{"id":33387,"date":"2019-10-31T21:52:18","date_gmt":"2019-10-31T18:52:18","guid":{"rendered":"https:\/\/prohoster.info\/blog\/sistema-dugovoj-zashhity-s-vozmozhnostyu-srabatyvaniya-po-tokovomu-signalu\/"},"modified":"2019-10-31T21:52:18","modified_gmt":"2019-10-31T18:52:18","slug":"sistema-dugovoj-zashhity-s-vozmozhnostyu-srabatyvaniya-po-tokovomu-signalu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/sistema-dugovoj-zashhity-s-vozmozhnostyu-srabatyvaniya-po-tokovomu-signalu","title":{"rendered":"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu\" src=\"\/wp-content\/uploads\/2019\/05\/07bfb9a07736ce2f9f9d17ef429b1d67.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nU klasi\u010dnom smislu, za\u0161tita od lukova u Rusiji je brzo deluju\u0107a za\u0161tita od kratkih spojeva, zasnovana na registraciji spektra svetlosti otvorenog elektri\u010dnog luka u KRU, naj\u010de\u0161\u0107e kori\u0161\u0107ena metoda registracije spektra svetlosti je putem vlaknastih opti\u010dkih senzora, koja se uglavnom primenjuje u industrijskom sektoru. Me\u0111utim, s pojavom novih proizvoda u oblasti za\u0161tite od lukova u stambenom sektoru, posebno modularnih AFDD sa signalom struje, \u0161to omogu\u0107ava postavljanje za\u0161tite od lukova na odlaznim linijama, uklju\u010duju\u0107i razvodne kutije, kablove, veze, uti\u010dnice itd., interesovanje za ovu temu raste.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu\" src=\"\/wp-content\/uploads\/2019\/05\/f35ab8d139903844857910e809d4c981.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMe\u0111utim, proizvo\u0111a\u010di se ne \u0161ire mnogo o detaljnoj izradi modulskih proizvoda (ako neko ima takve informacije, bio bih samo sre\u0107an za linkove na izvore tih informacija). U drugom slu\u010daju, sistemi za\u0161tite od lukova za industrijski sektor imaju detaljna uputstva korisnika na 122 strane, gde se veoma precizno obja\u0161njava princip rada.<\/p>\n<p>Uzmimo za primer sistem za\u0161tite od lukova VAMP 321 od Schneider Electric, koji uklju\u010duje sve funkcije za\u0161tite od luka, kao \u0161to su preoptere\u0107enje strujom i kontrola prisustva luka.<\/p>\n<p><img decoding=\"async\" alt=\"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu\" src=\"\/wp-content\/uploads\/2019\/05\/1f41efdf7c3b6db7c38b4901a2954927.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Funkcionalnost<\/h3>\n<p><\/p>\n<ul>\n<li>Kontrola struje u tri faze.<\/li>\n<li>Struja nulaste sekvencije.<\/li>\n<li>Dnevnici doga\u0111aja, snimanje vanrednih re\u017eima.<\/li>\n<li>Aktivacija mo\u017ee biti ili istovremena po struji i svetlu, ili samo po svetlu, ili samo po struji.<\/li>\n<li>Vreme aktivacije izlaza sa mehani\u010dkim relejem manje od 7 ms, sa opcionalnom IGBT karticom vreme aktivacije se smanjuje na 1 ms.<\/li>\n<li>Pode\u0161iva zona aktivacije.<\/li>\n<li>Neprekidni sistem samopra\u0107enja.<\/li>\n<li>Ure\u0111aj mo\u017ee biti kori\u0161\u0107en u raznim sistemima za\u0161tite od lukova u distributivnim mre\u017eama niskog i srednjeg napona.<\/li>\n<li>Sistem za otkrivanje bljeskova luka i za\u0161titu od lukova meri struju kratkog spoja i signal kroz kanale senzora luka i u slu\u010daju pojave kratkog spoja minimizira vreme gorenja, brzo isklju\u010duju\u0107i napajanje koje napaja luk.