Grounding Failure Research of Input Side for Locomotive Traction Converter
In order to distinguish the ground failures at different points during locomotive operation,it is generally distinguished by judging the ground voltage waveform change characteristics of the ground voltage sensor.In order to accurately determine the input-side ground failure point with application risk,the input loop of the traction converter is studied,aiming at the failure that the ground voltage waveforms of different ground points are not distinguished when the input side ground failure occurs in the current locomotive traction converter.Judgment logic:By analyzing the variation characteristics of grounding voltage when grounding occurs at different points of the input loop,an optimized detection and judgment logic for grounding failures at different points of the input loop is proposed.Through hardware-in-the-loop simulation and ground test verification,it is shown that by distinguishing the characteristics of ground voltage changes and optimizing the grounding judgment logic of the input side,the grounding failure judgment of the grounding point of the input loop is more accurate,and the shutdown caused by the grounding failure on the input side is greatly reduced.Accidents of locomotive breakage are avoided,and the reliability of locomotive operation is improved.
traction converterfault diagnosisinput side groundinglogic optimizationexperimental verification
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