Abstract The characteristics of ground total electric field of HVDC transmission lines impacted by temperature and humidity are of significance in line design and environmental protection assessment. In this paper, an experimental setup encompassing wire-plate electrodes is built, and the effects of temperature and humidity on the ground total electric field under HVDC lines are studied under three conditions: constant temperature with variable humidity, constant humidity with variable temperature, and coupling change of temperature and humidity. The experimental results show that when the temperature and humidity increase separately, the ground total electric field increases, and it is of polarity dependence. When the coupling change of temperature and humidity in natural environment is simulated, that is, with the increase of relative humidity and decrease of temperature, the ground total electric field increases when the HVDC line is in positive corona, and it increases first and then decreases when the line is in negative corona. An important inference from the results is that the characteristics of ground total electric field obtained under the conditions that temperature and humidity change separately are not applicable for the analysis of ground total electric field in natural environment where temperature and humidity vary simultaneously.

中文翻译：

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温湿度对高压直流输电线路地面总电场的影响

摘要 直流输电线路地面总电场特性受温湿度影响对线路设计和环境保护评价具有重要意义。本文搭建了包含线板电极的实验装置，研究了恒温变湿、恒湿变温、恒湿变温三种条件下温湿度对高压直流输电线路地面总电场的影响。温度和湿度的耦合变化。实验结果表明，当温度和湿度分别增加时，地面总电场增加，且具有极性依赖性。模拟自然环境中温湿度耦合变化时，即 随着相对湿度的增加和温度的降低，高压直流输电线路正电晕时地面总电场增大，负电晕时先增大后减小。结果的一个重要推论是，在温湿度分别变化的条件下获得的地面总电场特性不适用于温湿度同时变化的自然环境中地面总电场的分析。