{"id":21492,"date":"2026-01-30T23:26:36","date_gmt":"2026-01-30T15:26:36","guid":{"rendered":"https:\/\/viox.com\/?p=21492"},"modified":"2026-01-30T23:29:43","modified_gmt":"2026-01-30T15:29:43","slug":"circuit-breaker-i2t-permissible-energy-curve-guide","status":"publish","type":"post","link":"https:\/\/test.viox.com\/cs\/circuit-breaker-i2t-permissible-energy-curve-guide\/","title":{"rendered":"Pochopen\u00ed I\u00b2t: Jak \u010d\u00edst a pou\u017e\u00edvat p\u0159\u00edpustn\u00e9 energetick\u00e9 k\u0159ivky jisti\u010d\u016f"},"content":{"rendered":"<div class=\"product-intro\">\n<h2>P\u0159\u00edm\u00e1 odpov\u011b\u010f<\/h2>\n<p>K\u0159ivka I\u00b2t (p\u0159\u00edpustn\u00e1 energie) jisti\u010de ukazuje tepelnou energii, kter\u00e1 proch\u00e1z\u00ed b\u011bhem p\u0159eru\u0161en\u00ed poruchy. \u010cten\u00ed t\u00e9to k\u0159ivky je jednoduch\u00e9: najd\u011bte sv\u016fj potenci\u00e1ln\u00ed zkratov\u00fd proud na ose X, sledujte svisle nahoru k pr\u016fse\u010d\u00edku s k\u0159ivkou jisti\u010de a pot\u00e9 ode\u010dt\u011bte odpov\u00eddaj\u00edc\u00ed hodnotu I\u00b2t na ose Y. Tato hodnota mus\u00ed b\u00fdt men\u0161\u00ed ne\u017e tepeln\u00e1 odolnost va\u0161eho vodi\u010de (K\u00b2S\u00b2), aby byl zaji\u0161t\u011bn bezpe\u010dn\u00fd provoz. Nap\u0159\u00edklad proudov\u011b omezuj\u00edc\u00ed jisti\u010d 160A, kter\u00fd p\u0159eru\u0161uje poruchu 100kA, typicky omezuje I\u00b2t na p\u0159ibli\u017en\u011b 0,48\u00d710\u2076 A\u00b2s, \u010d\u00edm\u017e zabra\u0148uje tepeln\u00e9mu po\u0161kozen\u00ed kabel\u016f a p\u0159\u00edpojnic, ke kter\u00e9mu by jinak do\u0161lo b\u011bhem milisekund.<\/p>\n<hr \/>\n<h2>Co je I\u00b2t a pro\u010d je d\u016fle\u017eit\u00e9 pro elektrickou bezpe\u010dnost<\/h2>\n<p>Kdy\u017e dojde k zkratov\u00e9 poru\u0161e v elektrick\u00e9m syst\u00e9mu, masivn\u00ed proudov\u00fd n\u00e1r\u016fst generuje intenzivn\u00ed teplo prost\u0159ednictv\u00edm efektu I\u00b2R. Celkov\u00e1 tepeln\u00e1 energie absorbovan\u00e1 vodi\u010di z\u00e1vis\u00ed jak na velikosti proudu, tak na dob\u011b trv\u00e1n\u00ed, ne\u017e ochrann\u00e9 za\u0159\u00edzen\u00ed odstran\u00ed poruchu. Tento vztah je vyj\u00e1d\u0159en jako I\u00b2t \u2013 integr\u00e1l \u010dtverce proudu v \u010dase, m\u011b\u0159en\u00fd v amp\u00e9r-\u010dtverec sekund\u00e1ch (A\u00b2s).<\/p>\n<p>Proudov\u011b omezuj\u00edc\u00ed jisti\u010de maj\u00ed z\u00e1sadn\u00ed v\u00fdhodu: dramaticky sni\u017euj\u00ed jak \u0161pi\u010dkov\u00fd proud, tak dobu vypnut\u00ed b\u011bhem poruch. Podle norem IEC 60947-1 k\u0159ivka p\u0159\u00edpustn\u00e9 energie (tak\u00e9 naz\u00fdvan\u00e1 k\u0159ivka propu\u0161t\u011bn\u00e9 energie) kvantifikuje, jak velk\u00e9mu tepeln\u00e9mu nam\u00e1h\u00e1n\u00ed jisti\u010d umo\u017e\u0148uje, aby byly vystaveny vodi\u010de za n\u00edm. Pochopen\u00ed a aplikace t\u011bchto k\u0159ivek zabra\u0148uje p\u0159eh\u0159\u00e1t\u00ed vodi\u010d\u016f, po\u0161kozen\u00ed izolace a potenci\u00e1ln\u00edm rizik\u016fm po\u017e\u00e1ru v elektrick\u00fdch instalac\u00edch.<\/p>\n<p>Modern\u00ed elektrick\u00e9 syst\u00e9my se st\u00e1le v\u00edce spol\u00e9haj\u00ed na men\u0161\u00ed pr\u016f\u0159ezy vodi\u010d\u016f pro efektivitu n\u00e1klad\u016f, tak\u017ee tepeln\u00e1 ochrana je d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e kdy d\u0159\u00edve. Standardn\u00ed PVC kabel 10 mm\u00b2 vydr\u017e\u00ed pouze 1,32\u00d710\u2076 A\u00b2s p\u0159ed selh\u00e1n\u00edm izolace, ale jisti\u010d bez omezen\u00ed proudu by mohl propustit n\u011bkolikr\u00e1t v\u00edce energie b\u011bhem poruchy s vysokou magnitudou.<\/p>\n<hr \/>\n<h2>Jak proudov\u011b omezuj\u00edc\u00ed jisti\u010de sni\u017euj\u00ed tepeln\u00e9 nam\u00e1h\u00e1n\u00ed<\/h2>\n<h3>Fyzika omezen\u00ed proudu<\/h3>\n<p>Proudov\u011b omezuj\u00edc\u00ed jisti\u010de vyu\u017e\u00edvaj\u00ed rychl\u00e9 odd\u011blen\u00ed kontakt\u016f v kombinaci se specializovan\u00fdmi zh\u00e1\u0161ec\u00edmi komorami oblouku. Kdy\u017e za\u010dne prot\u00e9kat poruchov\u00fd proud, kontakty jisti\u010de se otev\u0159ou b\u011bhem 2-5 milisekund \u2013 \u010dasto d\u0159\u00edve, ne\u017e poruchov\u00fd proud dos\u00e1hne sv\u00e9ho prvn\u00edho potenci\u00e1ln\u00edho vrcholu. Nap\u011bt\u00ed oblouku vytvo\u0159en\u00e9 b\u011bhem p\u0159eru\u0161en\u00ed p\u016fsob\u00ed proti nap\u011bt\u00ed syst\u00e9mu, \u010d\u00edm\u017e \u00fa\u010dinn\u011b vkl\u00e1d\u00e1 impedanci do cesty poruchy a \u201csek\u00e1\u201d proudov\u00fd pr\u016fb\u011bh.<\/p>\n<p>Tato proudov\u011b omezuj\u00edc\u00ed akce produkuje dv\u011b m\u011b\u0159iteln\u00e9 v\u00fdhody zachycen\u00e9 v datov\u00fdch listech v\u00fdrobce: \u0161pi\u010dkov\u00fd propu\u0161t\u011bn\u00fd proud (Ip) a propu\u0161t\u011bn\u00e1 energie (I\u00b2t). Zat\u00edmco \u0161pi\u010dkov\u00fd proud ur\u010duje mechanick\u00e9 nam\u00e1h\u00e1n\u00ed p\u0159\u00edpojnic, hodnota I\u00b2t \u0159\u00edd\u00ed tepeln\u00e9 nam\u00e1h\u00e1n\u00ed v\u0161ech vodi\u010d\u016f v cest\u011b poruchy.<\/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-current-limiting-circuit-breaker-with-visible-arc-chute-chamber-for-thermal-energy-reduction.webp\" alt=\"VIOX current-limiting circuit breaker with visible arc-chute chamber for thermal energy reduction\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 1: Proudov\u011b omezuj\u00edc\u00ed jisti\u010d VIOX s viditelnou obloukovou komorou navr\u017eenou pro sn\u00ed\u017een\u00ed tepeln\u00e9 energie.