220kV母线CVT开口三角电压异常定位分析  

Analysis of Abnormal CVT Open Delta Voltage Location of 220 kV Bus

作　　者：金庆忍 郭敏 陈卫东 楚红波 

机构地区：[1]广西电网有限责任公司电力科学研究院,南宁530023

出　　处：《广西电力》2016年第5期12-15,共4页Guangxi Electric Power

基　　金：南方电网公司科技项目(GXKJXM20151005)

摘　　要：分析某220 kVⅠ母CVT开口三角电压异常的原因。通过开展绝缘电阻和介损测试、电能质量测试以及各种录波测试,逐步排除CVT本体故障、电气化铁路影响、同变电站其它CVT或系统内存在异常信号等因素,最终确定异常尖峰扰动来自220 kVⅠ母B相CVT。解体检查发现,B相CVT内部避雷器间歇放电是造成开口三角电压异常的原因。拆除该避雷器后再次对该CVT进行加压试验,开口三角电压恢复正常。所采用的定位分析方法为CVT的检修与消缺提供了参考依据。Reasons of abnormal CVT open delta voltage in a 220 kV I bus are analyzed. By doing tests including insulation resistance and dielectric loss test, power quality test and every kind of recording tests, factors are excluded including fault of CVT body, influence of electrified railway and abnormal signals existed in other CVTs of the same substation or in the system. Finally it is determined that the abnormal peak disturbance is from the B phase CVT of 220 kv I bus. It is found by disassemble inspection that the intermittent discharge of arrester inside the B phase CVT is the reason of abnormal open delta voltage. After removing the arrester of the CVT the increasing voltage test is done again, and the open delta voltage gets back to normal. The adopted location analysis method provides reference basis for the maintenance and defects elimination of CVT.

关 键 词：CVT 开口三角电压 电压异常 录波试验 

分 类 号：TM451.2[电气工程—电器] TM77