{"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\/ro\/blog\/news\/sistema-dugovoj-zashhity-s-vozmozhnostyu-srabatyvaniya-po-tokovomu-signalu","title":{"rendered":"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent\" src=\"\/wp-content\/uploads\/2019\/05\/07bfb9a07736ce2f9f9d17ef429b1d67.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen \u00een\u021belegerea clasic\u0103, protec\u021bia arcului \u00een Rusia este o protec\u021bie rapid\u0103 \u00eempotriva scurtcircuitelor, bazat\u0103 pe \u00eenregistrarea spectrului de lumin\u0103 al arcului electric deschis \u00een KRU. Cea mai utilizat\u0103 metod\u0103 de \u00eenregistrare a spectrului de lumin\u0103 este prin senzori cu fibr\u0103 optic\u0103, fiind aplicat\u0103 \u00een principal \u00een sectorul industrial. Totu\u0219i, odat\u0103 cu apari\u021bia de noi produse \u00een domeniul protec\u021biei \u00eempotriva arcului \u00een sectorul reziden\u021bial, \u0219i anume a AFDD modulare, care func\u021bioneaz\u0103 pe baza semnalului de curent, permi\u021b\u00e2nd instalarea protec\u021biei \u00eempotriva arcului pe liniile secundare, inclusiv \u00een cutiile de distribu\u021bie, cabluri, conexiuni, prize etc., interesul pentru acest subiect cre\u0219te.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent\" src=\"\/wp-content\/uploads\/2019\/05\/f35ab8d139903844857910e809d4c981.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCu toate acestea, produc\u0103torii nu ofer\u0103 prea multe detalii despre structura detaliat\u0103 a produselor modulare (dac\u0103 cineva de\u021bine astfel de informa\u021bii, a\u0219 fi bucuros s\u0103 primesc linkuri c\u0103tre sursele de informa\u021bii), pe de alt\u0103 parte, sistemele de protec\u021bie \u00eempotriva arcului pentru sectorul industrial vin cu un manual de utilizare detaliat de 122 de pagini, care explic\u0103 \u00een mod am\u0103nun\u021bit principiul de func\u021bionare.<\/p>\n<p>S\u0103 lu\u0103m ca exemplu sistemul de protec\u021bie \u00eempotriva arcului VAMP 321 de la Schneider Electric, care include toate func\u021biile de protec\u021bie \u00eempotriva arcului, cum ar fi suprasarcina de curent \u0219i controlul prezen\u021bei arcului.<\/p>\n<p><img decoding=\"async\" alt=\"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent\" src=\"\/wp-content\/uploads\/2019\/05\/1f41efdf7c3b6db7c38b4901a2954927.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Func\u021bionalitate<\/h3>\n<p><\/p>\n<ul>\n<li>Controlul curentului pe trei faze.<\/li>\n<li>Curentul de zero secven\u021b\u0103.<\/li>\n<li>Jurnalele de evenimente, \u00eenregistrarea modurilor de avarie.<\/li>\n<li>Activarea fie simultan pe curent \u0219i lumin\u0103, fie doar pe lumin\u0103, fie doar pe curent.<\/li>\n<li>Timpul de activare a ie\u0219irii cu releu mecanic este de sub 7 ms, iar cu un card IGBT op\u021bional, timpul de activare este redus la 1 ms.<\/li>\n<li>Zone de activare configurabile.<\/li>\n<li>Un sistem continuu de autocontrol.<\/li>\n<li>Dispozitivul poate fi utilizat \u00een diverse sisteme de protec\u021bie \u00eempotriva arcurilor \u00een re\u021belele de distribu\u021bie de tensiune joas\u0103 \u0219i medie.<\/li>\n<li>Sistemul de detectare a flash-urilor arcului \u0219i protec\u021bia \u00eempotriva arcurilor m\u0103soar\u0103 curentul de scurtcircuit \u0219i semnalul prin canalele senzorului de arc \u0219i, \u00een cazul \u00een care apare un scurtcircuit, minimizeaz\u0103 timpul de ardere, deconect\u00e2nd rapid alimentarea cu curent a arcului.