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Princip korelacije matrica<\/h3>\n<p>\nKada se postave uslovi aktivacije konkretne stepene za\u0161tite od lukova, primenjuje se logi\u010dko sabiranje na izlaze matrica svetlosti i struje.<\/p>\n<p>Ako je stupanj za\u0161tite odabran samo u jednom okviru, radi ili na osnovi struje ili na osnovi svjetlosti, na taj na\u010din se sustav mo\u017ee konfigurirati za rad samo na temelju strujnog signala.<\/p>\n<h3>Signali dostupni za kontrolu prilikom programiranja stupnjeva za\u0161tite:<\/h3>\n<p><\/p>\n<ul>\n<li>Struje u fazama.<\/li>\n<li>Struja nulaste sekvencije.<\/li>\n<li>Linearni naponi.<\/li>\n<li>Fazni naponi.<\/li>\n<li>Napon nulte sekvence.<\/li>\n<li>Frekvencija.<\/li>\n<li>Zbroj faznih struja.<\/li>\n<li>Struja izravne sekvence.<\/li>\n<li>Struja obrnute sekvence.<\/li>\n<li>Relativna vrijednost struje obrnute sekvence.<\/li>\n<li>Omjer struja obrnute i nulte sekvence.<\/li>\n<li>Napon izravne sekvence.<\/li>\n<li>Napon obrnute sekvence.<\/li>\n<li>Relativna vrijednost napona obrnute sekvence.<\/li>\n<li>Srednja vrijednost struje u fazama (IL1+IL2+IL3)\/3.<\/li>\n<li>Srednja vrijednost napona UL1, UL2, UL3.<\/li>\n<li>Srednja vrijednost napona U12, U23, U32.<\/li>\n<li>Koeficijent nelinearnih izobli\u010denja IL1.<\/li>\n<li>Koeficijent nelinearnih izobli\u010denja IL2.<\/li>\n<li>Koeficijent nelinearnih izobli\u010denja IL3.<\/li>\n<li>Koeficijent nelinearnih izobli\u010denja Ua.<\/li>\n<li>Srednjekvadratna vrijednost IL1.<\/li>\n<li>Srednjekvadratna vrijednost IL2.<\/li>\n<li>Srednjekvadratna vrijednost IL3.<\/li>\n<li>Min''imalna vrijednost IL1, IL2, IL3.<\/li>\n<li>Maksimalna vrijednost IL1, IL2, IL3.<\/li>\n<li>Minimalna vrijednost U12, U23, U32.<\/li>\n<li>Maksimalna vrijednost U12, U23, U32.<\/li>\n<li>Minimalna vrijednost UL1, UL2, UL3.<\/li>\n<li>Maksimalna vrijednost UL1, UL2, UL3.<\/li>\n<li>Pozadinska vrijednost Uo.<\/li>\n<li>Srednjekvadratna vrijednost I\u043e.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Zapisivanje hitnih re\u017eima<\/h3>\n<p>\nZapisivanje hitnih re\u017eima mo\u017ee se koristiti za pohranu svih signala mjerenja (struje, naponi, informacije o stanjima digitalnih ulaza i izlaza). Digitalni ulazi tako\u0111er uklju\u010duju signale za\u0161tite od lukova.<\/p>\n<h3>Pokretanje snimanja<\/h3>\n<p>\nSnimanje mo\u017ee biti pokrenuto aktivacijom ili pokretanjem bilo kojeg stupnja za\u0161tite ili bilo kojim digitalnim ulazom. Signal pokretanja bira se u matrici izlaznih signala (vertikalni signal DR). Tako\u0111er, snimanje mo\u017ee biti pokrenuto ru\u010dno.<\/p>\n<h3>Samoprovjera<\/h3>\n<p>\nEnergetski neovisna memorija ure\u0111aja ostvarena je kori\u0161tenjem kondenzatora velike otpornosti i operativne memorije s niskom potro\u0161njom energije.<\/p>\n<p>Kada je dodatni izvor napajanja uklju\u010den, kondenzator i radna memorija napajaju se iz unutarnjeg izvora. Kada je izvor napajanja isklju\u010den, radna memorija po\u010dinje primati napajanje iz kondenzatora. Ona \u0107e zadr\u017eati informacije sve dok kondenzator mo\u017ee odr\u017eavati prihvatljiv naponski nivo. Za prostoriju s temperaturom +25\u00b0C, vrijeme rada \u0107e iznositi 7 dana (visoka vla\u017enost smanjuje ovaj parametar).