{"id":24248,"date":"2023-10-18T23:37:01","date_gmt":"2023-10-18T22:37:01","guid":{"rendered":"http:\/\/indolighting.com\/?p=24248"},"modified":"2026-09-29T20:15:22","modified_gmt":"2026-09-29T19:15:22","slug":"ivadas-i-apsauga-nuo-virsitampiu","status":"publish","type":"post","link":"https:\/\/indolighting.com\/lt\/ivadas-i-apsauga-nuo-virsitampiu\/","title":{"rendered":"\u012evadas \u012f apsaug\u0105 nuo vir\u0161\u012ftampi\u0173"},"content":{"rendered":"<h5><span style=\"color: #00a5db;\">Jei ketinate modernizuoti ap\u0161vietim\u0105 arba norite, kad pirkimo sprendimai b\u016bt\u0173 gerai pagr\u012fsti, \u0161tai naudingas \u012fvadas apie varistorius (MOV) ir platesnes apsaugos nuo vir\u0161\u012ftampi\u0173 sistemas, reikalingas \u0161viestuvams apsaugoti<\/span><\/h5>\n<h5><span style=\"color: #f29621;\">Kas gi yra MOV?<\/span><\/h5>\n<figure id=\"attachment_2908\" aria-describedby=\"caption-attachment-2908\" style=\"width: 334px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/metal-oxide-varistors.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2908\" src=\"https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/metal-oxide-varistors.jpg\" alt=\"Varistori\u0173 iTMOV ir TMOV nuotrauka\" width=\"334\" height=\"334\" srcset=\"https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/metal-oxide-varistors.jpg 334w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/metal-oxide-varistors-100x100.jpg 100w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/metal-oxide-varistors-300x300.jpg 300w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/metal-oxide-varistors-150x150.jpg 150w\" sizes=\"auto, (max-width: 334px) 100vw, 334px\" \/><\/a><figcaption id=\"caption-attachment-2908\" class=\"wp-caption-text\"><em>Varistori\u0173 iTMOV ir TMOV nuotrauka, suteikta Littelfuse<\/em><\/figcaption><\/figure>\n<p>Metalo oksido varistoriai (MOV) veiksmingai riboja impulsinius vir\u0161\u012ftampius ir vir\u0161\u012ftampius kaip pirmin\u0117 ap\u0161vietimo \u012frangos apsaugos pakopa. Paprastai tariant, vir\u0161\u012ftampio metu MOV praleid\u017eia srov\u0119 ir sugeria didel\u012f gedimo energijos kiek\u012f, taip apsaugodamas prie jo prijungt\u0105 \u012frang\u0105.<\/p>\n<p>\u012eprastai veikiant MOV yra pasyvusis komponentas, jungiamas tarp faz\u0117s ir neutral\u0117s diferencinio re\u017eimo vir\u0161\u012ftampiams ir tarp faz\u0117s ir (arba) neutral\u0117s ir \u012f\u017eeminimo bendrojo re\u017eimo vir\u0161\u012ftampiams.<\/p>\n<p>Esant tam tikrai vardinei darbo \u012ftampai, MOV fizinis dydis rodo jo vardines charakteristikas (t. y. did\u017eiausi\u0105 i\u0161krovos srov\u0119); didesni MOV paprastai atlaiko daugiau tam tikros \u012ftampos impuls\u0173, kol susid\u0117vi.  Kita svarbi kiekvieno MOV charakteristika yra jo voltamperin\u0117 (V-I) kreiv\u0117, t. y. srov\u0117, kuri\u0105 jis praleid\u017eia esant \u012fvairiems vir\u0161\u012ftampiams, kad apsaugot\u0173 prijungt\u0105 \u012frang\u0105. Be kita ko, \u0161i kreiv\u0117 parodo, kada MOV prad\u0117s praleisti didel\u0119 srov\u0119.<\/p>\n<h5><span style=\"color: #f29621;\">Kod\u0117l svarbi antrin\u0117 apsauga<\/span><\/h5>\n<p>Svarbu atkreipti d\u0117mes\u012f, kad vir\u0161\u012ftampio metu MOV \u201eapriboja\u201c vir\u0161\u012ftamp\u012f. \u0160i apribota \u012ftampa patenka \u012f ap\u0161vietimo \u012frang\u0105. Tod\u0117l \u012frangos antrin\u0117 apsauga (arba pati \u012franga) turi atlaikyti \u0161i\u0105 apribot\u0105 \u012ftamp\u0105 (kuri gali siekti apie 1 000 V). D\u0117l netinkamai suprojektuotos antrin\u0117s apsaugos ap\u0161vietimo \u012franga gali sugesti dar prie\u0161 pasibaigiant MOV eksploatavimo laikui.<\/p>\n<h5><span style=\"color: #f29621;\">Kas yra subalansuota MOV sistema<\/span><\/h5>\n<p>Apsaugos sistemos i\u0161 keli\u0173 MOV (arba apsaugos nuo vir\u0161\u012ftampi\u0173 \u012ftais\u0173) turi b\u016bti kruop\u0161\u010diai apgalvotos, kad b\u016bt\u0173 veiksmingos. Prie\u0161ingu atveju sistema apsaugos tik tiek, kiek silpniausias MOV.  Taip yra tod\u0117l, kad skirting\u0173 MOV voltamperin\u0117s kreiv\u0117s neabejotinai skirsis d\u0117l komponent\u0173 ver\u010di\u0173, gamintoj\u0173 ar net gamybos partij\u0173 skirtum\u0173.