一起直流接地事件的分析及改造  

Analysis of one grounding fault in DC system and modification

作　　者：赖志刚[1] 毛鹏[1] 杨杰[1] 

机构地区：[1]江西省电力公司超高压分公司,江西南昌330006

出　　处：《电力系统保护与控制》2009年第12期106-108,共3页Power System Protection and Control

摘　　要：变电站直流系统对于保护的正确动作至关重要。结合某500kV变电站一起直流系统接地事件,详细分析了事件的排查过程,最后确认是由于UPS绝缘隔离原因,以及UPS电源应用不当等综合因素,导致交流系统串入直流系统,致使直流系统对地绝缘下降,部分间隔指示信号灯亮度异常,严重影响变电站二次系统的正常运行。最后提出了具体的整改措施和设备验收、检验建议。DC system in substation is important to correct performances of protective relays. One grounding fault in 500kV substation is presented in this paper, and the detecting process is analyzed in detail. Because of integrated factors such as badness of insulation in UPS equipment and improper application of UPS source, the AC source is inducted into the DC system. So the insulation degradation between the DC system and the earth is caused and some signal lamps unconventionally glowed. The event badly affects the normal running of the secondary system in substation. The improved measure and some advices are presented finally.

关 键 词：直流系统 接地故障 UPS 

分 类 号：TM862[电气工程—高电压与绝缘技术]