GAS-FILLED DISCONNECTING SWITCH OF SULFUR HEXAFLUORIDE HIGH-VOLTAGE METALCLAD SWITCHGEAR Russian patent published in 2001 - IPC

FIELD: electrical engineering. SUBSTANCE: disconnecting switch has cylinder-shaped movable and fixed contacts arranged on common axis and placed in metal case filled with sulfur hexafluoride. Placed inside movable contact on longitudinal axis common for both contacts are liquid resistor, spring braced by flexible tape that functions to connect one end of resistor to short metal cylinder fixed to inner space of movable contact and provided with hole along its axis to pass fixed rod abutting against flexible tape; placed inside fixed contact is spring-loaded rod free to come in contact with second end of resistor. EFFECT: improved reliability of switchgear due to lower amplitude and higher rise time of surge pulse. 3 dwg