<\/figcaption><\/figure>\n<h3>Porovn\u00e1n\u00ed omezen\u00e9 vs. neomezen\u00e9 poruchov\u00e9 energie<\/h3>\n<p>Uva\u017eujme potenci\u00e1ln\u00ed zkrat 100kA v syst\u00e9mu chr\u00e1n\u011bn\u00e9m r\u016fzn\u00fdmi za\u0159\u00edzen\u00edmi:<\/p>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Ochrann\u00e9 za\u0159\u00edzen\u00ed<\/th>\n<th>Doba zh\u00e1\u0161en\u00ed<\/th>\n<th>\u0160pi\u010dkov\u00fd proud<\/th>\n<th>Hodnota I\u00b2t<\/th>\n<th>Zv\u00fd\u0161en\u00ed teploty (p\u0159\u00edpojnice 100\u00d710mm)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u017d\u00e1dn\u00e1 ochrana<\/td>\n<td>NEUPLAT\u0147UJE SE<\/td>\n<td>141 kA \u0161pi\u010dka<\/td>\n<td>Katastrof\u00e1ln\u00ed<\/td>\n<td>Odpa\u0159ov\u00e1n\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Standardn\u00ed MCCB (kr\u00e1tkodob\u00e9 zpo\u017ed\u011bn\u00ed)<\/td>\n<td>500 ms<\/td>\n<td>100 kA RMS<\/td>\n<td>~5\u00d710\u2079 A\u00b2s<\/td>\n<td>&gt;500\u00b0C (selh\u00e1n\u00ed)<\/td>\n<\/tr>\n<tr>\n<td>Proudov\u011b omezuj\u00edc\u00ed MCCB (160A)<\/td>\n<td>8 ms<\/td>\n<td>42 kA \u0161pi\u010dka<\/td>\n<td>0,48\u00d710\u2076 A\u00b2s<\/td>\n<td>71\u00b0C (bezpe\u010dn\u00e9)<\/td>\n<\/tr>\n<tr>\n<td>Proudov\u011b omezuj\u00edc\u00ed pojistka (160A)<\/td>\n<td>4 ms<\/td>\n<td>38 kA \u0161pi\u010dka<\/td>\n<td>0,35\u00d710\u2076 A\u00b2s<\/td>\n<td>70,5\u00b0C (bezpe\u010dn\u00e9)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Toto srovn\u00e1n\u00ed ukazuje, pro\u010d je proudov\u011b omezuj\u00edc\u00ed ochrana nezbytn\u00e1 pro modern\u00ed instalace s vysok\u00fdmi dostupn\u00fdmi poruchov\u00fdmi proudy. Sn\u00ed\u017een\u00ed I\u00b2t o t\u0159i a\u017e \u010dty\u0159i \u0159\u00e1dy transformuje katastrofickou tepelnou ud\u00e1lost na zvl\u00e1dnuteln\u00e9 zv\u00fd\u0161en\u00ed teploty.<\/p>\n<hr \/>\n<h2>\u010cten\u00ed k\u0159ivek I\u00b2t: Pr\u016fvodce krok za krokem<\/h2>\n<h3>Pochopen\u00ed form\u00e1tu k\u0159ivky<\/h3>\n<p>Datov\u00e9 listy v\u00fdrobce prezentuj\u00ed k\u0159ivky I\u00b2t na logaritmick\u00fdch stupnic\u00edch s potenci\u00e1ln\u00edm zkratov\u00fdm proudem (osa X) vyneseny proti propu\u0161t\u011bn\u00e9 energii (osa Y). Na jednom grafu se typicky objevuje v\u00edce k\u0159ivek, kter\u00e9 reprezentuj\u00ed r\u016fzn\u00e9 velikosti r\u00e1mu jisti\u010de nebo jmenovit\u00e9 hodnoty v r\u00e1mci produktov\u00e9 \u0159ady.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Annotated-It-curve-diagram-showing-how-to-determine-let-through-energy-for-VIOX-circuit-breakers.webp\" alt=\"Annotated I\u00b2t curve diagram showing how to determine let-through energy for VIOX circuit breakers\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 2: Anotovan\u00fd diagram k\u0159ivky I\u00b2t ilustruj\u00edc\u00ed proces ur\u010den\u00ed propu\u0161t\u011bn\u00e9 energie pro jisti\u010de VIOX.<\/figcaption><\/figure>\n<h3>P\u011bt krok\u016f k aplikaci k\u0159ivek I\u00b2t<\/h3>\n<p><strong>Krok 1: Vypo\u010d\u00edtat potenci\u00e1ln\u00ed zkratov\u00fd proud<\/strong><br \/>\nUr\u010dete maxim\u00e1ln\u00ed dostupn\u00fd poruchov\u00fd proud v m\u00edst\u011b instalace pomoc\u00ed v\u00fdpo\u010dt\u016f impedance syst\u00e9mu podle IEC 60909 nebo ekvivalentn\u00edch norem. To p\u0159edstavuje proud, kter\u00fd by tekl, pokud by byl jisti\u010d nahrazen pevn\u00fdm vodi\u010dem.<\/p>\n<p><strong>Krok 2: Naj\u00edt proud na ose X<\/strong><br \/>\nNajd\u011bte vypo\u010d\u00edtanou hodnotu potenci\u00e1ln\u00edho proudu na vodorovn\u00e9 ose grafu k\u0159ivky I\u00b2t. Pokud va\u0161e hodnota spad\u00e1 mezi m\u0159\u00ed\u017eky, interpolujte logaritmicky nebo pou\u017eijte dal\u0161\u00ed vy\u0161\u0161\u00ed hodnotu pro konzervativn\u00ed v\u00fdsledky.<\/p>\n<p><strong>Krok 3: Sledovat svisle ke k\u0159ivce jisti\u010de<\/strong><br \/>\nNakreslete si pomyslnou svislou \u010d\u00e1ru nahoru od va\u0161\u00ed hodnoty proudu, dokud se neprotne s k\u0159ivkou odpov\u00eddaj\u00edc\u00ed jmenovit\u00e9 hodnot\u011b va\u0161eho konkr\u00e9tn\u00edho jisti\u010de. R\u016fzn\u00e9 jmenovit\u00e9 hodnoty amp\u00e9r maj\u00ed odli\u0161n\u00e9 k\u0159ivky \u2013 ujist\u011bte se, \u017ee \u010dtete spr\u00e1vnou.<\/p>\n<p><strong>Krok 4: Ode\u010d\u00edst hodnotu I\u00b2t na ose Y<\/strong><br \/>\nZ bodu pr\u016fse\u010d\u00edku sledujte vodorovn\u011b k lev\u00e9 ose Y a ode\u010dt\u011bte hodnotu propu\u0161t\u011bn\u00e9 energie. Pe\u010dliv\u011b si v\u0161\u00edmejte jednotek \u2013 hodnoty jsou typicky vyj\u00e1d\u0159eny jako A\u00b2s \u00d7 10\u2076 nebo podobn\u00fd v\u011bdeck\u00fd z\u00e1pis.<\/p>\n<p><strong>Krok 5: Porovnat s odolnost\u00ed vodi\u010de<\/strong><br \/>\nOv\u011b\u0159te, \u017ee hodnota I\u00b2t jisti\u010de je men\u0161\u00ed ne\u017e maxim\u00e1ln\u00ed tepeln\u00e1 odolnost vodi\u010de pomoc\u00ed vzorce K\u00b2S\u00b2 (vysv\u011btleno v dal\u0161\u00ed \u010d\u00e1sti).<\/p>\n<h3>B\u011b\u017en\u00e9 chyby p\u0159i \u010dten\u00ed, kter\u00fdm je t\u0159eba se vyhnout<\/h3>\n<p>In\u017een\u00fd\u0159i se \u010dasto dopou\u0161t\u011bj\u00ed t\u0159\u00ed kritick\u00fdch chyb p\u0159i interpretaci k\u0159ivek I\u00b2t:<\/p>\n<p><strong>Zam\u011b\u0148ov\u00e1n\u00ed hodnot RMS a \u0161pi\u010dkov\u00fdch hodnot<\/strong>: Osa X ukazuje potenci\u00e1ln\u00ed RMS symetrick\u00fd proud, nikoli \u0161pi\u010dkov\u00fd asymetrick\u00fd proud. Pou\u017eit\u00ed \u0161pi\u010dkov\u00fdch hodnot v\u00e1s um\u00edst\u00ed nespr\u00e1vn\u011b na k\u0159ivku, co\u017e typicky vede k p\u0159\u00edli\u0161 optimistick\u00fdm hodnot\u00e1m I\u00b2t.<\/p>\n<p><strong>Neshoduj\u00edc\u00ed se jmenovit\u00e9 hodnoty jisti\u010de<\/strong>: Produktov\u00e9 \u0159ady \u010dasto zobrazuj\u00ed v\u00edce k\u0159ivek na jednom grafu. V\u017edy ov\u011b\u0159te, \u017ee \u010dtete k\u0159ivku, kter\u00e1 odpov\u00edd\u00e1 jmenovit\u00e9 hodnot\u011b amp\u00e9r a vyp\u00ednac\u00ed schopnosti va\u0161eho instalovan\u00e9ho jisti\u010de (nap\u0159. jisti\u010d s k\u0159ivkou \u201cC\u201d 10kA se li\u0161\u00ed od jisti\u010de s k\u0159ivkou \u201cN\u201d 36kA se stejnou amp\u00e9r\u00e1\u017e\u00ed).<\/p>\n<p><strong>Ignorov\u00e1n\u00ed logaritmick\u00e9ho m\u011b\u0159\u00edtka<\/strong>: Ob\u011b osy pou\u017e\u00edvaj\u00ed logaritmick\u00e9 stupnice. Mal\u00e1 vizu\u00e1ln\u00ed vzd\u00e1lenost na grafu p\u0159edstavuje velkou numerickou zm\u011bnu. V\u017edy pe\u010dliv\u011b ode\u010d\u00edtejte hodnoty z popisk\u016f os, sp\u00ed\u0161e ne\u017e abyste je vizu\u00e1ln\u011b odhadovali.