机车车辆用绝缘子均压环形式对绝缘性能影响研究

Study on the influence of locomotive insulator equalization ring form on insulation performance

由于高压隔离开关金具处电场分布不均匀,电晕放电起始电压较低,进而导致整体的耐压性能降低。均压环是改善复合绝缘子电场分布直接而有效的方式,不同的均压环形式会对耐压性能和电晕放电起始电压有影响。通过有限元仿真计算不同形式的均压环对绝缘子电场强度的改善效果,并通过试验验证确定最终方案。

Due to the uneven electric field distribution at the high-voltage isolating switch fittings,the corona discharge starting voltage is low,leading to a decrease in the overall withstand voltage performance.Utilizing a grading ring is a direct and effective way to improve the electric field distribution of composite insulators.Different forms of grading ring will have different impacts on withstand voltage performance and corona discharge starting voltage.In this paper,the effect of different forms of grading rings on the electric field strength of insulators is calculated by finite element simulation,and the final scheme is determined by experimental verification.