Scheme of Flexible Control Very Fast Switch and Its Discharge Characteristics for Distribution Network

被引：0

作者：

Dong B. ^{[1
]}

Chen Z. ^{[1
]}

Chen W. ^{[2
]}

Li Z. ^{[3
]}

Xu X. ^{[3
]}

Wu Z. ^{[4
]}

机构：

[1] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei

[2] State Grid Corporation of China, Beijing

[3] China Electric Power Research Institute, Beijing

[4] Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd., Hefei

来源：

Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 05期

关键词：

Distribution network; Flexible control very fast switch; Gas gap switch; Induced breakdown; Trigger parameters;

D O I：

10.13336/j.1003-6520.hve.20220136

中图分类号：

学科分类号：

摘要：

The problem of frequent power outages and low voltage caused by heavy overload of distribution transformers has become increasingly prominent year by year, thus the voltage sags and interruptions may result in serious losses and hazards. The problem of insufficient rapid control and protection capability of traditional switching equipment has become increasingly prominent. Consequently, we analyzed the application scenarios of rapid switching of standby power in distribution network firstly, and innovatively proposed a flexible control very fast switch (FCVFS) scheme for distribution network. It is considered that the working performance of FCVFS mainly depends on the trigger performance of gas gap switch. Furthermore, we designed the gas gap switch prototypes, and built a trigger test platform to study the development characteristics of the jet plasma and its influence during the induced breakdown process. The results show that the SF6 gas gap switch conduction process can be divided into two stages, namely, pre-breakdown and main gap induced breakdown. The pre-breakdown stage plays the role of ignition. In this stage, the peak plasma jet height (6.1 mm) and the maximum jet velocity (0.45 km/s) are 4 times and 2 times those of the main gap-induced breakdown. With the increase of pulse capacitance and charging voltage, the plasma jet characteristic parameters (jet velocity, jet height, jet diameter and jet area) gradually increase. Increasing the operating coefficient, the trigger delay of gas gap switch and the critical height of plasma jet decrease when the main gap breaks down. There are obvious differences in the development process of jet plasma between air and SF6 gap switch, and SF6 has obvious inhibitory effect on the development of jet plasma. The research results have reference significance for improving the economy and flexibility of the rapid closing technology of distribution network. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：1808 / 1816

页数：8

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