Partial Charge On-Line Monitoring System Research Of Direct Current Feeder Cable Of Urban Mass Transit

The power supply is one of major factors for the running security of track transportation. The direct current (DC) feeder cable is one of the key devices for the safety operation of mass transit system. The insulation of DC feeder cable is serious hidden trouble factor threatened the operation safety of mass urban transit. Therefore, carrying out research on the insulation diagnosis technology of the cable to getting the insulation status of the cable timely not also embodies the economic benefit but also adequate social benefit.At present, the testing methods for the DC feeder cable are mainly off-line measuring resistance of cable periodically and kinds of protections alarming. Firstly, the thesis reviewed the current diagnosis technology on the insulation of DC cable of mass urban transit. The results of analysis indicate the implemented diagnosis technology, off-line periodic testing and motion alarming of kinds of protection, didn’t meet the demand of safety operation of urban transit, therefore the new fault predicting technology, on-line monitoring detection, shall be adopted.The dissertation analyses and compares the current on-line monitoring detection methods and decides to adopt the method of partial charge electromagnetism coupling. The dissertation describes the system particularly including its hardware、software and insulation diagnosis. After installed, this system successfully detected one unusual signal which demonstrated the stability and validity of this system. At the end of the dissertation, a systematical summary was given and further work to the research was also pointed out.