间插大伞片对绝缘子局部电场分布的影响

为了探求大伞片的插入对绝缘子覆冰闪络电压的影响,以110 k V复合绝缘子为计算模型,以实际运行时的绝缘子覆冰形态为研究对象,通过对二维电场Laplace方程进行求解,分析了在不同覆冰情况下,间插大伞片数量和结构对端部电场强度的影响,得到间插不同大伞片电场的最优解.计算结果表明:无覆冰条件下,大伞片的插入对绝缘子电位分布几乎没有影响;覆冰条件下,绝缘子中均匀插入三片或四片大伞片,可提高冰闪电压,提高绝缘子串的绝缘性能.

Effect of insertion of large sheds on local electric field distribution of insulator

In order to explore the effect of the insertion of large sheds on the icing flashover voltage of insulator, the effect of both number and stucture of inserted large sheds on the terminal electric field was analyzed under different icing conditions through taking the 110 kV composite insulator as the calculation model, regarding the icing morphology of insulator form in actual running as the research object and performing the solution for Laplace equation in 2D electric field. In addition, the optimal solution of electric field inserted with different large sheds was obtained. The calculated results show that under no icing condition, the insertion of large sheds has little effect on the potential distribution of insulator. Under the icing condition, the uniform insertion of three or four large sheds in the insulator can improve the icing flashover voltage and enhance the insulation properties of insulator string.