EN
上一条： 
沪公网安备31011802003762
-
-
Tel:13585763546 -
扫码咨询
-
-
TOP
韦弗斯新闻动态
最新动态
SF6安全保障专家
专注于SF6气体检测的专业化
What are the main factors affecting SF6 gas breakdown voltage?
发布时间：2015-01-11
来源：ydlcb 浏览次数：39次
After analysis, Dr. Weavers concluded that the main factors affecting SF6 gas breakdown voltage are SF6 electric field uniformity, SF6 gas gap, SF6 gas pressure, SF6 gas electrode surface state.
The factors that affect SF6 gas breakdown voltage are as follows:
(1) Uniformity of electric field. The breakdown voltage of SF6 varies greatly in different uniform electric fields. In a uniform electric field, the breakdown voltage of SF6 is larger than that in a highly non-uniform electric field, and this effect is much greater than that of air.
(2) SF6 working pressure. Increasing the working pressure of SF6 is one of the ways to increase the breakdown voltage of SF6, but the working pressure should not be too high, otherwise SF6 will liquefy. At the same time, it should be noted that the breakdown voltage of SF6 tends to be saturated with the increase of air pressure, and the more uneven the electric field, the easier it is to saturate. Therefore, it is only effective to increase SF6 working pressure under the condition that SF6 is liquefied and the electric field is fairly uniform.
(3) SF6 gas is an impurity. When the SF6 is mixed with air, nitrogen and other impure gases or conductive particles, its insulation capacity can be significantly reduced. The conductive particles of SF6 gas move under the action of electric field, and gradually form a "conductive bridge", resulting in a decrease in breakdown voltage.
(4) Electrode surface. The breakdown voltage of SF6 decreases with the increase of electrode surface area. The rougher the electrode surface, the lower the breakdown voltage. After multiple discharge treatment, the electrode surface is smooth, and the breakdown voltage has a tendency to increase.