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交直流叠加电压作用下油纸绝缘内部气隙放电发展过程

DOI: 10.13334/j.0258-8013.pcsee.2014.36.023, PP. 6554-6561

Keywords: 换流变压器,油纸绝缘内部气隙缺陷,交直流叠加电压,局部放电,发展过程,严重程度

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Abstract:

绝缘气隙的存在会加速换流变压器油纸绝缘的老化,不同于交流变压器,换流变压器内部绝缘长期处于交直流叠加电压的共同作用,放电现象有明显区别。该文搭建了一套交直流叠加电压作用下油纸绝缘局部放电检测试验平台,对油纸绝缘内部气隙放电过程进行长期监测,根据局部放电特征变化规律将局部放电过程归纳为3个阶段,总结了各阶段局部放电的统计特征,与交流电压单独作用时的气隙放电特征进行了对比。研究结果表明:交流与正极性直流电压共同作用下油纸绝缘气隙放电起始于交流负半周期,随着时间的发展,放电相位逐渐变宽,并且正半周期放电从无到有,放电重复率逐渐增加。交直流叠加电压作用下的放电特征与交流单独作用时的放电特征不同,不能简单将交流时的诊断依据应用于交直流叠加电压情况下。

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