Time and Frequency Domain Characteristics of Transient Voltage Excited by Insulation Breakdown in UHV GIL

被引：0
|
作者：
Ding D. [1 ]
Han X. [2 ]
Wang N. [2 ]
Liu W. [1 ,3 ]
Zhang P. [2 ]
Zhang Z. [1 ]
机构：
[1] Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu, 610213, Sichuan Province
[2] State Grid Corporation of China, Xicheng District, Beijing
[3] Department of Electrical Engineering, Tsinghua University, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2020年 / 44卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Broadband voltage sensing; frequency domain characteristics; Insulation breakdown; Time and; Transient voltage monitor; UHV GIL;
D O I：
10.13335/j.1000-3673.pst.2019.2531
中图分类号：
学科分类号：
摘要：
In order to study the characteristics of transient voltage excited by insulation breakdown during the resonance voltage withstand test and the operation of ultra-high voltage (UHV) gas insulated metal-enclosed transmission line (GIL), this paper uses the broadband transient voltage monitoring system installed in 1100kV Sutong GIL utility tunnel project to accurately measure the transient voltage generated by insulation breakdown. The duration, the change steepness and the amplitude attenuation of the transient voltage waveform generated by typical GIL fault under different conditions are analyzed firstly. The frequency characteristics of transient waveform are analyzed in Fourier transform, and it is found that the characteristic frequency is closely related to the fault location. Finally the time-frequency characteristics of transient voltage are analyzed in the continuous wavelet transform. It is discovered that the instantaneous frequency of the steep voltage exceeds 3MHz. It can accurately estimate whether the GIL has secondary discharge through the time-frequency distribution of the transient voltage. By analyzing the time and frequency domain characteristics of the transient voltage, it is helpful to understand the generation and propagation characteristics of the transient traveling voltage in GIL, accurately evaluate the damage of the transient voltage to the insulation of GIL, and improve the operation reliability of UHV GIL. © 2020, Power System Technology Press. All right reserved.
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页码：2393 / 2400
页数：7
相关论文
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