<\/p>\n<p>Energonnezavisna radna memorija slu\u017ei za pohranu zapisa o izvanrednim re\u017eimima i dnevniku doga\u0111aja.<\/p>\n<p>Funkcije mikrocontrollera i cjelovitost povezanih \u017eica, zajedno s ispravno\u0161\u0107u softvera, kontrolira zasebna mre\u017ea samoprovere. Osim kontrole, ova mre\u017ea poku\u0161ava ponovo pokrenuti mikrocontroller u slu\u010daju kvara. Ako ponovo pokretanje ne uspije, ure\u0111aj samoprovere \u0161alje signal za po\u010detak indikacije stalnog unutarnjeg o\u0161te\u0107enja.<\/p>\n<p>U slu\u010daju da ure\u0111aj samoprovere otkrije stalno o\u0161te\u0107enje, blokira druge izlazne releje (osim izlaznog releja funkcije samoprovere i izlaznih releja koji se koriste za za\u0161titu od lukova).<\/p>\n<p>Tako\u0111e se kontrolira unutarnji izvor napajanja. U slu\u010daju nedostatka dodatnog napajanja, automatski se \u0161alje signal za uzbunu. To zna\u010di da je izlazni relej unutarnjeg o\u0161te\u0107enja pod naponom, ako je dodatni izvor napajanja uklju\u010den i nisu otkrivena unutarnja o\u0161te\u0107enja.<\/p>\n<p>Kontrolira se centralna jedinica, ure\u0111aji za ulaz\/izlaz i senzori.<\/p>\n<h3>Mjerenja koja koristi funkcija za\u0161tite od lukova<\/h3>\n<p>\nMjerenja struje u tri faze i struje kratkog spoja na zemlju za za\u0161titu od lukova provodi elektronika. Elektronika uspore\u0111uje nivoe struje s vrijednostima pragova aktiviranja i izbacuje binarne signale 'I&gt;&gt;' ili 'Io&gt;&gt;' za funkciju za\u0161tite od lukova u slu\u010daju prekora\u010denja limita. U obzir se uzimaju sve komponente struja.<\/p>\n<p>Signali 'I&gt;&gt;' i 'Io&gt;&gt;' povezani su s FPGA \u010dipom koji obavlja funkciju za\u0161tite od lukova. Ta\u010dnost mjerenja za za\u0161titu od lukova iznosi \u00b1 15% na 50Hz.<\/p>\n<p><img decoding=\"async\" alt=\"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu\" src=\"\/wp-content\/uploads\/2019\/05\/c1f12088f2d6f4f00acaadac09a254cb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Harmonici i ukupna nesinusoidnost (THD)<\/h3>\n<p>\nUre\u0111aj izra\u010dunava THD kao postotak struja i napona na osnovnoj frekvenciji.<\/p>\n<p>Uzimaju se u obzir harmonici od 2. do 15. za fazne struje i napone. (17. harmonika \u0107e biti djelomi\u010dno uzeta u obzir u vrijednosti 15. harmonike. To se doga\u0111a zbog na\u010dela digitalnog mjerenja.)<\/p>\n<h3>Na\u010dini mjerenja napona<\/h3>\n<p>\nOvisno o vrsti primjene i raspolo\u017eivim transformatorima struje, ure\u0111aj se mo\u017ee spojiti ili na napon nulte sekvence, linearni ili fazni napon. Postavljeni parametar \"Na\u010din mjerenja napona\" treba biti postavljen u skladu s kori\u0161tenom vezom.<\/p>\n<h3>Dostupni na\u010dini:<\/h3>\n<p><\/p>\n<h3>\"U0\"<\/h3>\n<p>\nUre\u0111aj je spojen na napon nulte sekvence. Dostupna je usmjerena za\u0161tita od kratkog spoja na zemlju. Mjerenje linearnih napona, mjerenje energije i za\u0161tite od pove\u0107anja i smanjenja napona nisu dostupni.<\/p>\n<p><img decoding=\"async\" alt=\"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu\" src=\"\/wp-content\/uploads\/2019\/05\/d28c23a5da99f011260962f9d5f22124.