500 kV龙城输变电工程内过电压计算研究

Study on the Calculation of Internal Overvoltage in Longcheng 500 kV Transmission System

龙城500 k V输变电工程处于500 k V山西中部电网,工程投产对中部电网的运行方式会造成一定影响,需要对调试中可能出现的运行方式进行过电压研究分析。针对工频过电压、操作过电压、潜供电流和恢复电压等进行了计算,并作为制定试验方式和保护措施的依据,同时可以作为同类工程提供建设、启动调试及运行的参考。

Longcheng 500 k V intelligent substation is connected to Jinzhong Substation and Yundingshan Substation through 500 k V transmission Jinlong Line and Yunlong Line. Longcheng Substation is newly built, while Jinzhong Station and Yundingshan Station are transformed projects. Original Yunjing Line was divided into Jinlong Line and Yunlong Line. This transmission system locates in the middle of Shanxi Power Grid, which would have an impact on the operation of Shanxi Power Grid, thus, it is necessary to carry out overvoltage analysis for various operation modes that may happen during the commissioning process. Calculations have been carried out in view of power frequency overvoltage, switching over-voltage, second-arc current and recovery voltage. The results can be taken as basis to set up testing methods and protection measures, meanwhile providing references for the similar projects.