基于统计学模型的真空绝缘堆闪络概率计算分析

摘要

The statistical model is used as a typical method for vacuum insulator stack flashover probability calculation.We have calculated the stack flashover probability and the g factors by which a flashover willchange the voltages on the each of the in-sulator rings with different conditions.The calculated results show that the real performance of insulator stack characteristics with the multi-stage and large circumferential transit time.The matrix a in the statistical model was predigested to reduce the g calcu-lation time and make the probability calculation accurate.Finally,analysis based on fixed distance between insulation rings showed that there were some optimized ring numbers with maximum voltage amplitude and electrical field amplitude.This con-clusion could be used for evaluation of insulation ring number in insulator stack design.%对比了几种不同类型的过电压因子下绝缘堆闪络概率的特点,考虑了多层均压及圆周渡越时间后得到的闪络概率更能反映绝缘堆耐压水平;简化计算统计学经验公式中矩阵可保持绝缘堆闪络概率计算值准确性并减少过电压因子的静电场计算次数.分析在固定间隙距离下绝缘环个数与电压峰值及电场强度峰值的关系,计算结果表明:存在最优绝缘环个数承受最高电压峰值与电场强度,承受最大工作场强的绝缘环个数下,工作电压幅值已降低很多.在选择绝缘环个数时应综合考虑,该计算方法可应用于工程绝缘结构设计中合理选取绝缘环个数.