<\/p>\n<hr \/>\n<h2>V\u00fdpo\u010det tepeln\u00e9 odolnosti vodi\u010de<\/h2>\n<h3>Vysv\u011btlen\u00ed vzorce K\u00b2S\u00b2<\/h3>\n<p>Ka\u017ed\u00fd vodi\u010d m\u00e1 maxim\u00e1ln\u00ed tepelnou energii, kterou m\u016f\u017ee absorbovat, ne\u017e dojde k po\u0161kozen\u00ed izolace. Tento limit je vyj\u00e1d\u0159en adiabatickou rovnic\u00ed:<\/p>\n<p><strong>I\u00b2t \u2264 K\u00b2S\u00b2<\/strong><\/p>\n<p>Kde:<\/p>\n<ul>\n<li><strong>I\u00b2t<\/strong> = Propu\u0161t\u011bn\u00e1 energie z ochrann\u00e9ho za\u0159\u00edzen\u00ed (A\u00b2s)<\/li>\n<li><strong>K<\/strong> = Konstanta materi\u00e1lu a izolace (A\u00b7s\u00bd\/mm\u00b2)<\/li>\n<li><strong>S<\/strong> = Pr\u016f\u0159ez vodi\u010de (mm\u00b2)<\/li>\n<\/ul>\n<p>Konstanta K zohled\u0148uje materi\u00e1l vodi\u010de (m\u011b\u010f nebo hlin\u00edk), typ izolace (PVC, XLPE, EPR), po\u010d\u00e1te\u010dn\u00ed teplotu (typicky 70 \u00b0C pro trval\u00fd provoz) a kone\u010dnou p\u0159\u00edpustnou teplotu (160 \u00b0C pro PVC, 250 \u00b0C pro XLPE). IEC 60364-5-54 poskytuje standardizovan\u00e9 hodnoty K.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Cable-cross-section-diagram-illustrating-thermal-withstand-capacity-calculation-parameters.webp\" alt=\"Cable cross-section diagram illustrating thermal withstand capacity calculation parameters\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 3: Sch\u00e9ma pr\u016f\u0159ezu kabelu ilustruj\u00edc\u00ed parametry v\u00fdpo\u010dtu tepeln\u00e9 odolnosti.<\/figcaption><\/figure>\n<h3>Standardn\u00ed hodnoty K pro b\u011b\u017en\u00e9 vodi\u010de<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Materi\u00e1l vodi\u010de<\/th>\n<th>Typ izolace<\/th>\n<th>Po\u010d\u00e1te\u010dn\u00ed teplota<\/th>\n<th>Kone\u010dn\u00e1 teplota<\/th>\n<th>Hodnota K (A\u00b7s\u00bd\/mm\u00b2)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M\u011b\u010f<\/td>\n<td>PVC<\/td>\n<td>70 \u00b0C<\/td>\n<td>160 \u00b0C<\/td>\n<td>115<\/td>\n<\/tr>\n<tr>\n<td>M\u011b\u010f<\/td>\n<td>XLPE\/EPR<\/td>\n<td>90 \u00b0C<\/td>\n<td>250 \u00b0C<\/td>\n<td>143<\/td>\n<\/tr>\n<tr>\n<td>M\u011b\u010f<\/td>\n<td>Miner\u00e1ln\u00ed (PVC)<\/td>\n<td>70 \u00b0C<\/td>\n<td>160 \u00b0C<\/td>\n<td>115<\/td>\n<\/tr>\n<tr>\n<td>Hlin\u00edk<\/td>\n<td>PVC<\/td>\n<td>70 \u00b0C<\/td>\n<td>160 \u00b0C<\/td>\n<td>76<\/td>\n<\/tr>\n<tr>\n<td>Hlin\u00edk<\/td>\n<td>XLPE\/EPR<\/td>\n<td>90 \u00b0C<\/td>\n<td>250 \u00b0C<\/td>\n<td>94<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Praktick\u00fd p\u0159\u00edklad v\u00fdpo\u010dtu<\/h3>\n<p><strong>Sc\u00e9n\u00e1\u0159<\/strong>: Ov\u011b\u0159te, zda jisti\u010d VIOX NSX160F (vyp\u00ednac\u00ed schopnost 36 kA) adekv\u00e1tn\u011b chr\u00e1n\u00ed m\u011bd\u011bn\u00fd vodi\u010d o pr\u016f\u0159ezu 10 mm\u00b2 s PVC izolac\u00ed, kde je p\u0159edpokl\u00e1dan\u00fd poruchov\u00fd proud 25 kA.<\/p>\n<p><strong>Krok 1<\/strong>: Zjist\u011bte I\u00b2t jisti\u010de z k\u0159ivky v\u00fdrobce<\/p>\n<ul>\n<li>P\u0159edpokl\u00e1dan\u00fd proud: 25 kA<\/li>\n<li>Z datasheetu VIOX NSX160F: I\u00b2t = 6\u00d710\u2075 A\u00b2s<\/li>\n<\/ul>\n<p><strong>Krok 2<\/strong>: Vypo\u010d\u00edtejte tepelnou odolnost kabelu<\/p>\n<ul>\n<li>K = 115 (m\u011b\u010f PVC, z tabulky v\u00fd\u0161e)<\/li>\n<li>S = 10 mm\u00b2<\/li>\n<li>K\u00b2S\u00b2 = 115\u00b2 \u00d7 10\u00b2 = 1.32\u00d710\u2076 A\u00b2s<\/li>\n<\/ul>\n<p><strong>Krok 3<\/strong>: Ov\u011b\u0159te ochranu<\/p>\n<ul>\n<li>I\u00b2t jisti\u010de (6\u00d710\u2075) &lt; K\u00b2S\u00b2 kabelu (1.32\u00d710\u2076) \u2713<\/li>\n<li>Bezpe\u010dnostn\u00ed rezerva: (1.32 \u2013 0.6) \/ 1.32 = 54.51%<\/li>\n<\/ul>\n<p><strong>Z\u00e1v\u011br<\/strong>: Kabel je adekv\u00e1tn\u011b chr\u00e1n\u011bn s podstatnou bezpe\u010dnostn\u00ed rezervou.<\/p>\n<hr \/>\n<h2>Tepeln\u00e9 ov\u011b\u0159en\u00ed p\u0159\u00edpojnic pomoc\u00ed I\u00b2t<\/h2>\n<h3>Pro\u010d p\u0159\u00edpojnice vy\u017eaduj\u00ed zvl\u00e1\u0161tn\u00ed pozornost<\/h3>\n<p>P\u0159\u00edpojnice v rozvad\u011b\u010d\u00edch a sp\u00ednac\u00edch za\u0159\u00edzen\u00edch \u010del\u00ed b\u011bhem poruch stejn\u00e9mu tepeln\u00e9mu nam\u00e1h\u00e1n\u00ed jako kabely, ale jejich proces ov\u011b\u0159en\u00ed se m\u00edrn\u011b li\u0161\u00ed kv\u016fli geometrii a podm\u00ednk\u00e1m instalace. M\u011bd\u011bn\u00e9 nebo hlin\u00edkov\u00e9 ty\u010de maj\u00ed vynikaj\u00edc\u00ed tepelnou vodivost, ale jejich kompaktn\u00ed uspo\u0159\u00e1d\u00e1n\u00ed v uzav\u0159en\u00fdch panelech omezuje odvod tepla b\u011bhem kr\u00e1tk\u00e9ho trv\u00e1n\u00ed poruchy.<\/p>\n<p>Plat\u00ed stejn\u00fd princip I\u00b2t, ale in\u017een\u00fd\u0159i mus\u00ed zohlednit faktor st\u0159\u00eddav\u00e9ho povrchov\u00e9ho jevu (Kf) a p\u0159esn\u00e9 rozm\u011bry vodi\u010de. Pro obd\u00e9ln\u00edkov\u00e9 m\u011bd\u011bn\u00e9 p\u0159\u00edpojnice se v\u00fdpo\u010det tepeln\u00e9 odolnosti st\u00e1v\u00e1:<\/p>\n<p><strong>\u03b8k = \u03b80 + (I\u00b2t \u00d7 Kf \u00d7 \u03c10) \/ (A\u00b2 \u00d7 c \u00d7 \u03b3 \u00d7 (1 + \u03b10 \u00d7 \u03b80))<\/strong><\/p>\n<p>Kde:<\/p>\n<ul>\n<li>\u03b8k = Kone\u010dn\u00e1 teplota (\u00b0C)<\/li>\n<li>\u03b80 = Po\u010d\u00e1te\u010dn\u00ed teplota (typicky 70 \u00b0C pro trval\u00fd provoz)<\/li>\n<li>I\u00b2t = Propou\u0161t\u011bn\u00e1 energie (A\u00b2s)<\/li>\n<li>Kf = Koeficient dodate\u010dn\u00fdch ztr\u00e1t st\u0159\u00eddav\u00e9ho proudu (typicky 1.0-1.5 v z\u00e1vislosti na frekvenci a rozm\u011brech ty\u010de)<\/li>\n<li>\u03c10 = Rezistivita p\u0159i 0 \u00b0C (1.65\u00d710\u207b\u2078 \u03a9\u00b7m pro m\u011b\u010f)<\/li>\n<li>A = Plocha pr\u016f\u0159ezu (m\u00b2)<\/li>\n<li>c = M\u011brn\u00e1 tepeln\u00e1 kapacita (395 J\/(kg\u00b7K) pro m\u011b\u010f)<\/li>\n<li>\u03b3 = Hustota (8900 kg\/m\u00b3 pro m\u011b\u010f)<\/li>\n<li>\u03b10 = Teplotn\u00ed koeficient (1\/235 K\u207b\u00b9 pro m\u011b\u010f)<\/li>\n<\/ul>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/VIOX-electrical-distribution-panel-showing-copper-busbars-requiring-thermal-stress-verification.webp\" alt=\"VIOX electrical distribution panel showing copper busbars requiring thermal stress verification\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 4: Elektrick\u00fd rozvad\u011b\u010d VIOX zobrazuj\u00edc\u00ed m\u011bd\u011bn\u00e9 p\u0159\u00edpojnice, kter\u00e9 vy\u017eaduj\u00ed ov\u011b\u0159en\u00ed tepeln\u00e9ho nam\u00e1h\u00e1n\u00ed.