特高压输电线路直流电场的斩波测量方法

doi:10.11985/2019.01.003

摘要/Abstract

摘要：

为了检测特高压直流输电线路走廊下的直流电场强度,提出了直流电场的斩波测量方法。采用高绝缘干簧继电器对感应金属极板电场传感器直流电压信号进行斩波,在探测传感器不作机械运动的情况下,将直流电压信号转变为一个低频交变的方波信号,再利用极高输入阻抗的运算放大器电路,实现对直流电场的测量。设计了测量系统硬件和软件,实验测试结果表明,该方法可行、有效。

关键词: 特高压, 输电线路, 直流电场, 斩波

Abstract:

In order to detect the DC electric field strength under extra-high voltage DC transmission lines, a new chopping measurement method of DC electric field strength is presented. The DC voltage signal caused by induction metal pad of electric field sensor is chopped. At first, the DC voltage signal is transformed to a low frequency AC square wave signal when the detecting sensor is no mechanical movement. Then the DC electric field strength is measured by using the operational amplifier circuit with extreme input impedance. The hardware and software of the measuring system are designed. The experiment testing results show that this method is feasible and effective.

Key words: Extra-high voltage, transmission lines, DC electric field, chopping

中图分类号:

TM835

周子舒,刘洋. 特高压输电线路直流电场的斩波测量方法[J]. 电气工程学报, 2019, 14(1): 15-20.

ZHOU Zishu,LIU Yang. Chopping Measurement Method of DC Electric-Field Strength Under Extra-High Voltage DC Transmission Lines[J]. Journal of Electrical Engineering, 2019, 14(1): 15-20.

图/表 6

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表2

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参数	取值
输入偏置电流/fA	≤±1
输入失调电压/μV	<±500
差模输入阻抗/(Ω//pF)	1 013 //1
共模输入阻抗/(Ω//pF)	1 015 //2
开环电压增益/dB	>110 dB

信号幅值U/mV	测量强度E/(kV/m)
14.1	5.135
32.4	10.273
89.7	20.164
137.5	29.898
184.6	40.027
227.3	50.272