高电压技术2025，Vol.51Issue(7)：3234-3244,11.DOI:10.13336/j.1003-6520.hve.20240987
采用GIS局部放电UHF传感器的宽频带电压测量方法
Wide-band Voltage Measurement Method by Using GIS Partial Discharge UHF Sensor
摘要
Abstract
In order to meet the needs of wideband voltage measurement such as recording power system fault waveforms and fault location by using partial discharge UHF sensor in gas insulated switchgear(GIS),this paper designs a low-voltage arm circuit for partial discharge UHF sensor in GIS,and conducts experimental research on its characteristic.In the voltage division part,a two-stage capacitor voltage divider is applied to meet the requirements of high voltage divi-sion ratio and high frequency characteristic.In terms of improving low-frequency performance,this paper adds an impedance converter module after the output signal of the second-stage voltage division part.To filter the high-frequency oscillation caused by the sensor's own structure,a four-pole Sallen-Key low-pass filter is connected after the impedance converter module.The low-frequency characteristic of the measurement system can be acquired by measuring the expo-nential discharging signal fall time after charging.This paper designs a step pulse generator to obtain the high frequency cut-off frequency through step response.The output signal rise time of the generator is less than 5 ns,and the output volt-age is adjustable from 5 000～30 000 V.Through experimental testing,the measurement system in this paper realizes a wideband transient voltage measurement with a bandwidth from 0.14 Hz to 9.1 MHz.关键词
局部放电UHF传感器/宽频带电压测量/两级电容分压/阻抗变换/Sallen-Key低通滤波器/频率特性Key words
partial discharge UHF sensor/wideband transient voltage measurement/two-stage capacitor divider/im-pedance converter/Sallen-Key low-pass filter/frequency characteristic引用本文复制引用
胡方言,丁登伟,孙强,刘卫东..采用GIS局部放电UHF传感器的宽频带电压测量方法[J].高电压技术,2025,51(7):3234-3244,11.基金项目
国家重点研发计划(2022YFB2403700 （）
2022YFB2403705).Project supported by National Key R&D Program of China(2022YFB2403700,2022YFB2403705). （2022YFB2403700,2022YFB2403705）
