Abstract：Research purposes:The DC frame leakage fault is the fault that can cause the big influence on the power supply system．Once this fault occurs，it will cause the large － scale power cut，and affect the normal running of the train．So reducing the scale influenced by the frame leakage fault and finding out the fault position rapidly and exactly are very crucial to shortening the power cut time and recovering the power supply as soon as possible．This paper researches and analyzes the three main schemes for frame leakage protection for getting the best cost performance scheme．
Research conclusions:The scheme of installing two sets of frame leakage protection devices is recommended． Namely，one set is for rectifiers and negative pole cabinet and the other one is for DC switch gears． With this scheme，the scale influenced by the fault can be reduced，the power cut time can be shortened，the reliability of the DC power supply system can be enhanced and the best cost performance can be obtained． So this scheme can be widely used in the projects．In addition，it is proposed it will be better to use this scheme along with the scheme of adopting the breaker in the DC incoming switch gear．
王丽伟. 地铁直流框架泄漏保护设置方案分析[J]. 铁道工程学报, 2012, 29(12): 108-112.
WANG Li － wei. Scheme Analysis of Metro DC Frame Leakage Protection. 铁道工程学报, 2012, 29(12): 108-112.
GB /T 25890． 7—2010，Railway Applications － Fixed Installations － DC Switchgear － Part 7 － 1: Measurement， Control and Protection Devices for Specific Use in d． c． Traction Systems － Application guide ［S］．
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2012, Vol. 29 
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