基于二阶电路的开关柜局部放电检测方法  

A partial discharge detection method for switch cabinets based on a second-order circuit

作　　者：林奕夫 叶兆平 陈雪 叶昶 郑书生 曾行毅 LIN Yifu;YE Zhaoping;CHEN Xue;YE Chang;ZHENG Shusheng;ZENG Xingyi(State Grid Fujian Electric Power Co.,Ltd.,Fuzhou 350007,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Fujian Wuyishan Power Supply Co.,Ltd.,Wuyishan,Fujian 354300,China)

机构地区：[1]国网福建省电力有限公司,福州350007 [2]新能源电力系统国家重点实验室(华北电力大学),北京102206 [3]国网福建省电力有限公司武夷山市供电公司,福建武夷山354300

出　　处：《浙江电力》2024年第8期113-120,共8页Zhejiang Electric Power

基　　金：国家电网有限公司科技项目(52130021004Z)。

摘　　要：为了实现高压开关柜局部放电脉冲的高灵敏度带电检测,提出一种基于二阶电路的开关柜局部放电检测方法。首先,构建了包含带电显示装置与检测阻抗的脉冲检测电路,并测量分析了传感、显示单元的电气参数;然后,提出了适用于带电检测的二阶电路,研究了二阶电路以及带电显示装置的电容、电感参数对安全可靠性和检测灵敏度的影响;最后,利用一台10 kV铠装式开关柜与带电显示装置对该方法进行了测试。结果表明:二阶电路检测阻抗不影响开关柜与带电显示装置的安全运行,其检测灵敏度是安装在开关柜接地线上高频CT(电流互感器)的1.6倍。To achieve high-sensitivity live detection for partial discharge(PD)pulses in high-voltage switch cabi⁃nets,a detection method based on a second-order circuit is proposed.Firstly,a pulse detection circuit that includes a charged display device and a detection impedance is constructed,and then the electrical parameters of the sensing and display units are measured and analyzed.Subsequently,a second-order circuit suitable for live detection is in⁃troduced,and the impact of second-order circuit,capacitance,and inductance parameters of the charged display device on safety,reliability and detection sensitivity is studied.Finally,a test is carried out on the proposed method using a 10 kV metal-clad switchgear and a charged display device.The results reveal that the detection impedance of the second-order circuit does not undermine the safe operation of the switchgear and the charged display device.Its detection sensitivity is 1.6 times that of the high-frequency current transformer mounted on the earth wire of the switchgear.

关 键 词：开关柜 局部放电 带电显示装置 二阶电路 检测阻抗 

分 类 号：TM855[电气工程—高电压与绝缘技术]