. Na AC v\u00fdstupn\u00ed stran\u011b \u2013 a pouze tam \u2013 nainstalujte p\u0159\u00edslu\u0161n\u00fd RCD typu A nebo typu B podle specifikac\u00ed v\u00fdrobce st\u0159\u00edda\u010de.<\/p>\n<p>VIOX Electric vyr\u00e1b\u00ed kompletn\u00ed \u0159ady PV slu\u010dova\u010d\u016f, DC dimenzovan\u00fdch MCB, gPV pojistek a DC SPD navr\u017een\u00fdch tak, aby spl\u0148ovaly normy NEC i IEC. Na\u0161e p\u0159edkonfigurovan\u00e9 slu\u010dova\u010de eliminuj\u00ed dohady p\u0159i v\u00fdb\u011bru a dimenzov\u00e1n\u00ed komponent. Pro technickou podporu, v\u00fdpo\u010dty dimenzov\u00e1n\u00ed nebo produktov\u00e9 listy nav\u0161tivte <a href=\"https:\/\/test.viox.com\/cs\/\">VIOX.com<\/a> nebo kontaktujte na\u0161e specialisty na sol\u00e1rn\u00ed ochranu. Nenechte AC p\u0159edpoklady ohrozit va\u0161i DC bezpe\u010dnost.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A Reddit user asked a seemingly innocent question: &#8220;Should I install an RCD (residual current device) on the DC input side of my solar combiner box for extra safety?&#8221; Within minutes, licensed electricians and solar engineers flooded the thread with urgent warnings: Don&#8217;t do it. This is dangerous. The answer reveals a critical misconception that [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20852,"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-20850","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\/20850","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=20850"}],"version-history":[{"count":2,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/20850\/revisions"}],"predecessor-version":[{"id":20853,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/20850\/revisions\/20853"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media\/20852"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media?parent=20850"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/categories?post=20850"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/tags?post=20850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}