一起高压套管更换末屏引出装置后介质损耗因数异常分析
|
摘要
套管作为变压器的重要组件,其绝缘状况的优劣直接影响着变压器的安全稳定运行,套管介质损耗因数tanδ和电容量Cx能够有效反映设备绝缘的整体老化、受潮、内部集中性缺陷等一系列问题。针对一起220 kV变压器高压侧套管介质损耗因数异常增大的特殊案例,经现场缺陷排查发现,该现象是由于更换套管末屏引出装置时外部气体侵入套管内部绝缘油中形成气泡所引起的,并通过现场模拟和理论分析对此进行了验证,同时对如何预防此类缺陷提出了相关建议。
As one of the key components in power transformer, the insulation condition of the transformer bushing directly affect the healthy and stable operation of the power transformer. A series of problems such as the overall aging, moisture, and internal concentration defects of the equipment insulation can be effectively reflected through the test of the dielectric loss factor tanδ and the capacitance Cx. This paper introduces a special case about the abnormal increase of dielectric loss of HV side bushings in a 220 kV transformer. The investigation of the cause indicates that it is caused by gas intrusion into the bushings insulation oil while changing the bushing tap extraction device, and it is verified by on-site simulation and theoretical analysis.Suggestions are put forward on how to prevent such defects.
As one of the key components in power transformer, the insulation condition of the transformer bushing directly affect the healthy and stable operation of the power transformer. A series of problems such as the overall aging, moisture, and internal concentration defects of the equipment insulation can be effectively reflected through the test of the dielectric loss factor tanδ and the capacitance Cx. This paper introduces a special case about the abnormal increase of dielectric loss of HV side bushings in a 220 kV transformer. The investigation of the cause indicates that it is caused by gas intrusion into the bushings insulation oil while changing the bushing tap extraction device, and it is verified by on-site simulation and theoretical analysis.Suggestions are put forward on how to prevent such defects.
引文
[1]秦少瑞,丁国成,李坚林,等.一起导电管断裂引起的变压器高压套管故障分析[J].变压器,2018,55(5):81-84.
[2]俎洋辉,郑强,李新雷,等.500 kV豫北变电站1号主变压器C相高压放电事故分析[J].河南电力,2011(1):21-24.
[3]罗汉生.电力变压器高压进出线套管多发事故原因浅析[J].广东电力,1999,12(2):15-17.
[4]柯钜金,尹项根,雷蓉,等.某大型变压器高压套管爆炸的原因分析及防范措施[J].广东电力,2002,15(6):58-60.
[5]陈化刚.电力设备预防性试验方法及诊断技术[M].北京:中国水利水电出版社,2009.
[6]输变电设备状态检修试验规程:Q/GDW 1168-2013[S].北京:中国电力出版社,2013.
[7]吴冬文,胡道明.变压器高压套管介损现场试验的分析与探讨[J].江西电力,2011,35(4):5-7.
[8]张文峰,林春耀,孙文星,等.油纸电容式变压器套管电容心受潮的检测原理与试验研究[J].高压电器,2018,54(1):137-142.
[9]夏健,丁卫东,孙旭东,等.基于数据分析的变压器套管新型在线监测预警策略研究[J].高压电器,2018,54(9):171-176.
[10]张鹏,侯睿,翟国柱,等.对主变压器套管介质损耗因数偏大故障现有理论解释的讨论[J].变压器,2016,53(8):66-72.
[11]叶会生,周文胜,刘兴文,等.两起变压器套管介质损耗因数数据异常分析及处理[J].变压器,2012,49(4):126-128.
[12]王军德,董万光,侯宪法.110 kV主变压器套管介质损耗因数超标的分析与处理[J].变压器,2012,49(3):67-68.
[13]王平.某燃气电厂主变压器压器套管介质损耗因数超标的故障处理[J].燃气轮机技术,2017,30(1):57-60.
[14]程扬军,黄堃,庄伟.由测量回路接触不良引起介质损耗因数偏大的分析[J].电力电容器与无功补偿,2014,35(2):78-81.
[15]李峰,孙旭东,王红斌,等.考虑气象环境影响的变压器套管介损监测预警策略[J].高压电器,2017,53(7):159-166.
[16]毛娟,邓威.110 kV变压器油纸电容式套管介质损耗因数异常分析[J].电世界,2017(3):132-133.
[17]唐炬,朱黎明,麻守孝,等.绝缘油中悬移气泡局部放电特性[J].高电压技术,2010,36(6):1341-1346.
[2]俎洋辉,郑强,李新雷,等.500 kV豫北变电站1号主变压器C相高压放电事故分析[J].河南电力,2011(1):21-24.
[3]罗汉生.电力变压器高压进出线套管多发事故原因浅析[J].广东电力,1999,12(2):15-17.
[4]柯钜金,尹项根,雷蓉,等.某大型变压器高压套管爆炸的原因分析及防范措施[J].广东电力,2002,15(6):58-60.
[5]陈化刚.电力设备预防性试验方法及诊断技术[M].北京:中国水利水电出版社,2009.
[6]输变电设备状态检修试验规程:Q/GDW 1168-2013[S].北京:中国电力出版社,2013.
[7]吴冬文,胡道明.变压器高压套管介损现场试验的分析与探讨[J].江西电力,2011,35(4):5-7.
[8]张文峰,林春耀,孙文星,等.油纸电容式变压器套管电容心受潮的检测原理与试验研究[J].高压电器,2018,54(1):137-142.
[9]夏健,丁卫东,孙旭东,等.基于数据分析的变压器套管新型在线监测预警策略研究[J].高压电器,2018,54(9):171-176.
[10]张鹏,侯睿,翟国柱,等.对主变压器套管介质损耗因数偏大故障现有理论解释的讨论[J].变压器,2016,53(8):66-72.
[11]叶会生,周文胜,刘兴文,等.两起变压器套管介质损耗因数数据异常分析及处理[J].变压器,2012,49(4):126-128.
[12]王军德,董万光,侯宪法.110 kV主变压器套管介质损耗因数超标的分析与处理[J].变压器,2012,49(3):67-68.
[13]王平.某燃气电厂主变压器压器套管介质损耗因数超标的故障处理[J].燃气轮机技术,2017,30(1):57-60.
[14]程扬军,黄堃,庄伟.由测量回路接触不良引起介质损耗因数偏大的分析[J].电力电容器与无功补偿,2014,35(2):78-81.
[15]李峰,孙旭东,王红斌,等.考虑气象环境影响的变压器套管介损监测预警策略[J].高压电器,2017,53(7):159-166.
[16]毛娟,邓威.110 kV变压器油纸电容式套管介质损耗因数异常分析[J].电世界,2017(3):132-133.
[17]唐炬,朱黎明,麻守孝,等.绝缘油中悬移气泡局部放电特性[J].高电压技术,2010,36(6):1341-1346.