<\/figcaption><\/figure>\n<h3>Vypracovan\u00fd p\u0159\u00edklad: Zv\u00fd\u0161en\u00ed teploty p\u0159\u00edpojnice<\/h3>\n<p><strong>Zad\u00e1n\u00ed<\/strong>: M\u011bd\u011bn\u00e1 p\u0159\u00edpojnice 100\u00d710 mm, po\u010d\u00e1te\u010dn\u00ed teplota 70 \u00b0C, chr\u00e1n\u011bn\u00e1 proudov\u011b omezuj\u00edc\u00edm jisti\u010dem 160 A, p\u0159edpokl\u00e1dan\u00e1 porucha 100 kA.<\/p>\n<p><strong>Krok 1<\/strong>: Z\u00edskejte I\u00b2t jisti\u010de<\/p>\n<ul>\n<li>Z k\u0159ivky v\u00fdrobce: I\u00b2t = 0.48\u00d710\u2076 A\u00b2s<\/li>\n<\/ul>\n<p><strong>Krok 2<\/strong>: Vypo\u010d\u00edtejte kone\u010dnou teplotu<\/p>\n<ul>\n<li>A = 100 mm \u00d7 10 mm = 1000 mm\u00b2 = 1\u00d710\u207b\u00b3 m\u00b2<\/li>\n<li>Kf = 1.0 (konzervativn\u00ed pro tuto geometrii)<\/li>\n<li>Pou\u017eit\u00edm v\u00fd\u0161e uveden\u00e9ho vzorce:<\/li>\n<\/ul>\n<p>\u03b8k = 70 + (0.48\u00d710\u2076 \u00d7 1.0 \u00d7 1.65\u00d710\u207b\u2078) \/ ((1\u00d710\u207b\u00b3)\u00b2 \u00d7 395 \u00d7 8900 \u00d7 (1 + 1\/235 \u00d7 70))<\/p>\n<p>\u03b8k \u2248 70.8 \u00b0C<\/p>\n<p><strong>V\u00fdsledek<\/strong>: Zv\u00fd\u0161en\u00ed teploty je men\u0161\u00ed ne\u017e 1 \u00b0C, co\u017e demonstruje \u00fa\u010dinnost proudov\u011b omezuj\u00edc\u00ed ochrany. Bez omezen\u00ed proudu by stejn\u00e1 porucha 100 kA trvaj\u00edc\u00ed 500 ms zv\u00fd\u0161ila teplotu p\u0159\u00edpojnice na p\u0159ibli\u017en\u011b 95 \u00b0C \u2013 st\u00e1le v mez\u00edch, ale s v\u00fdrazn\u011b sn\u00ed\u017eenou bezpe\u010dnostn\u00ed rezervou.<\/p>\n<p>Tento dramatick\u00fd rozd\u00edl vysv\u011btluje, pro\u010d proudov\u011b omezuj\u00edc\u00ed jisti\u010de umo\u017e\u0148uj\u00ed pou\u017eit\u00ed men\u0161\u00edch a ekonomi\u010dt\u011bj\u0161\u00edch p\u0159\u00edpojnic v modern\u00edch konstrukc\u00edch sp\u00ednac\u00edch za\u0159\u00edzen\u00ed p\u0159i zachov\u00e1n\u00ed bezpe\u010dnostn\u00edch standard\u016f.<\/p>\n<hr \/>\n<h2>Normy a po\u017eadavky na shodu<\/h2>\n<h3>IEC 60947-2: Z\u00e1kladn\u00ed norma<\/h3>\n<p>IEC 60947-2 upravuje n\u00edzkonap\u011b\u0165ov\u00e9 jisti\u010de a na\u0159izuje, aby v\u00fdrobci poskytovali k\u0159ivky I\u00b2t pro proudov\u011b omezuj\u00edc\u00ed za\u0159\u00edzen\u00ed. Norma specifikuje:<\/p>\n<ul>\n<li><strong>Zku\u0161ebn\u00ed podm\u00ednky<\/strong> pro ur\u010den\u00ed propou\u0161t\u011bn\u00fdch hodnot<\/li>\n<li><strong>Po\u017eadavky na p\u0159esnost k\u0159ivky<\/strong> (typicky tolerance \u00b110%)<\/li>\n<li><strong>Okoln\u00ed teplota<\/strong> p\u0159edpoklady (40 \u00b0C pro pr\u016fmyslov\u00e9 jisti\u010de)<\/li>\n<li><strong>Po\u017eadavky na koordinaci<\/strong> mezi za\u0159\u00edzen\u00edmi na vstupu a v\u00fdstupu<\/li>\n<\/ul>\n<p>Jisti\u010de mus\u00ed prok\u00e1zat konzistentn\u00ed v\u00fdkon I\u00b2t v cel\u00e9m rozsahu vyp\u00ednac\u00ed schopnosti, od minim\u00e1ln\u00edho po jmenovit\u00fd zkratov\u00fd proud.<\/p>\n<h3>Region\u00e1ln\u00ed standardn\u00ed odchylky<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0; text-align: left;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Region<\/th>\n<th>Prim\u00e1rn\u00ed norma<\/th>\n<th>Hlavn\u00ed rozd\u00edly<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Evropa<\/td>\n<td>IEC 60947-2<\/td>\n<td>P\u0159\u00edm\u00e9 k\u0159ivky I\u00b2t po\u017eadovan\u00e9 v datov\u00fdch listech<\/td>\n<\/tr>\n<tr>\n<td>Severn\u00ed Amerika<\/td>\n<td>UL 489<\/td>\n<td>Grafy propou\u0161t\u011bn\u00ed voliteln\u00e9; koordina\u010dn\u00ed tabulky b\u011b\u017en\u011bj\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>\u010c\u00edna<\/td>\n<td>GB 14048.2<\/td>\n<td>Zalo\u017eeno na IEC 60947-2 s drobn\u00fdmi \u00fapravami<\/td>\n<\/tr>\n<tr>\n<td>Austr\u00e1lie<\/td>\n<td>AS\/NZS 60947.2<\/td>\n<td>Identick\u00e9 s IEC s m\u00edstn\u00edmi po\u017eadavky na instalaci<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Integrace kabelov\u00fdch standard\u016f<\/h3>\n<p>Hodnoty tepeln\u00e9 odolnosti vodi\u010d\u016f (K faktory) poch\u00e1zej\u00ed z dopl\u0148kov\u00fdch norem:<\/p>\n<ul>\n<li><strong>IEC 60364-5-54<\/strong>: Po\u017eadavky na instalaci a hodnoty K pro pevn\u00e9 instalace<\/li>\n<li><strong>IEC 60502<\/strong>: Silov\u00e9 kabely s extrudovanou izolac\u00ed<\/li>\n<li><strong>BS 7671<\/strong>: Britsk\u00e9 p\u0159edpisy pro elektroinstalace (harmonizovan\u00e9 s IEC)<\/li>\n<\/ul>\n<p>In\u017een\u00fd\u0159i mus\u00ed zajistit, aby jak ochrann\u00e9 za\u0159\u00edzen\u00ed (podle IEC 60947-2), tak dimenzov\u00e1n\u00ed vodi\u010d\u016f (podle IEC 60364-5-54) byly ov\u011b\u0159eny spole\u010dn\u011b pro zaji\u0161t\u011bn\u00ed \u00fapln\u00e9ho souladu.