基于传输系数的HFCT电气参数测试方法研究  

Test Method for Electrical Parameters of HFCT Based on Transmission Coefficient

作　　者：周凯[1] 黄永禄 何珉[1,2] 万航 谢敏 曾琴[1] 赵世林 ZHOU Kai;HUANG Yonglu;HE Min;WAN Hang;XIE Min;ZENG Qin;ZHAO Shilin(School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China;Electric Power Research Institute of State Grid Chongqing Electric Power Company,Chongqing 401123,China)

机构地区：[1]四川大学电气信息学院,成都610065 [2]国网重庆市电力公司电力科学研究院,重庆401123

出　　处：《高压电器》2018年第11期301-306,共6页High Voltage Apparatus

摘　　要：目前,局部放电检测技术被认为是电力设备绝缘状态评估有效手段。其中基于电磁耦合法的高频电流传感器(HFCT)广泛应用于电力设备局放检测中。为了评估HFCT的性能,提出了一种基于传输系数的HFCT电气参数测试新方法。首先对HFCT进行电路等效和分析,并提出HFCT电气参数的测试方法和测试原理,同时利用网络分析仪和固定的测试夹具搭建测试系统;然后对测试系统进行电路等效和分析,得到网络分析仪测量的传输系数与HFCT的传递函数、传输阻抗之间的关系,并根据传输系数得到HFCT的带宽、上下限频率和传输阻抗;最后对多个HFCT进行实际测试,并统计各HFCT的带宽、上下限频率和灵敏度。测试结果表明,该测试方法能够快速、稳定地获取HFCT的电气参数,为HFCT性能评估提供数据支撑。High frequency current transducer （HFCT）based on electromagnetic coupling method has been widely used in partial discharge detection of power equipment. In order to evaluate the performance of HFCT, a new method for testing the electrical parameters of HFCT based on the transmission coefficient was presented. Firstly, the test methods and test principle for the electrical parameters of HFCT were put forward based on equivalent circuit and analysis of HFCT, and the test system was built by using the network analyzer and the test fixture. Then, through the equivalent circuit and analysis of the test system, the relationship between the HFCT transmission coefficient mea- sured by the network analyzer, the transfer function and transmission impedance were obtained, and the bandwidth, upper and lower frequencies, and transmission impedance of HFCT were obtained according to the transmission coefficient. Finally, actual test was conducted on a number of HFCTs to obtain the bandwidth, upper and lower frequencies, and sensitivity of the HFCTs. Test results show that this test method can acquire electrical parameters of HFCT rapidly and stably, and provide data support for evaluating the performance of HFCT.

关 键 词：高频电流传感器 网络分析仪 传输系数 传输阻抗 测试夹具 传递函数 

分 类 号：TM855[电气工程—高电压与绝缘技术]