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Principiul corela\u021biei matricelor<\/h3>\n<p>\nAtunci c\u00e2nd se stabile\u0219te condi\u021biile de activare pentru un anumit nivel de protec\u021bie \u00eempotriva arcului, se aplic\u0103 o sumare logic\u0103 la ie\u0219irile matricelor de lumin\u0103 \u0219i curent.<\/p>\n<p>Dac\u0103 o treapt\u0103 de protec\u021bie este aleas\u0103 doar \u00eentr-o matrice, aceasta func\u021bioneaz\u0103 ori pe baza condi\u021biei de curent, ori pe cea de lumin\u0103, astfel \u00eenc\u00e2t sistemul poate fi configurat s\u0103 func\u021bioneze doar pe baza semnalului de curent.<\/p>\n<h3>Semnalele disponibile pentru control la programarea treptelor de protec\u021bie:<\/h3>\n<p><\/p>\n<ul>\n<li>Curentii \u00een faze.<\/li>\n<li>Curentul de zero secven\u021b\u0103.<\/li>\n<li>Tensiunile liniare.<\/li>\n<li>Tensiunile fazelor.<\/li>\n<li>Tensiunea secven\u021bei zero.<\/li>\n<li>Frecven\u021ba.<\/li>\n<li>Suma curentilor fazelor.<\/li>\n<li>Curentul secven\u021bei directe.<\/li>\n<li>Curentul secven\u021bei inverse.<\/li>\n<li>Valoarea relativ\u0103 a curentului secven\u021bei inverse.<\/li>\n<li>Raportul dintre curentii secven\u021bei inverse \u0219i celor de secven\u021b\u0103 zero.<\/li>\n<li>Tensiunea secven\u021bei directe.<\/li>\n<li>Tensiunea secven\u021bei inverse.<\/li>\n<li>Valoarea relativ\u0103 a tensiunii secven\u021bei inverse.<\/li>\n<li>Valoarea medie a curentului \u00een faze (IL1+IL2+IL3)\/3.<\/li>\n<li>Valoarea medie a tensiunilor UL1,UL2,UL3.<\/li>\n<li>Valoarea medie a tensiunilor U12,U23,U32.<\/li>\n<li>Coeficientul distorsiunilor neliniare IL1.<\/li>\n<li>Coeficientul distorsiunilor neliniare IL2.<\/li>\n<li>Coeficientul distorsiunilor neliniare IL3.<\/li>\n<li>Coeficientul distorsiunilor neliniare Ua.<\/li>\n<li>Valoarea medie p\u0103tratic\u0103 a IL1.<\/li>\n<li>Valoarea medie p\u0103tratic\u0103 a IL2.<\/li>\n<li>Valoarea medie p\u0103tratic\u0103 a IL3.<\/li>\n<li>Valoarea minim\u0103 a IL1,IL2,IL3.<\/li>\n<li>Valoarea maxim\u0103 a IL1,IL2,IL3.<\/li>\n<li>Valoarea minim\u0103 a U12,U23,U32.<\/li>\n<li>Valoarea maxim\u0103 a U12,U23,U32.<\/li>\n<li>Valoarea minim\u0103 a UL1,UL2,UL3.<\/li>\n<li>Valoarea maxim\u0103 a UL1,UL2,UL3.<\/li>\n<li>Valoarea de fond Uo.<\/li>\n<li>Valoarea medie p\u0103tratic\u0103 a I0.<\/li>\n<\/ul>\n<p><\/p>\n<h3>\u00cenregistrarea modurilor de urgen\u021b\u0103<\/h3>\n<p>\n\u00cenregistrarea modurilor de urgen\u021b\u0103 poate fi folosit\u0103 pentru a salva toate semnalele de m\u0103surare (curen\u021bi, tensiuni, informa\u021bii despre st\u0103rile intr\u0103rilor \u0219i ie\u0219irilor digitale). Intr\u0103rile digitale includ de asemenea semnalele de protec\u021bie din arc.<\/p>\n<h3>Pornirea \u00eenregistr\u0103rii<\/h3>\n<p>\n\u00cenregistrarea poate fi pornit\u0103 de lansa sau de activarea oric\u0103rei trepte de protec\u021bie sau de orice intrare digital\u0103. Semnalul de pornire este ales \u00een matricea semnalelor de ie\u0219ire (segnalul vertical DR). De asemenea, \u00eenregistrarea poate fi pornit\u0103 manual.<\/p>\n<h3>Auto-verificare<\/h3>\n<p>\nMemoria f\u0103r\u0103 energie a dispozitivului este realizat\u0103 folosind un condensator de mare capacitate \u0219i memorie operativ\u0103 cu consum redus de energie.