降低避雷器额定电压或残压对取消750kV线路断路器合闸电阻的影响  

Influence of Lowering Rated Voltage or Residual Voltage of MOA on Canceling the Pre-insert Closing Resistor in 750 kV Circuit Breaker

作　　者：娄颖[1] 李振强[1] 何慧雯[1] 查志鹏[1] 

机构地区：[1]中国电力科学研究院,武汉430074

出　　处：《高压电器》2017年第6期56-60,66,共6页High Voltage Apparatus

基　　金：国家电网公司科技项目(GY71-14-059)~~

摘　　要：目前中国西北地区已投运的750 kV工程避雷器配置基本上是采用750 kV母线侧避雷器额定电压600 kV、线路侧避雷器额定电压648 kV。绝大多数750 kV工程线路断路器装有570~600Ω合闸电阻。根据工频过电压的差异化研究结果,母线侧和线路侧避雷器额定电压在一定范围内均可以进一步降低。避雷器性能提高,避雷器操作冲击电流残压降低,750 kV线路合闸操作过电压水平会相应降低,有利于取消750 kV线路断路器合闸电阻。文中对750 kV工程避雷器额定电压或残压降低后的合闸操作过电压进行了研究,结合操作过电压闪络率的计算,提出了降低避雷器额定电压或残压后取消750 kV线路断路器合闸电阻的适用范围。At present, the 750 kV projects in northwest region of China usually are equipped with the MOAs with rated voltage of 600 kV at bus bar side and 648 kV at transmission line side. Almost all the circuit breakers in the 750 kV transmission lines have pre-inset closing resistors, which resistance is 570-600Ω. According to the research on the differentiation of the power frequency overvoltage, the rated voltage of MOA at both bus bar side and line side can be further reduced in a certain range. Improvement of MOA performance can lower the closing overvohage, accordingly the residual voltage of MOA will reduce, which is in favor of canceling the closing resistor. In this paper, the closing overvohage after reduction of the rated voltage or residual voltage of the MOA for 750 kV projects is investigated. Based on the calculation of the flashover rate due to closing overvoltage, the application range of canceling the closing resistor is suggested.

关 键 词：750 kV工程 避雷器 线路断路器合闸电阻 合闸操作过电压 闪络率 

分 类 号：TM561[电气工程—电器] TM75TM862