测试点偏移时的接地网腐蚀故障诊断方法

Grounding grid corrosion diagnosis with offset test point

为减小测试点偏移对接地网腐蚀故障诊断结果造成的影响,利用PSCAD模拟偏移状况,对2种偏移程度下的完全可测支路故障诊断结果进行对比分析,基于分析结果提出一种测试点在不同偏移程度下的归算处理方法。根据该方法对原有非线性故障诊断数学模型及混合粒子群优化算法进行改进,仿真结果表明改进的接地网腐蚀诊断算法在测试点偏移情况下仍然准确有效。

Two levels of test point offset are simulated in PSCAD for the fully-measurable branch and their fault diagnosis results are compared to analyze the influence of test point offset on the corrosion diagnosis of grounding grid,based on which,a reducing method is proposed for different levels of test point offset. According to the proposed method,the mathematical model of non- linear fault diagnosis and the hybrid particle swarm algorithm are improved. The simulative results show that the improved grounding grid corrosion diagnosis algorithm is correct and effective in the condition of offset test point.