<\/p>\n<hr \/>\n<h2>Praktick\u00e1 aplikace: Pracovn\u00ed postup n\u00e1vrhu rozvad\u011b\u010de<\/h2>\n<h3>Proces v\u00fdb\u011bru pro nov\u00e9 instalace<\/h3>\n<p>P\u0159i n\u00e1vrhu elektrick\u00e9ho rozvad\u011b\u010de dodr\u017eujte tento systematick\u00fd pracovn\u00ed postup, abyste zajistili spr\u00e1vnou tepelnou ochranu:<\/p>\n<p><strong>F\u00e1ze 1: Anal\u00fdza syst\u00e9mu<\/strong><\/p>\n<ol>\n<li>Vypo\u010d\u00edtejte maxim\u00e1ln\u00ed p\u0159edpokl\u00e1dan\u00fd zkratov\u00fd proud v ka\u017ed\u00e9m distribu\u010dn\u00edm bod\u011b pomoc\u00ed \u00fadaj\u016f o impedanci syst\u00e9mu<\/li>\n<li>Identifikujte v\u0161echny typy, velikosti a izola\u010dn\u00ed materi\u00e1ly vodi\u010d\u016f v instalaci<\/li>\n<li>Ur\u010dete okoln\u00ed teplotn\u00ed podm\u00ednky a p\u0159\u00edpadn\u00e9 reduk\u010dn\u00ed faktory<\/li>\n<\/ol>\n<p><strong>F\u00e1ze 2: V\u00fdb\u011br ochrann\u00e9ho za\u0159\u00edzen\u00ed<\/strong><\/p>\n<ol>\n<li>Vyberte jmenovit\u00e9 hodnoty jisti\u010d\u016f na z\u00e1klad\u011b po\u017eadavk\u016f na proudov\u00e9 zat\u00ed\u017een\u00ed<\/li>\n<li>Ov\u011b\u0159te, zda vyp\u00ednac\u00ed schopnost p\u0159ekra\u010duje p\u0159edpokl\u00e1dan\u00fd poruchov\u00fd proud<\/li>\n<li>Vyberte jisti\u010de omezuj\u00edc\u00ed proud tam, kde jsou vysok\u00e9 \u00farovn\u011b poruchy (&gt;10 kA) nebo jsou vodi\u010de mal\u00e9 (&lt;16 mm\u00b2)<\/li>\n<\/ol>\n<p><strong>F\u00e1ze 3: Tepeln\u00e9 ov\u011b\u0159en\u00ed<\/strong><\/p>\n<ol>\n<li>Z\u00edskejte k\u0159ivky I\u00b2t od v\u00fdrobce jisti\u010d\u016f pro vybran\u00e1 za\u0159\u00edzen\u00ed<\/li>\n<li>Vypo\u010d\u00edtejte tepelnou odolnost vodi\u010de (K\u00b2S\u00b2) pro ka\u017ed\u00fd obvod<\/li>\n<li>Ov\u011b\u0159te, zda I\u00b2t jisti\u010de &lt; K\u00b2S\u00b2 vodi\u010de pro p\u0159edpokl\u00e1dan\u00fd poruchov\u00fd proud<\/li>\n<li>Dokumentujte bezpe\u010dnostn\u00ed rezervy (doporu\u010duje se minim\u00e1ln\u011b 20 %)<\/li>\n<\/ol>\n<p><strong>F\u00e1ze 4: Kontrola koordinace<\/strong><\/p>\n<ol>\n<li>Ov\u011b\u0159te selektivitu mezi ochrann\u00fdmi za\u0159\u00edzen\u00edmi na vstupu a v\u00fdstupu<\/li>\n<li>Zajist\u011bte, aby hodnoty I\u00b2t z\u00e1lo\u017en\u00ed ochrany nep\u0159ekra\u010dovaly limity vodi\u010d\u016f na v\u00fdstupu<\/li>\n<li>Prohl\u00e9dn\u011bte si tabulky koordinace v\u00fdrobce pro kombinace za\u0159\u00edzen\u00ed<\/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\/Circuit-breaker-thermal-protection-verification-flowchart-for-electrical-panel-design.webp\" alt=\"Circuit breaker thermal protection verification flowchart for electrical panel design\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">Obr\u00e1zek 5: V\u00fdvojov\u00fd diagram ov\u011b\u0159en\u00ed tepeln\u00e9 ochrany jisti\u010de pro n\u00e1vrh elektrick\u00e9ho rozvad\u011b\u010de.<\/figcaption><\/figure>\n<h3>Sc\u00e9n\u00e1\u0159e modernizace a vylep\u0161en\u00ed<\/h3>\n<p>St\u00e1vaj\u00edc\u00ed instalace \u010dasto vy\u017eaduj\u00ed vyhodnocen\u00ed, kdy\u017e se zv\u00fd\u0161\u00ed zat\u00ed\u017een\u00ed nebo se zm\u011bn\u00ed \u00farovn\u011b poruchy v d\u016fsledku modernizace s\u00edt\u011b. Proces ov\u011b\u0159en\u00ed I\u00b2t se st\u00e1v\u00e1 kritick\u00fdm:<\/p>\n<p><strong>Sc\u00e9n\u00e1\u0159<\/strong>: Za\u0159\u00edzen\u00ed p\u0159id\u00e1 nov\u00fd transform\u00e1tor, \u010d\u00edm\u017e se zv\u00fd\u0161\u00ed dostupn\u00fd poruchov\u00fd proud z 15 kA na 35 kA na hlavn\u00edm rozvad\u011b\u010di.<\/p>\n<p><strong>Po\u017eadovan\u00e1 anal\u00fdza<\/strong>:<\/p>\n<ol>\n<li>Zkontrolujte st\u00e1vaj\u00edc\u00ed k\u0159ivky I\u00b2t jisti\u010de p\u0159i nov\u00e9 \u00farovni poruchy (35 kA)<\/li>\n<li>Znovu ov\u011b\u0159te tepelnou odolnost v\u0161ech vodi\u010d\u016f na v\u00fdstupu<\/li>\n<li>Zkontrolujte, zda st\u00e1vaj\u00edc\u00ed p\u0159\u00edpojnice z\u016fst\u00e1vaj\u00ed dostate\u010dn\u00e9<\/li>\n<li>Vyhodno\u0165te pot\u0159ebu jisti\u010d\u016f omezuj\u00edc\u00edch proud, pokud standardn\u00ed jisti\u010de nyn\u00ed p\u0159ekra\u010duj\u00ed limity I\u00b2t vodi\u010d\u016f<\/li>\n<\/ol>\n<p>Tato anal\u00fdza \u010dasto odhal\u00ed, \u017ee st\u00e1vaj\u00edc\u00ed standardn\u00ed jisti\u010de, i kdy\u017e maj\u00ed dostate\u010dnou vyp\u00ednac\u00ed schopnost, umo\u017e\u0148uj\u00ed nadm\u011brn\u00e9 I\u00b2t p\u0159i vy\u0161\u0161\u00ed \u00farovni poruchy. Upgrade na jisti\u010de omezuj\u00edc\u00ed proud \u010dasto poskytuje nejekonomi\u010dt\u011bj\u0161\u00ed \u0159e\u0161en\u00ed ve srovn\u00e1n\u00ed s v\u00fdm\u011bnou v\u0161ech poddimenzovan\u00fdch vodi\u010d\u016f.<\/p>\n<hr \/>\n<h2>B\u011b\u017en\u00e9 chyby n\u00e1vrhu a jak se jim vyhnout<\/h2>\n<h3>Chyba 1: P\u0159edpoklad, \u017ee v\u0161echny jisti\u010de omezuj\u00ed proud<\/h3>\n<p><strong>Probl\u00e9m<\/strong>: Ne v\u0161echny jisti\u010de poskytuj\u00ed v\u00fdznamn\u00e9 omezen\u00ed proudu. Standardn\u00ed tepeln\u011b-magnetick\u00e9 jisti\u010de, zejm\u00e9na v\u011bt\u0161\u00ed velikosti r\u00e1mu (&gt;630 A), maj\u00ed \u010dasto minim\u00e1ln\u00ed \u00fa\u010dinek omezen\u00ed proudu. Jejich k\u0159ivky I\u00b2t mohou vykazovat hodnoty jen m\u00edrn\u011b pod neomezenou energi\u00ed poruchy.<\/p>\n<p><strong>\u0158e\u0161en\u00ed<\/strong>: V\u017edy ov\u011b\u0159te typ jisti\u010de a z\u00edskejte skute\u010dn\u00e9 k\u0159ivky I\u00b2t od v\u00fdrobce. Nep\u0159edpokl\u00e1dejte omezen\u00ed proudu pouze na z\u00e1klad\u011b vyp\u00ednac\u00ed schopnosti. V\u00fdkon omezuj\u00edc\u00ed proud je specifick\u00e1 konstruk\u010dn\u00ed vlastnost, nikoli automatick\u00e1 charakteristika vysok\u00e9 vyp\u00ednac\u00ed schopnosti.<\/p>\n<h3>Chyba 2: Pou\u017eit\u00ed \u0161pi\u010dkov\u00e9ho proudu nam\u00edsto RMS<\/h3>\n<p><strong>Probl\u00e9m<\/strong>: In\u017een\u00fd\u0159i n\u011bkdy zam\u011b\u0148uj\u00ed \u0161pi\u010dkov\u00fd propu\u0161t\u011bn\u00fd proud (Ip) zobrazen\u00fd na omezovac\u00edch k\u0159ivk\u00e1ch s hodnotou efektivn\u00edho proudu (RMS) pot\u0159ebnou pro v\u00fdpo\u010dty I\u00b2t. To m\u016f\u017ee v\u00e9st k chyb\u00e1m 40 % i v\u00edce.<\/p>\n<p><strong>\u0158e\u0161en\u00ed<\/strong>: K\u0159ivky I\u00b2t v\u017edy pou\u017e\u00edvaj\u00ed efektivn\u00ed symetrick\u00fd p\u0159edpokl\u00e1dan\u00fd proud na ose X. Pokud jste vypo\u010d\u00edtali \u0161pi\u010dkov\u00fd asymetrick\u00fd proud, vyd\u011blte jej \u221a2 \u00d7 \u03ba (kde \u03ba je \u0161pi\u010dkov\u00fd faktor, obvykle 1,8\u20132,0), abyste z\u00edskali efektivn\u00ed hodnotu pro ode\u010det z k\u0159ivky.