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| Problem and Disposal of PSD’s Insulation for Chengdu Metro |
| LIU Yong-hong |
| China Railway Eryuan Engineering Group Co. Ltd，Chengdu，Sichuan 610031, China |
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Abstract Research purposes:PSD’s insulation has occurred much more trouble since metro N0. 1 & N0. 2 began operations in Chengdu. The worst one is spark of PSD. By analyzing the spark accident, we find the reason and propose the solution practically. Find the reason that the PSD’s insulation decrease，improve its insulation-zone’s efficiency, then we can give advise to the next metro lines PSD’s insulation design，guide the modification of the other operating metro lines and ensure passenger' s safety and comfort.
Research conclusions:PSD’s equipotential body connects with rail potential, during the train runs, the rail potential is charged，so there is large current passing through PSD which causes the weak point of PSD sparking to the ground. If train reaches and stops at the platform，the rail voltage against earth is low and safe，doesn's exceed the safety voltage. When we remove the connection between PSD and rail potential, we can solve the PSD’s sparking trouble. When we paste insulating film on exposed part in stainless steel door of PSD，we can ensure passengers safety when they pass through PSD. During construction ,we should control the production quality and construction quality strictly, ensure the insulating effect, and avoid a series of problem caused by defective insulation.
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Received: 18 November 2013
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2014, Vol. 31 
