一起±800 kV换流变压器油中溶解气体异常原因分析  

Cause analysis of a chromatographic data anomaly of±800 kV transformer

作　　者：陈巳阳 王来源 周秀 CHEN Siyang;WANG Laiyuan;ZHOU Xiu(Maintenance Company of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750011,China)

机构地区：[1]国网宁夏电力有限公司检修公司,宁夏银川750011

出　　处：《宁夏电力》2021年第6期57-61,共5页Ningxia Electric Power

摘　　要：针对一起某±800 kV换流站极Ⅱ低端Y/Y-A相换流变压器总烃超标现象,以油中溶解气体三比值、产气速率等方法为基础,结合该换流变压器油中溶解气体数据异常的运行工况进行综合分析,通过分析该换流变压器负荷、油温、分接开关动作、铁心及夹件接地电流变化趋势与油中溶解气体数据变化趋势相关性,确定该换流变压器内部故障范围。该分析方法能够缩小变压器内部过热故障范围,提升故障判断准确度。Total hydrocarbons in converter transformer in phase A at low-end Y/Y-A on pole-Ⅱin a±800 kV converter station exceeded the provided standard.Based on oil chromatographic data change trend and oil chromatographic data of typical analysis,the paper,in combination with various operating conditions since the oil chromatographic data anomaly,analyzes the correlation of the changing trend of load,oil temperature,tap changer action,and iron core and clamper grounding current and oil chromatographic data change trend.According to the results of correlation analysis,the internal fault range of the converter transformer can be determined.The analysis method can reduce the fault range of transformer internal overheat and improve the accuracy of fault judgment.

关 键 词：换流变压器 运行工况 油中溶解气体 相关性 

分 类 号：TM726[电气工程—电力系统及自动化]