特高压输电线路监测终端取能技术的研究与应用  

Research and Application of Energy Acquisition Technologies for UHV Transmission Line Monitoring Terminal

作　　者：汪世平 丁志刚[1,2] 李吉 张吉[1,2] 邓庆 WANG Shiping;DING Zhigang;LI Ji;ZHANG Ji;DENG Qing(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;NARI Technology Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),南京211106 [2]国电南瑞科技股份有限公司,南京211106

出　　处：《浙江电力》2021年第11期46-53,共8页Zhejiang Electric Power

基　　金：南瑞集团有限公司项目(524609190098)。

摘　　要：特高压输电线路监测终端主要用于线路故障的定位与诊断,其取能方式主要为TA(电流互感器)取能,但存在启动电流高、取能电流范围窄的问题。设计了一种单线圈取能电路,采用双门槛晶闸管闭环防护电路以及高启动电压的反激变换电路,实现了低启动电流、宽取能电流范围;阐述了单线圈取能电路的工作原理,进行了计算和仿真分析。开发了一个电流范围15~1500 A、最小输出功率3 W的取能电路,采用该电路的监测终端通过了试验验证并投入现场运行。UHV transmission line monitoring terminal is used for fault location and diagnosis,and its energy acquisition is implemented by an instrument transformer.However,there exist problems of big starting current and narrow current range of energy acquisition.This paper proposes a single-coil energy acquisition circuit that adopts a double threshold thyristor closed-loop protection circuit and a high starting voltage flyback converter to realize low starting current and the wide current range of energy acquisition.The working principle of the single-coil energy acquisition circuit is described,and calculation and simulation are carried out.An energy acquisition circuit with the current range of 15~1500 A and the minimum output power of 3 W is designed.The monitoring terminal with the energy acquisition circuit has passed the experimental verification and been put into field operation.

关 键 词：监测终端 TA取能 单线圈电路 低启动电流 

分 类 号：TM75[电气工程—电力系统及自动化]