亲水性时绝缘子交流污闪模型的影响因素

Influencing Factors of AC Pollution Flashover Model of Hydrophilic Insulator

为了研究亲水性时不同因素对绝缘子交流污闪电压的影响,在分别使用考虑弧根半径影响和不考虑弧根半径影响的剩余污层电阻计算公式的基础上,用Obenaus模型计算污闪电压,然后用人工污秽试验结果验证了该模型的有效性。基于该模型分析了亲水性情况下爬电距离、附盐密度、等效直径、电弧参数、空气中弧长和电弧恢复条件对模型所得交流污闪电压的影响。结果表明:随着等效直径的增加污闪电压呈幂函数下降;随着电弧参数A的增加,污闪电压呈幂函数增大;随着电弧参数n的增加,污闪电压呈线性规律下降,但下降程度很少;随着空气中弧长比例的增加,污闪电压线性下降,但下降程度很少;弧飘使等效泄漏增加时污闪电压随爬电距离而呈近似线性增大,否则呈近似线性减少;电弧恢复条件对模型算得污闪电压有明显影响,从计算结果上看公式U=1050 X/I具有最高的准确性。

To research the influences of various reasons on the alternating current （AC） pollution flashover voltage of hydrophilic insulator, calculation formulas for residual pollution layer resistance in consideration of arc root radius or neglecting of arc root radius were used, and the Obenaus model was used to calculate the pollution flashover voltage. Moreover, the effectiveness of the model was confirmed by the experimental results of artificial pollution. Mean while, the influences of the creepage distance, salt deposit density （SDD）, equivalent diameter, arc parameter, air arc length and arc restoration condition on the AC pollution flashover voltage of hydrophilic insulator were studied. The results indicate that： the pollution flashover voltage will decrease with the increase of equivalent diameter as power function; the pollution flashover voltage will increase with the increase of the arc parameter A as power func- tion; the pollution flashover voltage will linearly decrease with the increase of the arc parameter n, but the changed value is very small; the pollution flashover voltage will linearly decrease with the increase of the air arc length, but the changed value is very small; if the arc floating makes equivalent creepage distance longer, the pollution flashover voltage will nearly linear increase with the creepage distance, otherwise the pollution flashover voltage will nearly linearly decrease with the creepage distance; the arc restoration condition has an obvious influence on the pollution flashover voltage calculated by the Obenaus model. U= 1050X/I is accurate according to the calculation result of the paper.