| 摘要 |
1,101,670. Arcing preventing in switches. GENERAL ELECTRIC CO. 27 Sept., 1965 [1 Oct., 1964], No. 41036/65. Heading H1N. [Also in Division H2] An arrangement for protecting a superconducting coil 2 connected in an operating circuit and subject to transition to a state of normal conduction, comprises sensing means for detecting a transition and controlling switching means for disconnecting the coil from the circuit, and voltage-limiting energy transfer means connected across the coil to limit the potential across the coil while removing energy therefrom. The sensing means may comprise a voltage pick-up coil 7 associated with the superconducting coil and controlling the switch 4 through an amplifier and an electronic control device 8. The energy transfer means may comprise an anode controlled thyratron 10 in parallel with a capacitor 11 and in series with a diode 12. When normal conduction occurs, the switch 4 is opened and the capacitor 11 charges to the ignition voltage of the thyratron 10. When the thyratron fires, the voltage across it is reduced to its operating value so reducing and limiting the voltage across the superconducting coil 2. Current from the superconducting coil flows through the thyratron until the energy of the coil has been released. A triac, a silicon-controlled rectifier or other solid state device may be used in place of the thyraton. Reference is also made to the use of ignitrons and voltage dependent resistors. |