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>\"1LL\"<\/h3>\n<p>\nUre\u0111aj je spojen na linearni napon. Dostupno je mjerenje napona u jednoj fazi i za\u0161tite od smanjenja i pove\u0107anja napona. Usmjerena za\u0161tita od kratkog spoja na zemlju nije dostupna.<\/p>\n<p><img decoding=\"async\" alt=\"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu\" src=\"\/wp-content\/uploads\/2019\/05\/ef85c9390c7ffe9b21367cceca125f0c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>\"1LN\"<\/h3>\n<p>\nUre\u0111aj je spojen na jedan fazni napon. Dostupno je mjerenje napona u jednoj fazi. U mre\u017eama s nulteom utemeljenjem i kompenziranom neutralom dostupne su za\u0161tite od smanjenja i pove\u0107anja napona. Usmjerena za\u0161tita od kratkog spoja na zemlju nije dostupna.<\/p>\n<p><img decoding=\"async\" alt=\"Sustav za\u0161tite od prenapona s mogu\u0107no\u0161\u0107u aktivacije prema strujnom signalu\" src=\"\/wp-content\/uploads\/2019\/05\/5cb78a2fa82bd50a825f13fad995e134.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Simetri\u010dne komponente<\/h3>\n<p>\nU trofaznom sustavu, naponi i struje mogu se razlo\u017eiti na simetri\u010dne komponente, prema Fortescueu.<\/p>\n<h3>Simetri\u010dne komponente su:<\/h3>\n<p><\/p>\n<ul>\n<li>Direktna sekvenca.<\/li>\n<li>Obrnuta sekvenca.<\/li>\n<li>Nulta sekvenca.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Kontrolirani objekti<\/h3>\n<p>\nOvaj ure\u0111aj omogu\u0107uje kontrolu do \u0161est objekata, poput prekida\u010da, razdjeljnika ili uzemljiva\u010da. Kontrola se mo\u017ee provoditi prema principu \"izbor-djelovanje\" ili \"izravna kontrola\".<\/p>\n<h3>Logi\u010dke funkcije<\/h3>\n<p>\nUre\u0111aj podr\u017eava korisni\u010dku programski logiku za logi\u010dke izraze signala.<\/p>\n<h3>Dostupne funkcije su:<\/h3>\n<p><\/p>\n<ul>\n<li>I.<\/li>\n<li>ILI.<\/li>\n<li>Isklju\u010divo ILI.<\/li>\n<li>NE.<\/li>\n<li>COUNTER-i.<\/li>\n<li>RS &amp; D flip-flopovi.<\/li>\n<\/ul>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/451212\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u043f\u043e\u043d\u0438\u043c\u0430\u043d\u0438\u0438 \u0434\u0443\u0433\u043e\u0432\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u0432 \u0420\u043e\u0441\u0441\u0438\u0438 \u2013 \u044d\u0442\u043e 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\u043f\u043e\u0441\u0440\u0435\u0434\u0441\u0442\u0432\u043e\u043c \u0432\u043e\u043b\u043e\u043a\u043e\u043d\u043d\u043e-\u043e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0434\u0430\u0442\u0447\u0438\u043a\u043e\u0432, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0432 \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u043c \u0441\u0435\u043a\u0442\u043e\u0440\u0435, \u043d\u043e \u0441 \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u0435\u043c \u043d\u043e\u0432\u044b\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u0434\u0443\u0433\u043e\u0432\u043e\u0439 \u0437\u0430\u0449\u0438\u0442\u044b \u0432 \u0436\u0438\u043b\u043e\u043c \u0441\u0435\u043a\u0442\u043e\u0440\u0435, \u0430 \u0438\u043c\u0435\u043d\u043d\u043e \u043c\u043e\u0434\u0443\u043b\u044c\u043d\u044b\u0445 AFDD, 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