高压电器2025，Vol.61Issue(8)：14-21,8.DOI:10.13296/j.1001-1609.hva.2025.08.002
GIS隔离开关触头间击穿电弧长度对VFTO波形的时域和频域特征影响分析
Analysis of Influence of Breakdown Arc Length Between Contacts of GIS Disconnector on Time and Frequency Domain Characteristics of VFTO Waveform
摘要
Abstract
In case of switching short busbar by GIS disconnector,VFTO will be generated between contacts during the transient breakdown,which poses a serious threat to the insulation of equipment.The breakdown distance be-tween contacts is related to the impedance characteristics of the arc,which affects the time and frequency domain dis-tribution characteristics of VFTO.In order to study the influence of the breakdown arc length between contacts of GIS disconnector on the waveform characteristics of VFTO,in the test duty 1 of switching short short busbar by GIS dis-connector,the ultra-widebande voltage measurement system based on the capacitive voltage division is used to accu-rately measure whole VFTO waveform of DC side during closing operation of disconnector.Then,the VFTO wave-forms excited by the first 15 times breakdowns are extracted for time domain,frequency domain and time-frequency distribution analysis.It is found through the analysis that when the length of the breakdown arc between contacts is decreased from 100 mm to 30 mm,the excited duration of time domain waveform of VFTO and the mutation charac-teristic time of wave-head have no obvious change.The fluctuation range of overshoot coefficient becomes small and has no obvious influence on the maximum overshoot coefficient.In case of reduction of the distance between conatcts,the characteristic frequency point above 50 MHz is gradually reduced with the decrease of arc length,and the maxi-mum instantaneous frequency is decreased from 100 MHz down to 70 MHz.The frequency component above 50 MHz is decreased with the arc length and the duration is shortened.After the distance between conatcts is less than 30 mm,the characteristic frequency above 20 MHz has obvious deviation.The research in this paper provides a strong support for optimizing high frequency model of arc and the structure design of GIS disconnector further.关键词
GIS隔离开关/开合短母线/特快速暂态过电压/电弧长度/时频特征Key words
GIS disconnector/switching of short busbar/very fast transient over-voltage/arc length/time-frequency domain characteristics引用本文复制引用
廖钧,丁登伟,刘卫东,何雨峰,易祺,何大猛,何良..GIS隔离开关触头间击穿电弧长度对VFTO波形的时域和频域特征影响分析[J].高压电器,2025,61(8):14-21,8.基金项目
国家自然科学基金(51977120) （51977120）
四川省自然科学基金项目(2024NSFSC0117). Project Supported by National Natural Science Foundation of China(51977120),Sichuan Natural Science Foundation(2024NSFSC0117). （2024NSFSC0117）
