特高压输电线路雷击闪络电流的测量  

Measurement of Lightning Flashover Current on Ultra High Voltage Transmission Lines

作　　者：程养春[1] 李成榕 陈家宏[3] 张勤[3] 汤明[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]北京市高电压与电磁兼容重点实验室,北京102206 [3]国网武汉高压研究院,武汉430074

出　　处：《高电压技术》2007年第6期9-12,共4页High Voltage Engineering

摘　　要：为测量雷电参数,提出一输电线路杆塔的雷电流实测系统即在绝缘子串杆塔侧金具上钳套罗果夫斯基型电流传感器,测量雷击时的闪络电流,进而算出雷电流幅值;以110kV同杆双回线路为例,分析了反击和绕击时闪络电流的频谱,从而确定了传感器的测量频带。实验室中冲击大电流试验研究传感器及测量系统准确性、稳定性和线性度的试验表明:该测量系统能准确反映各种波形的冲击电流幅值,且稳定性和线性度很好。A kind of lightning current measuring system was put forward, in which a Rogowski coil sensor was clamped around the grounded metal terminal of insulator strings to measure the flashover current magnitude, so as to calculate the magnitude of the lightning current. This system needs no power supply and transmits signal by light fiber. Taking a 110kV transmission line into account, the frequency spectrum of back flashover current and shield fault current is analyzed to decide the frequency band of the sensor. At laboratory, tests of large impulse current have been carried out to study the accuracy, stability and linearity of the measurement system. The results indicate that the system can get the accurate amplitude of every shape of impulse current, and has very good stability and linearity. So this new measurement system is able to measure the lightning current magnitude, and has excellent performance.

关 键 词：传感器 雷电流 测量 罗果夫斯基线圈 特高压 输电线路 

分 类 号：TM835[电气工程—高电压与绝缘技术]