<\/p>\n<figure id=\"attachment_2904\" aria-describedby=\"caption-attachment-2904\" style=\"width: 719px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2904\" src=\"https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/V-I-MOV.png\" alt=\"Voltamperin\u0117 (V-I) kreiv\u0117\" width=\"719\" height=\"397\" srcset=\"https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/V-I-MOV.png 1580w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/V-I-MOV-600x331.png 600w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/V-I-MOV-300x165.png 300w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/V-I-MOV-1024x564.png 1024w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/V-I-MOV-768x423.png 768w, https:\/\/indolighting.com\/wp-content\/uploads\/2016\/05\/V-I-MOV-1536x847.png 1536w\" sizes=\"auto, (max-width: 719px) 100vw, 719px\" \/><figcaption id=\"caption-attachment-2904\" class=\"wp-caption-text\"><em>Voltamperin\u0117 (V-I) kreiv\u0117 rodo laidum\u0105 esant skirtingoms vir\u0161\u012ftampio vert\u0117ms<\/em><\/figcaption><\/figure>\n<p>Gali atrodyti, kad \u0161viestuvuose su vienu apsaugos nuo vir\u0161\u012ftampi\u0173 \u012ftaisu (SPD) n\u0117ra jokios sistemos, d\u0117l kurios reik\u0117t\u0173 nerimauti.  Ta\u010diau daugelyje prijungt\u0173 \u012ftais\u0173, pavyzd\u017eiui, fotorel\u0117je ir LED maitinimo \u0161altinyje, tarp faz\u0117s ir neutral\u0117s yra MOV.  Jei sistema suprojektuota tinkamai, jos komponentus galima gana gerai suderinti, tod\u0117l vir\u0161\u012ftampis pasiskirsto tarp fotorel\u0117s, SPD ir maitinimo \u0161altinio. Ta\u010diau jei sistema <span style=\"text-decoration: underline;\">nesuderinta<\/span> , vis\u0105 vir\u0161\u012ftamp\u012f gali prisiimti ma\u017eiausias MOV (pvz., fotorel\u0117je), o tai gali lemti \u017eibinto \u0161vietim\u0105 dien\u0105 arba gedim\u0105.<\/p>\n<p>Tai labai svarbu, kai norite modernizuoti sistem\u0105 ar pakeisti atskir\u0105 komponent\u0105, pavyzd\u017eiui, sugedus\u012f LED maitinimo \u0161altin\u012f.  Tokiu atveju \u0161viestuve gali b\u016bti 5 kA MOV maitinimo \u0161altinyje ir ma\u017eesnis 2 kA MOV fotorel\u0117je, kurie i\u0161 prad\u017ei\u0173 buvo parinkti taip, kad vir\u0161\u012ftampis pasiskirstyt\u0173 subalansuotai.  Jei suged\u0119s LED maitinimo \u0161altinis pakei\u010diamas modeliu su 10 kA MOV, kurio voltamperin\u0117 kreiv\u0117 kitokia, galiausiai gali nutikti taip, kad \u012f 2 kA fotorel\u0117s MOV bus nukreipta <span style=\"text-decoration: underline;\">daugiau<\/span> vir\u0161\u012ftampio nei prie\u0161 modernizavim\u0105!  Tokiu atveju po pakeitimo sistema apsaugota gerokai pras\u010diau nei anks\u010diau.<\/p>\n<h5><span style=\"color: #f29621;\">K\u0105 visa tai rei\u0161kia<\/span><\/h5>\n<p>Galiausiai, \u010dia daug sud\u0117ting\u0173 aspekt\u0173.  Norint u\u017etikrinti patikim\u0105 veikim\u0105 ir \u0161viestuvo apsaug\u0105, b\u016btina tur\u0117ti tinkamas antrines apsaugos priemones ir per vis\u0105 \u0161viestuvo eksploatavimo laik\u0105 vertinti vis\u0105 sistem\u0105.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jei ketinate modernizuoti ap\u0161vietim\u0105 arba norite, kad pirkimo sprendimai b\u016bt\u0173 gerai pagr\u012fsti, \u0161tai naudingas \u012fvadas apie varistorius (MOV) ir platesnes apsaugos nuo vir\u0161\u012ftampi\u0173 sistemas, reikalingas \u0161viestuvams apsaugoti Kas gi yra MOV? Metalo oksido varistoriai (MOV) veiksmingai riboja impulsinius vir\u0161\u012ftampius ir vir\u0161\u012ftampius kaip pirmin\u0117 ap\u0161vietimo \u012frangos apsaugos pakopa. Paprastai tariant, vir\u0161\u012ftampio metu MOV praleid\u017eia srov\u0119 ir [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":19484,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129],"tags":[],"class_list":["post-24248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/posts\/24248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/comments?post=24248"}],"version-history":[{"count":1,"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/posts\/24248\/revisions"}],"predecessor-version":[{"id":24249,"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/posts\/24248\/revisions\/24249"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/media\/19484"}],"wp:attachment":[{"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/media?parent=24248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/categories?post=24248"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/indolighting.com\/lt\/wp-json\/wp\/v2\/tags?post=24248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}