SULPHUR HEXAFLUORIDE SWITCH Russian patent published in 1994 - IPC

FIELD: electrical engineering. SUBSTANCE: sulphur hexafluoride switch has movable contact 2 and fixed contact 3 arranged in metal housing 1 which are secured on support insulators 4 whose end faces have metal screens 5 connected to flanges 6 of housing 1 by studs. Screens 5 and studs are insulated from flange 6 by means of bushings and washers. Studs are electrically interconnected and at least one of them has conductor 10 connected to terminal 11 of through insulator 12 installed on metal housing 1. EFFECT: possibility to check quality of insulation of support insulators of sulphur hexafluoride switches by measuring partial discharges using electric test method and (or) to check voltage in main current-carrying circuit of switch in service. 2 dwg