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复合电场下油纸(板)绝缘击穿特性及其数学模型

, PP. 170-176

Keywords: 换流变压器,油纸绝缘,复合电场,击穿特性,电场仿真,数学模型

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Abstract:

为研究油纸复合绝缘在复合电场下的击穿特性,以典型油–纸绝缘结构为主要研究对象,首先通过试验方法得到了典型油–纸绝缘在复合电场下的击穿特性;又根据等效电路模型得到仿真边界条件,对变压器油和绝缘纸板中的电场分布进行了仿真分析;然后,分别对变压器油和浸油纸板的击穿特性进行了测试。根据两种介质中电场的数学表达式,得到了电场E和交流百分含量h之间的关系,并将其电场分布图像与油、纸板的击穿场强进行了比对和分析,总结出油纸复合绝缘击穿电压随交流含量变化的数学表达式。据此,提出随交流含量变化两种介质中的电场强度改变和各自介电强度的差别是导致整体击穿电压呈现先升后降趋势的主要原因。

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