沙尘对电力系统外绝缘电气特性影响分析

为了解沙尘对电力系统运行造成的影响,在查阅有关文献的基础上分析了沙尘对空气间隙和绝缘子放电特性的影响,同时在沙尘模拟实验室进行了风沙对间隙击穿电压影响的实验研究。分析和研究表明:在雷电冲击和操作冲击电压作用下,沙尘对空气间隙的冲击放电特性有一定的影响,主要是由于阴极表面上的沙尘引起;沙尘对空气间隙及绝缘子放电特性的影响程度与风速、沙尘的带电量等因素有关。

Effect of Sand Dust Environment on External Insulation of Electrical Power System

The sand storm is one kind of serious natural disaster. In recent years, along with the frequent appearance of sand dust weather in our country, the influence of sand dust on electrical discharge of outdoor insulation causes our attention. There are also some reports on the power system tripped-out accidents caused by blowing sand in China. Therefore, researches on the influence of wind-sand on the electrical discharge characteristics along the insulator and air gap are important for the outdoor insulation coordination and safe operation of power system. This paper carries on the summary about the influence of sand dust on the breakdown of air gap and the flashover characteristics of the insulator on the present stage. Moreover, the tests on the influence of wind-sand on the air gap breakdown voltage are carried out in the wind-sand simulation laboratory. The results show that the sand dust particles had a considerable influence on the breakdown of air gaps under lightning and switching impulses, and the dust particles which settle on the cathode are most responsible for this dust related effects. The influence of the samd dust particles on the breakdown voltage of the air gap and the flashover characteristics of the insulator is dependent upon wind speed and the electric quantity of sand dust and so on.