Analysis and Countermeasure Study on DC Bias of Main Transformer in a City
[摘要] According to the December 2015 Guohua Beijing thermal power transformer DC magnetic bias phenomenon, the monitoring data of 24 hours of direct current is analyzed. We find that the maximum DC current is up to 25 and is about 30s for the trend cycle, on this basis, then, of the geomagnetic storm HVDC and subway operation causes comparison of the mechanism, and make a comprehensive analysis of the thermal power plant's geographical location, surrounding environment and electrical contact etc.. The results show that the main reason for the DC bias of Guohua thermal power transformer is the operation of the subway, and the change of the DC bias current is periodic. Finally, of Guohua thermal power transformer DC magnetic bias control method is studied, the simulation results show that the method of using neutral point with small resistance or capacitance can effectively inhibit the main transformer neutral point current.
[发布日期] [发布机构] Xinjiang Economic and Technology Research Institute of State Grid, Xinjiang; 830000, China^1;Urumqi Electric Power Company of State Grid, Xinjiang; 830000, China^2;Anhui Electric Power Technology Co. Ltd., Anhui; 230000, China^3
[效力级别] 无线电电子学 [学科分类]
[关键词] Comprehensive analysis;Dc magnetic bias;Electrical contacts;Geographical locations;Geomagnetic storm;Main transformer;Surrounding environment;Thermal power plants [时效性]
