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Zeng Q.,Power Supply Company of Nanchang | Hu Z.,Power Supply Company of Nanchang
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2012

The abnormal position signal of an AC integrated automatic protection device for HV switch cabinet during site test is investigated and it is found that the high potential between wires of AC circuit cable induced by the nearby power supply cables causes the abnormality. Three countermeasures are proposed and compared: DC integrated automatic protection device, wall hanging type power supply and separated inter-lock circuit cable. The separated inter-lock circuit cable is designed and implemented, and there is no any abnormality during the operation for about one year, showing its effectiveness. Suggestions are also provided in the type selection and design of secondary cables. Source

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