<\/p>\n<h3>Chyba 3: Ignorov\u00e1n\u00ed paraleln\u00edch vodi\u010d\u016f<\/h3>\n<p><strong>Probl\u00e9m<\/strong>: Kdy\u017e je v\u00edce vodi\u010d\u016f zapojeno paraleln\u011b na f\u00e1zi (b\u011b\u017en\u00e9 u velk\u00fdch instalac\u00ed), n\u011bkte\u0159\u00ed in\u017een\u00fd\u0159i nespr\u00e1vn\u011b vyn\u00e1sob\u00ed hodnotu K\u00b2S\u00b2 po\u010dtem vodi\u010d\u016f. To je \u0161patn\u011b, proto\u017ee poruchov\u00fd proud se d\u011bl\u00ed mezi paraleln\u00ed cesty, ale energie I\u00b2t ovliv\u0148uje ka\u017ed\u00fd vodi\u010d jednotliv\u011b.<\/p>\n<p><strong>\u0158e\u0161en\u00ed<\/strong>: U paraleln\u00edch vodi\u010d\u016f ov\u011b\u0159te, zda je I\u00b2t jisti\u010de men\u0161\u00ed ne\u017e K\u00b2S\u00b2 pro jeden vodi\u010d. Rozd\u011blen\u00ed poruchov\u00e9ho proudu je ji\u017e zohledn\u011bno ve v\u00fdpo\u010dtu impedance syst\u00e9mu, kter\u00fd ur\u010dil p\u0159edpokl\u00e1dan\u00fd proud.<\/p>\n<h3>Chyba 4: Zanedb\u00e1n\u00ed vliv\u016f okoln\u00ed teploty<\/h3>\n<p><strong>Probl\u00e9m<\/strong>: Hodnoty K ve standardn\u00edch tabulk\u00e1ch p\u0159edpokl\u00e1daj\u00ed specifick\u00e9 po\u010d\u00e1te\u010dn\u00ed teploty (obvykle 70 \u00b0C pro nep\u0159etr\u017eit\u00fd provoz). Instalace v hork\u00e9m prost\u0159ed\u00ed (okoln\u00ed teplota &gt;40 \u00b0C) nebo s vysok\u00fdmi faktory zat\u00ed\u017een\u00ed mohou m\u00edt vy\u0161\u0161\u00ed po\u010d\u00e1te\u010dn\u00ed teploty vodi\u010d\u016f, co\u017e sni\u017euje tepelnou odolnost.<\/p>\n<p><strong>\u0158e\u0161en\u00ed<\/strong>: Pro zv\u00fd\u0161en\u00e9 okoln\u00ed teploty nebo vysok\u00e9 faktory zat\u00ed\u017een\u00ed bu\u010f:<\/p>\n<ul>\n<li>Pou\u017eijte upraven\u00e9 hodnoty K z IEC 60364-5-54 P\u0159\u00edloha A<\/li>\n<li>Pou\u017eijte teplotn\u00ed reduk\u010dn\u00ed faktor na v\u00fdsledek K\u00b2S\u00b2<\/li>\n<li>Zajist\u011bte, aby I\u00b2t jisti\u010de poskytovalo dodate\u010dnou bezpe\u010dnostn\u00ed rezervu (&gt;30 %)<\/li>\n<\/ul>\n<hr \/>\n<h2>Pokro\u010dil\u00e1 t\u00e9mata: Omezen\u00ed energie a obloukov\u00fd v\u00fdboj<\/h2>\n<h3>Role I\u00b2t p\u0159i sni\u017eov\u00e1n\u00ed nebezpe\u010d\u00ed obloukov\u00e9ho v\u00fdboje<\/h3>\n<p>V\u00fdpo\u010dty energie dopadaj\u00edc\u00edho obloukov\u00e9ho v\u00fdboje podle IEEE 1584 tradi\u010dn\u011b pou\u017e\u00edvaj\u00ed \u010dasov\u011b-proudovou k\u0159ivku jisti\u010de k ur\u010den\u00ed doby vypnut\u00ed. Nicm\u00e9n\u011b u jisti\u010d\u016f omezuj\u00edc\u00edch proud, kter\u00e9 pracuj\u00ed ve sv\u00e9 okam\u017eit\u00e9 oblasti, tato metoda v\u00fdrazn\u011b nadhodnocuje skute\u010dnou energii dopadu.<\/p>\n<p>V\u00fdzkum uk\u00e1zal, \u017ee pou\u017eit\u00ed hodnoty I\u00b2t k v\u00fdpo\u010dtu energie obloukov\u00e9ho v\u00fdboje poskytuje p\u0159esn\u011bj\u0161\u00ed v\u00fdsledky pro za\u0159\u00edzen\u00ed omezuj\u00edc\u00ed proud. Vztah je:<\/p>\n<p><strong>Energie dopadu (cal\/cm\u00b2) \u221d \u221a(I\u00b2t) \/ D\u00b2<\/strong><\/p>\n<p>Kde D je pracovn\u00ed vzd\u00e1lenost. Tento p\u0159\u00edstup m\u016f\u017ee sn\u00ed\u017eit vypo\u010dtenou energii dopadu o 50\u201370 % ve srovn\u00e1n\u00ed s metodami \u010dasov\u011b-proudov\u00e9 k\u0159ivky, co\u017e potenci\u00e1ln\u011b sni\u017euje po\u017eadovan\u00e9 kategorie OOPP a zlep\u0161uje bezpe\u010dnost pracovn\u00edk\u016f.<\/p>\n<h3>\u00davahy o koordinaci a selektivit\u011b<\/h3>\n<p>Spr\u00e1vn\u00e1 selektivita vy\u017eaduje, aby fungoval pouze jisti\u010d nejbl\u00ed\u017ee poru\u0161e a aby za\u0159\u00edzen\u00ed na vstupu z\u016fstala zav\u0159en\u00e1. Z pohledu I\u00b2t to znamen\u00e1:<\/p>\n<ol>\n<li><strong>Energetick\u00e1 diskriminace<\/strong>: I\u00b2t jisti\u010de na stran\u011b nap\u00e1jen\u00ed v m\u00edst\u011b poruchy mus\u00ed p\u0159ekro\u010dit celkovou energii vypnut\u00ed jisti\u010de na stran\u011b z\u00e1t\u011b\u017ee<\/li>\n<li><strong>\u010casov\u00e1 diskriminace<\/strong>: Za\u0159\u00edzen\u00ed na stran\u011b nap\u00e1jen\u00ed mus\u00ed z\u016fstat sepnut\u00e9 dostate\u010dn\u011b dlouho, aby za\u0159\u00edzen\u00ed na stran\u011b z\u00e1t\u011b\u017ee odstranilo poruchu<\/li>\n<li><strong>Proudov\u00e1 diskriminace<\/strong>: V n\u011bkter\u00fdch p\u0159\u00edpadech za\u0159\u00edzen\u00ed na stran\u011b nap\u00e1jen\u00ed vid\u00ed pouze sn\u00ed\u017een\u00fd proud v d\u016fsledku impedance za\u0159\u00edzen\u00ed na stran\u011b z\u00e1t\u011b\u017ee<\/li>\n<\/ol>\n<p>V\u00fdrobci poskytuj\u00ed koordina\u010dn\u00ed tabulky, kter\u00e9 ukazuj\u00ed, kter\u00e9 kombinace za\u0159\u00edzen\u00ed dosahuj\u00ed selektivity, ale pochopen\u00ed z\u00e1kladn\u00edch vztah\u016f I\u00b2t pom\u00e1h\u00e1 in\u017een\u00fdr\u016fm \u010dinit informovan\u00e1 rozhodnut\u00ed, kdy\u017e tabulky nepokr\u00fdvaj\u00ed specifick\u00e9 sc\u00e9n\u00e1\u0159e.<\/p>\n<hr \/>\n<h2>Kl\u00ed\u010dov\u00e9 poznatky<\/h2>\n<ul>\n<li><strong>K\u0159ivky I\u00b2t kvantifikuj\u00ed tepelnou energii<\/strong> , kterou jisti\u010de propou\u0161t\u011bj\u00ed b\u011bhem p\u0159eru\u0161en\u00ed poruchy, m\u011b\u0159eno v amp\u00e9r-druh\u00fdch na druhou (A\u00b2s)<\/li>\n<li><strong>Jisti\u010de omezuj\u00edc\u00ed proud<\/strong> mohou sn\u00ed\u017eit energii poruchy 1000\u00d7 nebo v\u00edce ve srovn\u00e1n\u00ed se za\u0159\u00edzen\u00edmi neomezuj\u00edc\u00edmi proud, co\u017e umo\u017e\u0148uje men\u0161\u00ed pr\u016f\u0159ezy vodi\u010d\u016f<\/li>\n<li><strong>\u010cten\u00ed k\u0159ivek I\u00b2t vy\u017eaduje p\u011bt krok\u016f<\/strong>: vypo\u010d\u00edtat potenci\u00e1ln\u00ed proud, um\u00edstit na osu X, sledovat ke k\u0159ivce jisti\u010de, ode\u010d\u00edst hodnotu osy Y, porovnat s odolnost\u00ed vodi\u010de<\/li>\n<li><strong>Tepeln\u00e1 odolnost vodi\u010de<\/strong> se vypo\u010d\u00edt\u00e1 pomoc\u00ed K\u00b2S\u00b2, kde K z\u00e1vis\u00ed na materi\u00e1lu a typu izolace a S je