Study On Discharge Characteristics Of Flat Model And Air Gap Under Sand Dust Environment

With the rapid development of our power system and the improving of transmission voltage, the reliability power system operation is becoming more and more important. 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.The weather of sand dust is generally divided into floating dust,sand-dust storm. considering the conditions of the laboratory, we design the trial device which simulate the weather and study the effect of sand dust to the breakdown characteristics of air gap and plat plane model by the change of wind speed and the charge of sand dust.The sand storm has changed insulation characteristic of the air. This article study the influence of sand dust to the breakdown characteristics of air gap and plat plane model under frequency voltage. So it is necessary to research the influence of sand dust. The results show the influence degree of sand dust to breakdown voltage and the influence degree of speed to breakdown voltage. The breakdown voltage increases with speed. In a certain range, the breakdown voltage is unrelated with the charge of the sand dust; and the dust particles which settle on the cathode are most responsible for this dust related effects.After the deposition to the plat plane model, the sand dust will change the surface medium characteristics of the plat plane model and influence the process of flashover of the plat plane model. In order to analysis the effect of sand dust deposition to the surface, this article studies the effect of the deposition density and the moisture Content of sand dust to the characteristics of flashover of the plat plane model, the results show the flashover voltage of the flat model changes with the deposition density and the moisture content of sand dust; the deposition of sand dust influence the process of flashover of the plat plane model, when the deposition density of sand dust is small, it will form no sand region. But there is no sand region with the increasing of the deposition density of sand dust. The energy of power supply is used to maintain burning of electric arc and movement of sand particle.