交流电场对覆冰水冻结过程中导电离子迁移的影响

Influence of AC Field on Conductive Ion Migration During the Freezing Process of Freezing Water

鉴于冰层电导率分布对于绝缘子闪络的重要性,文中着重从以下方面进行研究：电场对水滴冻结过程的影响、电场强度对导电离子迁移的影响。通过对带电覆冰绝缘子冰层融冰水电导率的测量,进而分析讨论绝缘子表面冰层和冰棱中电导率的空间分布。结果表明：水滴的平均冻结时间跟电场强度有关系。电场强度越大,覆冰水冻结过程中导电离子迁移程度越小。绝缘子表面冰层融冰水电导率与融冰时间成非线性递减关系。绝缘子在串中的悬挂位置对其冰层最大融冰水电导率有明显影响。带电覆冰条件下,冰层和冰棱的最大融冰水电导率要低于不带电覆冰条件下的对应值。综上所述,交流电场对覆冰水中导电离子迁移的影响较为明显。因此,该研究为进一步完善绝缘子覆冰闪络模型提供参考。

The conductivity distribution in ice layer is crucial to ice flashover voltage of insulator.Consequently, we studied the effects of AC field water on droplet freezing and the effects of electric field strength on conductive ion migration.The measurement results of the conductivity of melting ice water can be used for analyzing and discussing the spatial distribution of conductivity in ice layer and icicles of insulator. Results show that the average freezing time of water droplets is related to the electric field strength. The extent of conductive ion migration decreases with the increasing of electric field strength. The melting water conductivity of ice layer nonlinearly decreases with the melting time. Hanging location in insulator string significantly affects the melting water conductivity of the ice layer. The maximal melting water conductivity of the ice layer and icicles of the insulator under energized condition is lower than that under the non-energized condition. In summary, the influence of AC field on conductive ion migration is evident. Therefore, this study may serve as a reference when further improving the ice flashover model of insulators.