SYSTEM FOR SUPPLYING ENERGY TO A DEVICE AT HIGH POTENTIAL

摘要

1325070 High voltage switches ALLMANNA SVENSKA ELEKTRISKA AB 18 Dec 1970 [19 Dec 1969] 60142/70 Heading H1N [Also in Division H2] A system for supplying energy to a device 3 located at the potential of a H.V. line 1 with which it is operatively associated, comprises means 12 for supplying energy from the current in the line when sufficient current is flowing, a generator 13 located at line potential and supplied with driving power from a source at earth potential, and a control system to start the generator when the line is disconnected or is carrying insufficient current. The energy may be used for the control of a circuit-breaker 2, e.g. a gas-blast circuit-breaker having a blast valve 3 with an electrodynamic operating device having a coil 4 which is energized by the discharge of a capacitor 6 when a thyristor 5 is triggered by a tripping signal. This signal is transmitted from a conductor 10 dy a light pulse device 7, a light conductor 8 anb photodetector 9. The capacitor is charged from a device 11 which is normally supplied from a shunt or current transformer 12. Should the voltage across the capacitor 6 fall or should contacts 18 be opened on the opening of the circuit-breaker, a sensing device 17 energizes a light source 19 to transmit a light signal to a photo-detector 21 to effect the closing of a contactor 22. This energizes an electric motor 16 which drives an hydraulic pump 15 to supply an hydraulic motor 14 to drive the generator 13. In an alternative arrangement, Fig. 2 (not shown), the motor 16 drives the generator 13 through an insulating rod.