摘要
110 kV并联电容器装置具有单组容量大、电压等级高的特点,而其结构形式和运行工况又与传统并联电容器装置有所区别,因此研究其避雷器参数合理选取原则对于提高其经济性和安全可靠性具有重要意义。以特高压工程110 kV/240 MVA并联电容器装置为研究对象,对其正常分闸重击穿以及单相接地故障情况下单相重击穿时出现的过电压水平进行了理论分析,并在此基础上建立了避雷器吸收能量仿真模型,仿真分析了各种重击穿情况下避雷器的吸收能量以及运行工况对避雷系吸收能量的影响规律,最终提出了最严重工况下避雷器吸收能量的选取建议:如果仅考虑正常分闸重击穿,避雷器吸收能量不小于3 kJ即可;如果考虑单相接地故障情况下的单相重击穿,则避雷器吸收能量应不小于1. 5 MJ,但相对于传统并联电容器装置,该工况出现的概率很低,因此在避雷器选择时,可综合考虑其经济性和可靠性。
110 kV shunt capacitor installation has the characteristics of high voltage level and the large capacity of single group. It differs from the traditional shunt capacitor installation in structures and operation conditions. Therefore,it has great significance for increasing economic benefits and safety reliability by studying the principle of the reasonable selection for arrester parameters. The author takes the 110 kV/240 MVA shunt capacitor installation in ultra-high voltage engineering projects as the research object.The overvoltage level occurred in opening restrike normally and the opening restrike with single line-to-ground fault have been theoretically analyzed. On this basis,the simulation model of the absorbed energy of arrester was established. Simulation analysis for the absorbed energy of arrester in all kinds of restrike has been conducted,as well as the influences of operation conditions on the absorbed energy of arrester. Finally suggestion for the selection of the absorbed energy of arrester in the most severe condition is put forward. If only normal opening restrike been considered,the absorbed energy of arrester should not be less than 3 k J. If the opening restrike with single line-to-ground fault been considered,the absorbed energy of arrester should not be less than 1. 5 MJ. but,it is a small probability event that the opening restrike with single line-to-ground fault occurred in traditional shunt capacitor installation,therefore,the economy and reliability of arrester can be considered comprehensively when selecting arrester.
作者
何慧雯
尹婷
马跃
王子建
HE Huiwen;YIN Ting;MA Yue;WANG Zijian(China Electric Power Research Institute,Wuhan 430074,China;State Grid Corporation of China,Beijing 100031,China;Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China)
出处
《电瓷避雷器》
CAS
北大核心
2021年第1期29-37,共9页
Insulators and Surge Arresters
基金
国家重点研发计划项目(编号:2016YFB0900802)
国家电网公司科技项目(编号:GYW17201600034)。
