断路器并联电容介质损耗超标分析Analysis on Exceeded Dielectric Loss of Shunt Capacitor in Circuit Breaker
沈曼盛,周路遥,詹江杨,杨智,刘浩军,廖玉龙
SHEN Mansheng,ZHOU Luyao,ZHAN Jiangyang,YANG Zhi,LIU Haojun,LIAO Yulong
摘要(Abstract)：
监测断路器并联电容介质损耗(简称"介损")是保证其安全稳定运行的一项重要工作。针对某变电站500 kV断路器在预防性试验时(10 kV试验电压下)出现断口间膜纸复合绝缘并联电容介损超标问题,进行高压介损试验,并绘制tanδ-U介损特性曲线作为参考。试验结果表明:介损值随试验电压升高而减小,且较低试验电压下的介损值为较高试验电压下介损值的若干倍,可以判定为Garton效应影响所致。对此,可采用减少混入绝缘中的杂质含量、增加RTV(室温硫化硅橡胶)防污闪涂料、减少无电静置时间等对策,以减小Garton效应对电容介损测量的影响。
Dielectric loss detection of shunt capacitor in a circuit breaker is an important task to ensure operation safety and stability operation of the circuit breaker. In view of the exceeded dielectric loss of film-paper composite dielectric shunt capacitor in 500 kV circuit breaker in the preventive experiment(10 kV test voltage) in a substation, high-voltage dielectric loss experiment was conducted and the tanδ-U dielectric loss curve was drawn for reference. The experimental results show that the dielectric loss decreases with the increase of the test voltage, and the dielectric loss at a lower test voltage is several times that at a higher test voltage, which can be judged as the Garton effect. In order to reduce the influence of Garton effect on dielectric loss measurement, countermeasures such as reducing the content of impurities mixed in the dielectric, increasing the RTV(room temperature vulcanized silicone rubber) antifouling flashover coating, and reducing the time for uncharged standstill can be adopted.
关键词(KeyWords)：
并联电容;膜纸复合绝缘;介质损耗;Garton效应
shunt capacitor;film-paper composite;dielectric loss;Garton effect
基金项目(Foundation): 国网浙江省电力有限公司科技项目(5211DS16002Q)
作者(Author):
沈曼盛,周路遥,詹江杨,杨智,刘浩军,廖玉龙
SHEN Mansheng,ZHOU Luyao,ZHAN Jiangyang,YANG Zhi,LIU Haojun,LIAO Yulong
DOI: 10.19585/j.zjdl.201812014
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