SF6 gas insulation has been used to miniaturize switchgear widely in 40.5kV rate .With the demand of environmental protection, solid insulation has been regarded increasingly .

• 目前，40.；5kV电压等级广泛应用SF6气体绝缘实现产品的小型化，出于环保要求，固体绝缘技术的应用受到越来越多的关注。