Research on Ground Leakage Protection of Traction Power Supply System for Medium and Low Speed Maglev Traffic
Aiming at the problem of multiple substation tripping caused by overcurrent protection of ground leakage protection device(64D)for medium and low speed maglev traffic,this paper establishes a ground leakage fault model,and uses analytical and simulation methods to analyze the influence of different parameters on the performance of 64D device,and puts forward improvement measures for ground leakage protection based on the characteristics of feeder leakage current.The improved ground leakage protection device,by comparing the sum of the feeder leakage current of two adjacent substations in the same power supply section with the set value in networking mode and combining with the polarity of the feeder leakage current in no networking mode,can accurately cut the feeder circuit breaker in the fault section and ensure the normal operation of trains in other power supply sections.
medium and low speed maglev trafficground leakage protectionprotection scheme
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