Design of optical VFTO measuring system

被引：0

作者：

Qiu J. ^{[1
,2
]}

Ruan J. ^{[1
]}

Wu S. ^{[2
]}

Mao A. ^{[2
]}

Xu S. ^{[2
]}

Wang L. ^{[2
]}

Zhang F. ^{[3
]}

机构：

[1] School of Electrical Engineering, Wuhan University, Wuhan

[2] China Electric Power Research Institute, Wuhan

[3] NAE(Beijing) Electric Control Technology Ltd., Beijing

来源：

Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2017年 / 37卷 / 02期

关键词：

Capacitance measurement; Frequency band; Gas insulated switchgear; Optical measuring; Optical sensor; Very fast transient over-voltage;

D O I：

10.16081/j.issn.1006-6047.2017.02.031

中图分类号：

学科分类号：

摘要：

An optical method of VFTO(Very Fast Transient Over-voltage) measuring based on Pockels effect is proposed. The primary signals of VFTO is acquired by the optical sensing head and transmitted via optical cable to the electric cells, where they are analyzed for obtaining the actual voltage. The optical sensor has high reliability, strong anti-interference ability, high measurement accuracy and wide frequency band. The low cut-off frequency of the designed optical sensor is lower than 10 Hz and its high cut-off frequency is higher than 1 GHz. A test system is applied to measure the VFTO generated by isolator operation, which collects the signals synchronously acquired by both optical sensor and capacitor-type sensor. Comparison of the measured waveforms verifies the feasibility of the designed optical measuring method of VFTO. The test results show that, both the capacitance measurement method and the optical measurement method reflect the process of breaker close/open operation;the close/open operation durations measured by both methods match well;the VFTO oscillation amplitude measured by capacitance measurement method is obviously smaller than that of optical measurement method;and the measuring performance of optical measurement method in high-frequency band is better than that of capacitance measurement method. Key words: © 2017, Electric Power Automation Equipment Press. All right reserved.

引用

页码：205 / 210

页数：5

共 23 条

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