pr\u016f\u0159ezov\u00e1 plocha<\/li>\n<li><strong>Ov\u011b\u0159ovac\u00ed vzorec je jednoduch\u00fd<\/strong>: I\u00b2t jisti\u010de mus\u00ed b\u00fdt men\u0161\u00ed ne\u017e K\u00b2S\u00b2 vodi\u010de p\u0159i potenci\u00e1ln\u00ed \u00farovni poruchov\u00e9ho proudu<\/li>\n<li><strong>Dodr\u017eov\u00e1n\u00ed norem<\/strong> vy\u017eaduje dodr\u017eov\u00e1n\u00ed IEC 60947-2 pro jisti\u010de a IEC 60364-5-54 pro dimenzov\u00e1n\u00ed vodi\u010d\u016f<\/li>\n<li><strong>B\u011b\u017en\u00e9 chyby<\/strong> zahrnuj\u00ed matouc\u00ed hodnoty RMS\/\u0161pi\u010dkov\u00e9 hodnoty, p\u0159edpokl\u00e1daj\u00ed, \u017ee v\u0161echny jisti\u010de omezuj\u00ed proud, a zanedb\u00e1vaj\u00ed vlivy okoln\u00ed teploty<\/li>\n<li><strong>Ov\u011b\u0159en\u00ed p\u0159\u00edpojnic<\/strong> pou\u017e\u00edv\u00e1 stejn\u00fd princip I\u00b2t, ale vy\u017eaduje dal\u0161\u00ed v\u00fdpo\u010dty pro n\u00e1r\u016fst teploty<\/li>\n<li><strong>V\u00fdpo\u010dty obloukov\u00e9ho v\u00fdboje<\/strong> t\u011b\u017e\u00ed z dat I\u00b2t, \u010dasto sni\u017euj\u00ed odhady energie dopadu pro jisti\u010de omezuj\u00edc\u00ed proud<\/li>\n<li><strong>Koordinace a selektivita<\/strong> z\u00e1vis\u00ed na spr\u00e1vn\u00fdch vztaz\u00edch I\u00b2t mezi ochrann\u00fdmi za\u0159\u00edzen\u00edmi na stran\u011b nap\u00e1jen\u00ed a na stran\u011b z\u00e1t\u011b\u017ee<\/li>\n<\/ul>\n<hr \/>\n<h2>\u010casto Kladen\u00e9 Ot\u00e1zky<\/h2>\n<p><strong>Ot\u00e1zka: Mohu pou\u017e\u00edt k\u0159ivky I\u00b2t pro DC jisti\u010de?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Ano, ale s opatrnost\u00ed. DC jisti\u010de maj\u00ed k\u0159ivky I\u00b2t, ale efekt omezen\u00ed proudu je obecn\u011b m\u00e9n\u011b v\u00fdrazn\u00fd ne\u017e u AC jisti\u010d\u016f kv\u016fli absenci p\u0159irozen\u00fdch nulov\u00fdch bod\u016f proudu. V\u017edy pou\u017e\u00edvejte k\u0159ivky specifick\u00e9 pro DC a nikdy nepou\u017e\u00edvejte data AC jisti\u010d\u016f pro DC aplikace. <a href=\"https:\/\/test.viox.com\/cs\/dc-circuit-breaker-sizing-nec-690-vs-iec-60947-2-guide\/\">Zjist\u011bte v\u00edce o dimenzov\u00e1n\u00ed DC jisti\u010d\u016f<\/a>.<\/p>\n<p><strong>Ot\u00e1zka: Co kdy\u017e m\u016fj potenci\u00e1ln\u00ed poruchov\u00fd proud klesne pod po\u010d\u00e1te\u010dn\u00ed bod k\u0159ivky?<\/strong><\/p>\n<p>Odpov\u011b\u010f: V\u011bt\u0161ina k\u0159ivek I\u00b2t za\u010d\u00edn\u00e1 p\u0159i proudech, kde za\u010d\u00edn\u00e1 akce omezen\u00ed proudu (typicky 3-5\u00d7 jmenovit\u00fd proud). Pod touto hranic\u00ed jisti\u010d pracuje ve sv\u00e9 tepeln\u00e9 nebo magnetick\u00e9 oblasti bez v\u00fdznamn\u00e9ho omezen\u00ed. Pro tyto ni\u017e\u0161\u00ed proudy pou\u017eijte \u010dasov\u011b-proudovou k\u0159ivku pro v\u00fdpo\u010det I\u00b2t jako: I\u00b2t = I\u00b2 \u00d7 doba vypnut\u00ed.<\/p>\n<p><strong>Ot\u00e1zka: Jak \u010dasto bych m\u011bl znovu ov\u011b\u0159ovat ochranu I\u00b2t ve st\u00e1vaj\u00edc\u00edch instalac\u00edch?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Op\u011btovn\u00e9 ov\u011b\u0159en\u00ed je nutn\u00e9, kdy\u017e: (1) vylep\u0161en\u00ed s\u00edt\u011b zv\u00fd\u0161\u00ed dostupn\u00fd poruchov\u00fd proud, (2) jsou vym\u011bn\u011bny vodi\u010de nebo prodlou\u017eeny obvody, (3) jsou zm\u011bn\u011bna ochrann\u00e1 za\u0159\u00edzen\u00ed nebo (4) jsou p\u0159id\u00e1ny velk\u00e9 z\u00e1t\u011b\u017ee. Jako osv\u011bd\u010den\u00fd postup prov\u00e1d\u011bjte revizi b\u011bhem periodick\u00fdch studi\u00ed elektrick\u00e9ho syst\u00e9mu (typicky ka\u017ed\u00fdch 5 let). <a href=\"https:\/\/test.viox.com\/cs\/understanding-trip-curves\/\">Pochopen\u00ed vyp\u00ednac\u00edch charakteristik<\/a> pom\u00e1h\u00e1 identifikovat, kdy zm\u011bny ovliv\u0148uj\u00ed ochranu.<\/p>\n<p><strong>Ot\u00e1zka: Maj\u00ed miniaturn\u00ed jisti\u010de (MCB) k\u0159ivky I\u00b2t?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Ano, MCB podle IEC 60898-1 maj\u00ed standardizovan\u00e9 maxim\u00e1ln\u00ed hodnoty I\u00b2t na z\u00e1klad\u011b jejich vyp\u00ednac\u00ed schopnosti (6kA, 10kA atd.) a typu charakteristiky (B, C, D). V\u00fdrobci v\u0161ak ne v\u017edy zve\u0159ej\u0148uj\u00ed podrobn\u00e9 k\u0159ivky. Pro p\u0159esn\u00e9 ov\u011b\u0159en\u00ed si vy\u017e\u00e1dejte data I\u00b2t od v\u00fdrobce nebo pou\u017eijte konzervativn\u00ed maxim\u00e1ln\u00ed hodnoty z IEC 60898-1 P\u0159\u00edloha D. <a href=\"https:\/\/test.viox.com\/cs\/mcb-breaking-capacity-6ka-vs-10ka-selection-guide\/\">Porovn\u00e1n\u00ed vyp\u00ednac\u00ed schopnosti MCB<\/a> poskytuje dal\u0161\u00ed kontext.<\/p>\n<p><strong>Ot\u00e1zka: Mohu interpolovat mezi k\u0159ivkami pro r\u016fzn\u00e9 jmenovit\u00e9 hodnoty jisti\u010d\u016f?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Ne, nikdy neinterpolujte mezi r\u016fzn\u00fdmi jmenovit\u00fdmi hodnotami jisti\u010d\u016f na k\u0159ivk\u00e1ch I\u00b2t. Ka\u017ed\u00e1 jmenovit\u00e1 hodnota m\u00e1 jedine\u010dn\u00e9 vnit\u0159n\u00ed charakteristiky, kter\u00e9 ovliv\u0148uj\u00ed omezen\u00ed proudu. Pokud va\u0161e po\u017eadovan\u00e1 jmenovit\u00e1 hodnota nen\u00ed zobrazena, vy\u017e\u00e1dejte si konkr\u00e9tn\u00ed data od v\u00fdrobce nebo pou\u017eijte k\u0159ivku dal\u0161\u00ed vy\u0161\u0161\u00ed jmenovit\u00e9 hodnoty pro konzervativn\u00ed v\u00fdsledky.<\/p>\n<p><strong>Ot\u00e1zka: Jak\u00fd je rozd\u00edl mezi hodnotami I\u00b2t a Icw na MCCB?<\/strong><\/p>\n<p>Odpov\u011b\u010f: Icw (zkratov\u00fd v\u00fddr\u017en\u00fd proud) je proud, kter\u00fd jisti\u010d vydr\u017e\u00ed po stanovenou dobu (typicky 1 sekundu) bez vypnut\u00ed, pou\u017e\u00edv\u00e1 se pro koordinaci. I\u00b2t je tepeln\u00e1 energie, kterou jisti\u010d propust\u00ed, kdy\u017e vypne. Slou\u017e\u00ed r\u016fzn\u00fdm \u00fa\u010del\u016fm: Icw pro selektivitu, I\u00b2t pro ochranu vodi\u010d\u016f. <a href=\"https:\/\/test.viox.com\/cs\/mccb-short-time-delay-icw-rating-explained\/\">Vysv\u011btlen\u00ed zpo\u017ed\u011bn\u00ed zkratu MCCB<\/a> podrobn\u011b popisuje tento rozd\u00edl.