核电厂500 kV主变压器局部放电异常分析
郭述志，段琰璞，杨庆学
（国核示范电站有限责任公司，山东 荣成 264300）
摘 要：介绍了某核电厂500 kV 主变压器局部放电量超标情况，通过现场试验、返厂解体检查及试验、生产过程排查，全面地分析了变压器局部放电量超标原因。结果表明：由于变压器长期充氮储存，导致外部潮气进入变压器本体，叠加内部绕组撑条位置纸板受力变形，形成绝缘薄弱点，在试验过程产生局部放电。为避免此类事故的发生，针对核电厂主变压器制造、存储、安装周期长等特点，提出了应对措施。
关键词：主变压器；局部放电；油色谱分析
中图分类号：TM411 文献标识码：B 文章编号：1007-3175(2021)01-0043-04
Analysis on Abnormal Partial Discharge of 500 kV Main
Transformer in Nuclear Power Plant
GUO Shu-zhi, DUAN Yan-pu, YANG Qing-xue
（State Nuclear Power Demonstration Plant Co., Ltd, Rongcheng 264300, China）
Abstract: This paper introduces the situation of partial discharge exceeding the standard of 500 kV main transformer in a nuclear powerplant. Through field test, disassembly inspection, test and production process investigation, the causes of over standard of partial discharge oftransformer are comprehensively analyzed. The results show that: due to the long-term storage of nitrogen in the transformer, the external moistureenters the transformer body, and the paperboard at the position of the internal winding stay bar is deformed under stress, forming an insulationweak point and producing partial discharge during the test. In order to avoid the occurrence of such accidents, the countermeasures are putforward according to the characteristics of long manufacturing, storage and installation period of main transformer in nuclear power plant.
Key words: main transformer; partial discharge; oil chromatogram analysis
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