The Criterion Reliability Of Single Phase To Ground Fault Detection For The Non-effective Earthing System And Several Criterions Fusing

Fault detection for the non-effective earthing system is a long- standing problem in the operation of ineffectively grounded distribution systems. But the spot records show that the effect is disappointing .The problem isn't solved completely. Traditional single fault-detection method using only some parts of fault information has poor reliability. The paper is based on amending the software arithmetic, and using information fusion, fuzzy set theory to integrate all fault detection method. The idea of intellectualized relay is introduced in fault feeder detection for the non-effective earthing system. The tests and spot records of fault show that this arithmetic is good for all kinds of single fault .