<\/p>\n<p>Atunci c\u00e2nd sursa de alimentare suplimentar\u0103 este activat\u0103, condensatorul \u0219i memoria RAM sunt alimentate de la sursa intern\u0103. C\u00e2nd sursa de alimentare este oprit\u0103, memoria RAM \u00eencepe s\u0103 primeasc\u0103 alimentare de la condensator. Aceasta va p\u0103stra informa\u021biile at\u00e2ta timp c\u00e2t condensatorul poate men\u021bine o tensiune acceptabil\u0103. Pentru o camer\u0103 cu temperatura de +25\u00b0C, timpul de func\u021bionare va fi de 7 zile (umiditatea ridicat\u0103 reduce acest parametru).<\/p>\n<p>Memoria RAM nevolatil\u0103 este utilizat\u0103 pentru stocarea \u00eenregistr\u0103rilor despre modurile de urgen\u021b\u0103 \u0219i jurnalul de evenimente.<\/p>\n<p>Func\u021biile microcontrolerului \u0219i integritatea firelor asociate, \u00eempreun\u0103 cu buna func\u021bionare a software-ului, sunt monitorizate de o re\u021bea de autocontrol separat\u0103. Pe l\u00e2ng\u0103 monitorizare, aceast\u0103 re\u021bea \u00eencearc\u0103 s\u0103 re\u00eencarce microcontrolerul \u00een caz de defec\u021biune. Dac\u0103 re\u00eenc\u0103rcarea nu reu\u0219e\u0219te, dispozitivul de autocontrol trimite un semnal pentru a \u00eencepe indica\u021bia unei defec\u021biuni interne permanente.<\/p>\n<p>\u00cen cazul \u00een care dispozitivul de autocontrol detecteaz\u0103 o defec\u021biune permanent\u0103, acesta blocheaz\u0103 celelalte relee de ie\u0219ire (cu excep\u021bia releului de ie\u0219ire pentru func\u021bia de autocontrol \u0219i a releelor de ie\u0219ire folosite de protec\u021bia Arc).<\/p>\n<p>De asemenea, se controleaz\u0103 sursa de alimentare intern\u0103. \u00cen cazul lipsei aliment\u0103rii suplimentare, se trimite automat un semnal de alarm\u0103. Aceasta \u00eenseamn\u0103 c\u0103 releul de ie\u0219ire pentru defecte interne este activat, dac\u0103 sursa de alimentare suplimentar\u0103 este activat\u0103 \u0219i nu au fost detectate defec\u021biuni interne.<\/p>\n<p>Se monitorizeaz\u0103 unitatea central\u0103, dispozitivele de intrare\/ie\u0219ire \u0219i senzorii.<\/p>\n<h3>M\u0103sur\u0103torile utilizate de func\u021bia de protec\u021bie Arc<\/h3>\n<p>\nM\u0103sur\u0103rile curentului \u00een cele trei faze \u0219i curentului de scurgere la p\u0103m\u00e2nt pentru protec\u021bia Arc sunt efectuate de electronic\u0103. Electronic\u0103 compar\u0103 nivelurile curentului cu valorile de setare \u0219i emite semnale binare \u201cI&gt;&gt;\u201d sau \u201cIo&gt;&gt;\u201d pentru func\u021bia de protec\u021bie Arc \u00een cazul dep\u0103\u0219irii limitelor. Toate componentele curentului sunt luate \u00een calcul.<\/p>\n<p>Semnalele \u201cI&gt;&gt;\u201d \u0219i \u201cIo&gt;&gt;\u201d sunt legate de cipul FPGA, care \u00eendepline\u0219te func\u021bia de protec\u021bie Arc. Precizia m\u0103sur\u0103torii pentru protec\u021bia Arc este \u00b1 15% la 50Hz.<\/p>\n<p><img decoding=\"async\" alt=\"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent\" src=\"\/wp-content\/uploads\/2019\/05\/c1f12088f2d6f4f00acaadac09a254cb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Harmonicii \u0219i distorsiunea total\u0103 armonic\u0103 (THD)<\/h3>\n<p>\nDispozitivul calculeaz\u0103 THD ca procent din curentul \u0219i tensiunile la frecven\u021ba de baz\u0103.<\/p>\n<p>Se iau \u00een considerare armonicile de la a 2-a p\u00e2n\u0103 la a 15-a pentru curentul \u0219i tensiunile de faz\u0103. (Armonica 17 va fi par\u021bial luat\u0103 \u00een considerare \u00een valoarea armonicii 15. Acest lucru se datoreaz\u0103 principiilor m\u0103sur\u0103rii digitale.)