Abstract
Aiming at the inevitable pantograph-catenary off-line arc when electric multiple units (EMUs) run, the CRH3 EMUs, which operate at China Chongqing–Lichuan line, are selected as the research subject. Vehicle body voltage caused by the pantograph-catenary off-line arc is analyzed. First, the structure of the vehicle body and CRH3 EMUs grounding system are studied. Second, based on PSCAD/EMTDC software, electric parameters of traction network and CRH3 EMUs are ascertained, then a coupling model of vehicle-grid system is established, and an extended pantograph-catenary arc model is utilized to simulate pantograph-catenary off-line when vehicles run. Through the pantograph-catenary off-line model, vehicle body overvoltage distribution is analyzed. Finally, aiming at the CRH3 EMUs grounding system, corresponding methods are proposed to suppress vehicle body overvoltage.
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