Detect Principle Analysis For The Line-to-ground Fault Indicator Base On Signal Injection

Based on location in the distribution network one-phase ground fault location and difficult problem for phase-to-ground fault location and positioning principle is analysed, and analyses the common phase-to-ground fault detection devices. Due to the small current grounding system of its own characteristics, when one-phase ground fault of fault signal itself is weak, the vulnerable, the electromagnetic interference and the harmonic pollution caused by distortion, these are directly affect the location accuracy and selectivity, even maloperation causes route device. Combined with the actual situation of work and the practical characteristics of various devices, using the method of signal into a distribution network location and positioning device one-phase ground fault detection device, which successfully solved the one-phase ground fault location in the distribution of difficult problems.