Discrimination of Transformer Excitation Surge Current Based on Time Domain Property of Equivalent Instant Excitation Inductance
Jiao Shao-ling · Electrical Equipment · 2006
According to the mechanism of producing transformer excitation surge current caused by saturation of transformer core, the paper put forward a kind of method to discriminate excitation surge current and short-circuit current adopting calculation of equivalent instant excitation inductance average value. The results of theory analysis, EMTP simulation and TEQSIM mixed simulation show that the principles of this algorithm are distinct, transformer parameters cannot be considered, it can realize the identification of turn to turn light shortcircuit.