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SF6安全保障专家
专注于SF6气体检测的专业化
What are the insulation properties and strength of sulfur hexafluoride gas?
发布时间：2020-08-17
来源：ydlcb 浏览次数：26次
SF6 gas insulation strength is affected by the following factors:
(1) Influence of electric field uniformity. Under a uniform electric field, the insulation strength increases linearly with the increase of the distance between contacts. When the distance is too large, the insulation strength increases and saturation occurs due to the uneven electric field. Under uneven electric field, its insulation strength will even approach the level of air.
(2) The relationship with pressure, under a more uniform electric field, the insulation strength increases with the increase of gas pressure, but it is affected by the thickness of the container wall and the volume of the internal components of the equipment. You can't raise the gas pressure too high. Generally, at 20℃, the pressure of SF6 gas chamber is 0.3-0.6mpa, and the pressure of SF6 arc extinguishing chamber is 0.5-0.7mpa.
(3) The influence of electrode surface state. Generally, the rougher the electrode surface, the lower the breakdown voltage. The larger the electrode area, the greater the probability of accidental factors, thus reducing the breakdown voltage.
(4) The influence of voltage polarity, because the insulation structure of the SF6 circuit breaker is a slightly uneven electric field form, its insulation level is often determined by the complex polarity voltage.