Abstract
According to operational experience of power systems, the outdoor insulation strength can be reduced due to the effect of rain. Till now, little work has been done to investigate the flashover performance of air gapped arresters under rain conditions. Therefore, in this paper, experiments were carried out and the AC flashover performance of 10 kV arresters with different air gap structures was studied. The experimental results show that, for the tested arresters, the flashover current mainly flows through the air gaps and zinc oxide varistors under rain conditions. It is also confirmed that the flashover voltages decrease with the increasing of rain intensity and conductivity. In the windward direction, the wind can distort the water streams between the air gaps and rise the flashover voltages. In the leeward direction, if the rod electrode is beyond the range of the plane electrode, the flashover voltage researches the smallest value when the wind speed is 4 m/s. Analysis and discussions have been done to explain the experimental results, and the research in this paper may provide reference to improve the flashover performance of air gapped arresters under rain conditions.
Highlights
With the fast development of power systems in China, some new problems have been found, and one of them is heavy rain
The structure of the air According to the existing studies, the breakdown and flashover performance of air gaps and gapped arresters is more complicate than air gaps and insulators, which have air gaps, silicon rubber insulators under rain conditions have been studied by scholars
3, from can relationship be known that, with flashover voltage conductivity shown in voltage
Summary
With the fast development of power systems in China, some new problems have been found, and one of them is heavy rain. The results show that, rational shedsperformance structure can improve the and According to the existing the breakdown and flashover of air gaps flashover voltage of insulators under rain conditions. The structure of the air According to the existing studies, the breakdown and flashover performance of air gaps and gapped arresters is more complicate than air gaps and insulators, which have air gaps, silicon rubber insulators under rain conditions have been studied by scholars. The effects rain intensity, rain conductivity, air gapped arresters have been carried out in this paper. Studies The in this paper thehelp improvement been made explain the experimental studies in can this give paperhelp can to give to the of insulation performance of air gapped arresters under rain conditions. This paper is organized improvement of insulation performance of air gapped arresters under rain conditions.
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