Analysis and improvement of the biased stator earth fault 100% protection

Abstract

A kind of high resistance grounding methods of generators is few applied by a 3-phase displacement transformer, which is called Pohl (or Bütow) transformer. The secondary asymmetry of the Pohl transformer yields a fundamental zero-sequence displacement voltage so that the biased stator earth fault (SEF) 100% protection can be applied. The law of the… (More)

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