局部放电的静电场仿真定量分析

Quantitative analysis of static electric field simulation about partial discharge

在指导电气产品的绝缘设计方面,电场仿真分析的应用日益广泛。以局部放电测试工装为研究对象,分析静电场仿真数据与局部放电起始电压之间的量化关系,提出采用静电场仿真数据预测局部放电起始电压的方法,并通过试验验证了该方法的可行性。研究表明,仿真数据中的最大电场强度、最大场强位置周边区域的电场不均匀系数与局部放电起始电压息息相关。对某工况下的局部放电起始电压进行预测,结果表明预测方法适用于稍不均匀电场的结构,试验测得的局部放电起始电压与预测电压的误差不超过10%。

In the aspect of guiding the insulation design of electrical products,the application of electric field simulation analysis is increasingly widespread.Taking the partial discharge test tooling as the research object,the quantitative relationship between the static electric field simulation data and the partial discharge inception voltage is studied,the method of predicting the partial discharge inception voltage using the static electric field simulation data is proposed,and the feasibility of this method is verified by experiments.The research shows that the maximum electric field strength and the electric field non-uniformity coefficient in the simulation data are closely related to the partial discharge inception voltage.The partial discharge inception voltage under a certain working condition is predicted,and the results show that the prediction method is applicable to the structure which has a slightly uneven electrical field.The error between the partial discharge inception voltage measured in the test and the predicted voltage is not more than 10%.