500kV并联电抗器开断的过电压及限制措施

Switching On off Over voltage of 500 kV Shunt Reactor and its Restraint Measure

分析了 50 0 k V并联电抗器 (以下简称高抗 )开断的过电压的产生及影响 ,从断路器的并联电阻、避雷器及高抗的投切方式等几个方面探讨了过电压的限制措施及效果 ,并用试验进行验证。理论分析和试验表明 ,切除高抗会产生高达 7倍的过电压。氧化锌避雷器是限制高抗开断的过电压的有效、经济措施 ,能将高抗开断的过电压限制在 3倍以下 ;若再带上线路 ,在远方站间接切除高抗 ,其过电压可限制在 2倍以下。采用这种方式 ,可安全、顺利地切除高抗。

The paper analyses the cause and effect of switching on off over voltage of 500 kV shunt reactor(called high voltage reactor thereinafter),and discusses the restraint measure of over voltage and its effect from several aspects,such as the shunt resistance of breaker,arrester and the switching on off manners of high voltage reactor,and checks them by test.The theoretical analysis and test have showed that switching off high voltage reactor may bring up to 7 times over voltage.The ZnO arrester is a sort of effective,economical equipment used to restraint the high voltage reactor's switching on off over voltage,and can restraint the switching on off over voltage under 3 times.If the line is also considered,and the high voltage reactor is cut off indirectly at remote station,its over voltage can be limited under 2 times.By this way,the high voltage reactor can be switched off safely and successfully.