Research And Realization On Zero Sequence Phasor Method For On-Line Fault Location In The Distribution Network

In order to solve the problem of on-line location of single line-to-ground fault in the neutral point non-grounded system,this thesis proposes a zero sequence phasor method for on-line fault location which is based on the synchronized phasor of zero sequence voltage and current.On this basis,including the effect of measurement error,the thesis puts forward this method's practical criterion.The crucial technology of zero sequence phasor method is the overhead line's movable measurement of zero sequence current,synchronized measurement of zero sequence phasor.This thesis applies the phase synthesis and inductive method to realize the overhead line's movable zero sequence current measurement.The application of GPS technique achieves the synchronized measurement of zero sequence phasor.Based on the wireless radio frequency technology,the measurement information is able to transfer between different locations.An on-line fault location system is developed on the basis of zero sequence current measurement system and zero sequence voltage measurer.In this thesis,the charged fault location experiment is carried out on physical model of the 10kV neutral point non-grounded distribution system,which testify the accuracy of zero sequence phasor method and the validity of on-line fault location system.