采用TEV传感器的开关柜局部放电检测技术研究与实现  

Research and Implementation of Partial Discharge in HV Switchgear Using TEV Sensor

作　　者：黄世龙[1] 王晓辉[2] 郭旭敏 李岩松 赵涛[1] 刘云鹏[1] 

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,河北保定071003 [2]河南省电力公司,郑州450000 [3]汕头市供电局,广东汕头515041 [4]江苏省电力公司检修分公司无锡分部,江苏无锡214101

出　　处：《高压电器》2016年第10期19-26,共8页High Voltage Apparatus

基　　金：国家高技术研究发展计划项目(863计划)(2012AA050802)~~

摘　　要：分析了开关柜内发生局部放电时柜体表面产生暂态地电压原理及TEV传感器设计原理。依据设计原理研制了一种TEV传感器，运用TEV传感器对3种典型开关柜缺陷模型进行了试验研究。并对放大检波前后的TEV信号进行了分析。基于所设计的TEV传感器、放大检波电路以及超声波法研制了一套开关柜局部放电检测装置，并运用该装置对多个变电站进行了实测。结果表明：TEV原始信号幅值低于100mV，能量分布在3～200MHz之间；所设计的放大检波电路提高了原始TEV信号的信噪比，降低了采集难度，试验研究和现场测试验证了该套检测装置的有效性。The mechanism of transient earth voltages（TEV）aroused by partial discharge in switchgears and the design mechanism of the TEV sensor are analyzed, the TEV sensor is designed according to its design mechanism and is used to record the TEV information corresponding to three typica PD models in HV switchgears. The origi- nal and after-amplifying-modulating TEV signal is analyzed. Detection system is developed combining with TEV sensor, amplifier demodulation and AE method. The system has been tested in several substations. The results show that, the amplitude of TEV original signal is lower than 100 mV, the energy distribution is lied in the frequency of 3 MHz to 200 MHz. The designed amplification demodulation circuit has improved the SNR and reduced the difficulty of collecting： Experimental research and field application verify the effectiveness of the system.

关 键 词：开关柜 局部放电 TEV传感器 缺陷模型 放大检波 

分 类 号：TM591[电气工程—电器]