<\/p>\n<h3>Modurile de m\u0103surare a tensiunii<\/h3>\n<p>\n\u00cen func\u021bie de tipul de aplicare \u0219i de transformatoarele de curent disponibile, dispozitivul poate fi conectat fie la tensiunea de zero, la tensiunea liniar\u0103 sau la tensiunea de faz\u0103. Parametrul configurabil \u201eMod de m\u0103surare a tensiunii\u201d trebuie s\u0103 fie setat conform conexiunii utilizate.<\/p>\n<h3>Moduri disponibile:<\/h3>\n<p><\/p>\n<h3>\u201eU0\u201d<\/h3>\n<p>\nDispozitivul este conectat la tensiunea de zero. Este disponibil\u0103 protec\u021bia direc\u021bional\u0103 \u00eempotriva scurtcircuitului la p\u0103m\u00e2nt. M\u0103surarea tensiunii liniare, m\u0103surarea energiei \u0219i protec\u021biile \u00eempotriva cre\u0219terii \u0219i sc\u0103derii tensiunii nu sunt disponibile.<\/p>\n<p><img decoding=\"async\" alt=\"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent\" src=\"\/wp-content\/uploads\/2019\/05\/d28c23a5da99f011260962f9d5f22124.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>\u201e1LL\u201d<\/h3>\n<p>\nDispozitivul este conectat la tensiunea liniar\u0103. Este disponibil\u0103 m\u0103surarea tensiunii \u00eentr-o faz\u0103 \u0219i protec\u021biile \u00eempotriva cre\u0219terii \u0219i sc\u0103derii tensiunii. Protec\u021bia direc\u021bional\u0103 \u00eempotriva scurtcircuitului la p\u0103m\u00e2nt nu este disponibil\u0103.<\/p>\n<p><img decoding=\"async\" alt=\"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent\" src=\"\/wp-content\/uploads\/2019\/05\/ef85c9390c7ffe9b21367cceca125f0c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>\u201e1LN\u201d<\/h3>\n<p>\nDispozitivul este conectat la o tensiune de faz\u0103. Se poate m\u0103sura tensiunea \u00eentr-o faz\u0103. \u00cen re\u021belele cu neutral\u0103 legat\u0103 la p\u0103m\u00e2nt \u0219i compensat\u0103, sunt disponibile protec\u021biile \u00eempotriva cre\u0219terii \u0219i sc\u0103derii tensiunii. Protec\u021bia direc\u021bional\u0103 \u00eempotriva scurtcircuitului la p\u0103m\u00e2nt nu este disponibil\u0103.<\/p>\n<p><img decoding=\"async\" alt=\"Sistem de protec\u021bie electric\u0103 cu posibilitate de declan\u0219are pe semnal de curent\" src=\"\/wp-content\/uploads\/2019\/05\/5cb78a2fa82bd50a825f13fad995e134.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Componente simetrice<\/h3>\n<p>\n\u00centr-un sistem trifazat, tensiunile \u0219i curen\u021bii pot fi desf\u0103cu\u021bi \u00een componente simetrice, conform principiului lui Fortescue.<\/p>\n<h3>Componentele simetrice sunt:<\/h3>\n<p><\/p>\n<ul>\n<li>Secven\u021ba direct\u0103.<\/li>\n<li>Secven\u021ba invers\u0103.<\/li>\n<li>Secven\u021ba nul\u0103.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Obiecte controlate<\/h3>\n<p>\nAcest dispozitiv permite controlul a p\u00e2n\u0103 la \u0219ase obiecte, cum ar fi \u00eentrerup\u0103tori, separatoare sau cu\u021bite de \u00eemp\u0103m\u00e2ntare. Controlul poate fi realizat dup\u0103 principiul \u201eselec\u021bie-ac\u021biune\u201d sau \u201econtrol direct\u201d.<\/p>\n<h3>Func\u021bii logice<\/h3>\n<p>\nDispozitivul suport\u0103 logica programat\u0103 a utilizatorului pentru expresiile logice ale semnalelor.<\/p>\n<h3>Func\u021biile disponibile sunt:<\/h3>\n<p><\/p>\n<ul>\n<li>\u0218i.<\/li>\n<li>Sau.<\/li>\n<li>Exclusiv sau.<\/li>\n<li>Nu.<\/li>\n<li>COUNTERs.<\/li>\n<li>Flip-flop-uri RS &amp; D.<\/li>\n<\/ul>\n<p>Sursa: <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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