Control means for pneumatically operated high voltage switching device

Claim 1

A control device for a pneumatically operated high voltage switching device, said control device comprising an operating mechanism (1) activated by compressed gas, at least one compressed gas valve (5 or 6) separated from current-carrying parts of said switching device, said valve comprising a valve housing having an inlet opening (7) for compressed gas and a valve member (30) movable in said valve housing, said movable valve member being shaped substantially as a sheath having an axial through-channel (31), said through-channel permanently communicating with said operating mechanism (1), said valve housing including two valve seats (32,33), said valve member being axially displaceable between said two valve seats, said seats cooperating with both ends of said sheath, a sealing ring (34) arranged around the central part of said sheath, said sheath being slidable in said sealing ring, said valve housing having a second opening to the open air, said sheath including means for selectively closing said two valve openings (7,9), said operating mechanism including an inlet for compressed gas connected to said compressed gas valve housing, an electrodynamic operating means (36,37) in said valve housing for operating said valve member, said operating means comprising at least one stationary coil (37), said movable valve member including short-circuit means (36) movable therewith and inductively connected to said coil, an energy accumulator (13,14) at high potential, and means for connecting said coil to said energy accumulator.