基于电流转移的CO<sub>2</sub>气体断路器动态介质恢复特性

doi:10.19595/j.cnki.1000-6753.tces.181188

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摘要为提高CO₂气体断路器动态介质恢复强度,首先提出采用串联晶闸管与限流电阻串联的电流转移提升其动态介质恢复强度的方法,建立基于电流转移的CO₂气体断路器开断仿真模型,仿真结果证明了增加电流转移可在一定程度上提高其动态介质恢复强度。然后搭建基于电流转移的CO₂气体断路器动态介质恢复特性实验平台,实验研究了有/无电流转移、不同转移电阻、不同提前过零时间等条件下其动态介质恢复强度及增益效果。研究结果表明：CO₂气体断路器动态介质恢复强度随提前过零时间增加逐渐增大;提前过零1.2ms时CO₂气体断路器在电流过零后1ms其耐压水平已达20kV以上,为无转移时的2倍以上,已满足一定绝缘要求;选取200~250mΩ转移电阻为“最优”转移电阻,可实现CO₂气体断路器“最优”动态介质恢复强度。实验结果可为大容量CO₂气体断路器研制奠定基础。

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关键词 ： CO₂气体, Mayr电弧模型, 动态介质恢复强度, 电流转移

Abstract：In order to improve the dynamic dielectric recovery strength（DDRS）of the CO₂ gas circuit breaker (GCB), The current commutation method which consists of serial thyristors and current-limiting resistors is proposed to connect with the CO₂ GCB. The simulation model of the CO₂ GCB based on current commutation is established and the simulation results indicate that the current commutation method can enhance the DDRS of the CO₂ GCB. The test platform of the GCB is set up in order to investigate the DDRS. The influence of the current commutation method, different current-limiting resistors and different zero-current duration on the DDRS of the CO₂ GCB is researched. The test results indicate that the DDRS of the CO₂ GCB increases as the zero-current duration increases .The breakdown voltage is above 20kV after the main current zero when the zero-current duration is 1.2ms so that the DDRS with the above current commutation is much twice than that without current commutation. The best DDRS can be achieved by adjusting the current-limiting resistor from 200mΩ to 250mΩ. The paper supplies the base for the application of the CO₂ GCB.

Key words： CO₂ gas Mayr arc model dynamic dielectric recovery strength current commutation

收稿日期: 2018-07-09 出版日期: 2019-12-11

PACS:

TM561

基金资助:国家自然科学基金（51977195, 51777025）、中国博士后科学基金（2017M622370）、河南省高校重点科研项目（16A470014, 19A470008）和国家轨道交道电气化与自动化工程技术研究中心开放课题（NEEC-2017-B07）资助

通讯作者: 葛国伟男,1987年生,博士,讲师,研究方向为多断口真空开关技术、真空电弧动态恢复特性等高压电器及高电压新技术。E-mail：ggw@zzu.edu.cn

作者简介: 程显男,1982年生,教授,博士生导师,研究方向为混合断路器、多断口真空开关等高压电器及高电压新技术。E-mail：chengxian@zzu.edu.cn

引用本文:

程显, 杨培远, 葛国伟, 程子霞, 王华清. 基于电流转移的CO₂气体断路器动态介质恢复特性[J]. 电工技术学报, 2019, 34(23): 5030-5038. Cheng Xian, Yang Peiyuan, Ge Guowei, Cheng Zixia, Wang Huaqing. Dynamic Dielectric Recovery Characteristics of CO₂ Gas Circuit Breaker Based on Current Commutation. Transactions of China Electrotechnical Society, 2019, 34(23): 5030-5038.

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