赵琳,邵先军,金涌涛,杨勇,杨智,郑文哲
ZHAO Lin,SHAO Xianjun,JIN Yongtao,YANG Yong,YANG Zhi,ZHENG Wenzhe

• 1:国网浙江省电力有限公司电力科学研究院

摘要(Abstract)：

针对两起特高压电抗器油色谱中C_2H_2含量异常升高的案例，采用局放重症监测装置进行长时监测并成功判断出缺陷类型。案例1重症监测结果显示，电抗器内部存在悬浮电位及微弱绝缘类缺陷导致的局部放电，造成C_2H_2含量快速增长。案例2重症监测结果表明，电抗器内部间歇性局放信号为靠近高抗北侧的外部干扰信号，内部无明显放电信号，经铁心夹件接地电流测试，内部缺陷类型为磁路多点接地造成的高温过热产气，色谱增长与局部放电无关。返厂解体发现：案例1电抗器器身1上夹件所连地屏等电位铜带存在断裂放电痕迹以及绝缘纸板破损现象；案例2电抗器器身1上铁轭和上部器身磁屏蔽搭接，接触面存在明显烧蚀，而内部无明显放电痕迹，排除了内部发生放电的可能。解体结果均与局放重症监测的分析结论相吻合，验证了局放重症监测方法在电力设备缺陷分析诊断中的有效性，并可避免受外部信号干扰而发生误判。
Two cases of abnormal acetylene content rise in the oil chromatogram of ultra-high voltage reactors are introduced in this paper. To monitor the internal condition of the reactor in real time and judge the type of defect,a partial discharge critical monitoring device is used for long-term monitoring. Critical monitoring results in case 1 show that there is a partial discharge caused by floating potential and weak insulation defects inside the reactor that lead to the rapid content rise of acetylene. Critical monitoring results in case 2 show that the intermittent partial discharge signal inside the reactor is an external interference signal near the north side of the ultra-high voltage reactors,and there is no obvious internal discharge signal. As to the iron core clamp ground current test,the internal defect type is the high temperature and overheating gas produced by the multi-point grounding of the magnetic circuit,and the chromatogram growth has nothing to do with the partial discharge. It is discovered by disassembly that the equipotential copper tape of the ground screen connected to the clamp on reactor body 1 in case 1 has broken discharge traces and the insulation paperboard is damaged. In case 2,the iron yoke of reactor body 1 and the magnetic shield of the upper body are overlapped,and the contact surface is obviously ablated with no obvious discharge trace inside,which excludes the possibility of internal discharge. The disassembly results are consistent with the analysis conclusions of the partial discharge critical monitoring system,verifying the effectiveness of the partial discharge critical monitoring method in power equipment defect analysis. The method can evade misjudgment due to external signal interference.

关键词(KeyWords)： 特高压;电抗器;局放重症监测;放电识别;干扰排除
UHV;reactor;PD critical monitoring;discharge recognition;interference elimination

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司科技项目（5500-202019093A-0-0-00）

作者(Author): 赵琳,邵先军,金涌涛,杨勇,杨智,郑文哲
ZHAO Lin,SHAO Xianjun,JIN Yongtao,YANG Yong,YANG Zhi,ZHENG Wenzhe

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