Single-Phase Grounding Fault Location in the Small Current Grounding System

The traditional fault detection's principle and method for the non-effectively grounded system is analyzed in the operation of ineffectively grounded distribution systems. A new location method of single-phase earth fault detection is proposed, based on morphology's line selection principle. This method progresses morphological grade filter to zero sequence current waveform, the fault point is detected through analyzing the similarity between every zero sequence current point. At the same time, the simulation model of on-effectively grounded system is built as the analysis object, the MATLAB is used to simulate and confirm the line selection method of morphology. A simulation test is used to get the judging effective of fault location when setting the different location of grounded point. The results of simulation show that this arithmetic is accurate and reliable, and own higher practicability and engineering practice significance.