Frequency response testing of zero-sequence current transformers for mining ground fault protection relays
Abstract
W polskim górnictwie węgla sieci dystrybucyjne średniego napięcia działają z izolowanym punktem neutralnym. Przekładniki prądowe o zerowej sekwencji są podstawowymi czujnikami, które generują sygnały wejściowe dla przekaźników zabezpieczających przed zwarciem doziemnym. W literaturze problem analizy odpowiedzi częstotliwościowej różnych typów przekładników prądowych był wielokrotnie badany, np. [1] [2], ale jak dotąd nie dotyczy przekładników prądowych o zerowej sekwencji. W ramach pracy przetestowano dwa typy przekładników prądowych o zerowej sekwencji w zakresie od 0,1 Hz do 100 kHz. Przeanalizowano zarówno zmianę stosunku prądu, jak i przesunięcie kątowe między prądem wtórnym transformatora a całkowitym prądem pierwotnym.References
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