<\/p>\n<hr \/>\n<h2>Z\u00e1v\u011br: Integrace I\u00b2t do va\u0161eho n\u00e1vrhov\u00e9ho procesu<\/h2>\n<p>Pochopen\u00ed a spr\u00e1vn\u00e9 pou\u017eit\u00ed k\u0159ivek I\u00b2t jisti\u010d\u016f transformuje tepelnou ochranu z teoretick\u00e9ho probl\u00e9mu na praktick\u00fd n\u00e1vrhov\u00fd n\u00e1stroj. Proces ov\u011b\u0159en\u00ed \u2013 \u010dten\u00ed k\u0159ivek, v\u00fdpo\u010det odolnosti vodi\u010de a potvrzen\u00ed dostate\u010dn\u00fdch rezerv \u2013 zabere jen n\u011bkolik minut na obvod, ale zabr\u00e1n\u00ed n\u00e1kladn\u00fdm poruch\u00e1m a bezpe\u010dnostn\u00edm rizik\u016fm.<\/p>\n<p>Modern\u00ed elektrick\u00e9 instalace \u010del\u00ed rostouc\u00edm \u00farovn\u00edm poruchov\u00e9ho proudu, proto\u017ee se posiluj\u00ed rozvodn\u00e9 s\u00edt\u011b a roz\u0161i\u0159uje se distribuovan\u00e1 v\u00fdroba. Sou\u010dasn\u011b ekonomick\u00e9 tlaky tla\u010d\u00ed dimenzov\u00e1n\u00ed vodi\u010d\u016f sm\u011brem k minim\u00e1ln\u00edm p\u0159ijateln\u00fdm hodnot\u00e1m. Tato konvergence \u010din\u00ed ov\u011b\u0159en\u00ed I\u00b2t nejen doporu\u010den\u00fdm, ale nezbytn\u00fdm pro bezpe\u010dn\u00e9 n\u00e1vrhy v souladu s p\u0159edpisy.<\/p>\n<p>VIOX Electric poskytuje komplexn\u00ed k\u0159ivky I\u00b2t a technickou podporu pro v\u0161echny jisti\u010de omezuj\u00edc\u00ed proud v na\u0161em sortimentu. N\u00e1\u0161 in\u017een\u00fdrsk\u00fd t\u00fdm pom\u00e1h\u00e1 s v\u00fdpo\u010dty tepeln\u00e9ho ov\u011b\u0159en\u00ed a m\u016f\u017ee doporu\u010dit optim\u00e1ln\u00ed v\u00fdb\u011br jisti\u010d\u016f pro n\u00e1ro\u010dn\u00e9 aplikace, kde se \u00farovn\u011b poruchy bl\u00ed\u017e\u00ed tepeln\u00fdm limit\u016fm vodi\u010d\u016f.<\/p>\n<p>Pro slo\u017eit\u00e9 instalace zahrnuj\u00edc\u00ed v\u00edce \u00farovn\u00ed koordinace, <a href=\"https:\/\/test.viox.com\/cs\/busbar-selection-guide-copper-tin-silver-plating-comparison\/\">v\u00fdb\u011bru p\u0159\u00edpojnic<\/a>, nebo specializovan\u00e9 aplikace, jako jsou <a href=\"https:\/\/test.viox.com\/cs\/what-is-a-pv-combiner-box-and-why-your-solar-system-cant-function-without-one\/\">sol\u00e1rn\u00edch slu\u010dovac\u00edch box\u016f<\/a>, se pora\u010fte se zku\u0161en\u00fdmi elektroin\u017een\u00fdry, kte\u0159\u00ed rozum\u00ed jak teoretick\u00fdm princip\u016fm, tak praktick\u00e9 aplikaci ochrann\u00fdch strategi\u00ed zalo\u017een\u00fdch na I\u00b2t.<\/p>\n<p>Investice do spr\u00e1vn\u00e9ho tepeln\u00e9ho ov\u011b\u0159en\u00ed se vypl\u00e1c\u00ed prost\u0159ednictv\u00edm zv\u00fd\u0161en\u00e9 bezpe\u010dnosti, sn\u00ed\u017een\u00ed po\u0161kozen\u00ed za\u0159\u00edzen\u00ed b\u011bhem poruch, ni\u017e\u0161\u00edch n\u00e1klad\u016f na poji\u0161t\u011bn\u00ed a souladu se st\u00e1le p\u0159\u00edsn\u011bj\u0161\u00edmi elektrick\u00fdmi p\u0159edpisy po cel\u00e9m sv\u011bt\u011b. Ud\u011blejte z anal\u00fdzy k\u0159ivek I\u00b2t standardn\u00ed krok ve va\u0161em procesu v\u00fdb\u011bru jisti\u010d\u016f \u2013 va\u0161e vodi\u010de a va\u0161i klienti v\u00e1m pod\u011bkuj\u00ed.<\/p>\n<hr \/>\n<h2>Souvisej\u00edc\u00ed zdroje<\/h2>\n<ul>\n<li class=\"youmind-editor-node-list-item-ui\">\n<p class=\"youmind-editor-node-paragraph-ui\"><a class=\"youmind-editor-mark-link-ui\" href=\"https:\/\/test.viox.com\/cs\/circuit-breaker-ratings-icu-ics-icw-icm\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Jmenovit\u00e9 hodnoty jisti\u010d\u016f: Vysv\u011btlen\u00ed ICU, ICS, ICW, ICM<\/a><\/p>\n<\/li>\n<li class=\"youmind-editor-node-list-item-ui\">\n<p class=\"youmind-editor-node-paragraph-ui\"><a class=\"youmind-editor-mark-link-ui\" href=\"https:\/\/test.viox.com\/cs\/current-limiting-circuit-breaker-guide\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Pr\u016fvodci jisti\u010di s omezen\u00edm proudu<\/a><\/p>\n<\/li>\n<li class=\"youmind-editor-node-list-item-ui\">\n<p class=\"youmind-editor-node-paragraph-ui\"><a class=\"youmind-editor-mark-link-ui\" href=\"https:\/\/test.viox.com\/cs\/how-to-select-an-mccb-for-a-panel\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Jak vybrat MCCB pro panel<\/a><\/p>\n<\/li>\n<li class=\"youmind-editor-node-list-item-ui\">\n<p class=\"youmind-editor-node-paragraph-ui\"><a class=\"youmind-editor-mark-link-ui\" href=\"https:\/\/test.viox.com\/cs\/types-of-circuit-breakers\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">Typy jisti\u010d\u016f<\/a><\/p>\n<\/li>\n<\/ul>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 4231.56px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 4231.56px; left: 14px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Direct Answer The I\u00b2t (permissible energy) curve of a circuit breaker shows the thermal energy that passes through during fault interruption. Reading this curve is straightforward: locate your prospective short-circuit current on the X-axis, trace upward to intersect the breaker&#8217;s curve, then read the corresponding I\u00b2t value on the Y-axis. This value must be less [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21493,"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-21492","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\/21492","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=21492"}],"version-history":[{"count":2,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/21492\/revisions"}],"predecessor-version":[{"id":21495,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/posts\/21492\/revisions\/21495"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media\/21493"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/media?parent=21492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/categories?post=21492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/cs\/wp-json\/wp\/v2\/tags?post=21492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}