Gas-insulated medium- or high-voltage electrical apparatus including heptafluoroisobutyronitrile and tetrafluoromethane

The present invention relates to a medium- or high-voltage electrical apparatus which includes a sealed enclosure containing electrical components and a gas mixture providing electrical insulation and/or the extinction of electric arcs that may occur inside said enclosure, the gas mixture including heptafluoroisobutyronitrile and tetrafluoromethane. The sealed enclosure of the electrical apparatus according to the invention can contain electrical components covered with a solid dielectric layer having a variable thickness. 本发明涉及种带有密封外壳的中压或高压电气设备，所述密封外壳中内包含电气部件和用于提供电绝缘和/或用来消除在所述密封外壳中可能产生的电弧的气体混合物。所述气体混合物包含有七氟异丁腈和四氟甲烷。根据本发明的电气设备的密封外壳内包含的电气部件被可变厚度的固态介电层覆盖。