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油浸绝缘纸损伤与局部放电相位分布模式演化的关系

, PP. 199-207

Keywords: 局部放电,油浸绝缘纸,损伤,相位分布,演化

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Abstract:

文章对油浸绝缘纸损伤过程中的表面形貌、表面粗糙度、表面电导率和气隙气体与局部放电相位分布(PRPD)模式演化的关系进行了研究。根据PRPD模式变化将放电损伤过程划分为五个阶段,利用显微镜、扫描电镜、原子力显微镜、高阻仪和气体测量装置,对比分析了每一阶段的表面损伤情况及气隙气体变化。研究结果表明五个损伤阶段中,电负性气体含量交替下降上升,气隙内的主要放电形式在亚辉光(或辉光)放电和脉冲放电之间交替转换;亚辉光放电的PRPD模式主要由生成的弱电负性气体自身性质决定;脉冲放电的PRPD模式主要由表面损伤决定;脉冲放电的PRPD模式均拥有不同程度的“兔耳”特征和周期特征,“兔耳”特征强弱主要由表面电导率决定,周期特征强弱主要由表面陷阱密度决定;表面粗糙度不改变PRPD模式形状,但随着其值下降放电量呈上升趋势。

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