Gaoya dianqi, 2012 介绍了一起由低压开关柜内部短路引起的220 kV变压器绕组损坏事故。为检查绕组损坏程度,进行了绕组电阻测试、油中溶解气体分析和扫频响应等试验,通过对试验数据分析得出变压器内部低压侧绕组发生严重变形且低压C相绕组存有断点,返厂解体结果验证了分析结论的正确性,最后对事故发生的原因进行了深入分析,并提出了采用半硬自粘换位导线等防范措施。
高树国 +4 more
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Gaoya dianqi, 2019 在利用油色谱数据对电力变压器进行故障诊断时,为了改善因油色谱数据的波动及其非线性所带来的干扰,文中在利用油色谱分析过热故障时,引入了混沌理论对非线性系统进行分析。文中通过相空间重构建立油色谱数据混沌时间序列,并进行系统混沌特性判定,再将油色谱数据的波动以混沌特征量进行表征,比较分析过热故障特征气体在不同监测数据段中的混沌特征参量变化,从而提取油色谱非线性数据中所包含的状态信息。然后,基于混沌序列具有的短期预测性,利用最大Lyapunov指数预测法对油中气体体积分数的趋势进行预测。实例分析结果表明 ...
张鹏飞, 周力行, 张倬栋, 黎佳
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