采用特高压隔离开关切合固定串补平台的电容式电压互感器的快速暂态试验

发布时间：2018-07-06 06:41

本文选题：特高压 + 隔离开关　；参考：《高电压技术》2014年12期

【摘要】：采用特高压(UHV)隔离开关切合串补平台时会产生隔离开关的重复击穿和快速暂态过程,可能导致邻近的电容式电压互感器(CVT)发生故障。为系统研究该暂态过程,通过特高压隔离开关切合串补平台模拟试验,测量了CVT上的过电压水平、快速暂态电压和电流波形,并分析了在CVT高压端上加装保护电阻和保护电感对快速暂态的抑制效果。试验结果表明:隔离开关操作时,CVT端口最大过电压约为1.54倍工频试验电压峰值,远小于其雷电冲击耐受电压,不会对CVT造成严重威胁。快速暂态电流振荡主频为500 k Hz,幅值可达2.2 k A,高幅值和高陡度的快速暂态电流可能会导致CVT内部元件局部过热,并产生局部过电压,进而导致CVT损坏。在CVT高压端加装保护电阻和保护电感能有效限制快速暂态电流的幅值和陡度,对CVT具有较好的保护效果。
[Abstract]:When the UHV disconnector is applied to the series compensation platform, the repeated breakdown and fast transient process of the disconnector will occur, which may lead to the failure of the adjacent capacitive voltage transformer (CVT). In order to study the transient process systematically, the over-voltage level, fast transient voltage and current waveform on CVT are measured by using UHV disconnector to suit series compensation platform simulation test. The suppression effect of protection resistor and inductor on the high voltage end of CVT is analyzed. The test results show that the maximum overvoltage of CVT port is about 1.54 times the peak value of power frequency test voltage, which is far less than its lightning impulse withstand voltage, and will not pose a serious threat to CVT. The main frequency of the fast transient current oscillation is 500 kHz and the amplitude can reach 2.2 Ka. The high amplitude and high steepness of the fast transient current may cause local overheating and local overvoltage of the internal components of CVT, which will lead to the damage of CVT. Adding protective resistor and inductor to the high voltage end of CVT can effectively limit the amplitude and steepness of fast transient current, and it has better protection effect on CVT.
【作者单位】：清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室;中国电力科学研究院;
【基金】：国家电网公司科技项目(SGTGYJSFW[2012]304)~~
【分类号】：TM564.1

【参考文献】