High-speed current limiting circuit breaker
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsShigehiro Yoshida, Kazuhiro Yokouchi, Yuichi Wada, Masao Tomita, Kiyoshi Fukuda
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Abstract
A high-speed current limiting circuit breaker comprises a self-recovery type current limiting element for limiting a fault current, a parallel resistance connected in parallel with the self-recovery type current limiting element and a circuit breaker connected in series with the self-recovery type current limiting element, a fault voltage detector for detecting the voltage generated on the parallel resistance and thereby driving an electromagnetic repulsion coil for breaking the circuit breaker.
Claims10
A high-speed current limiting circuit breaker comprising:
- a self-recovery type current limiting element for limiting a fault current,
- a parallel resistance connected in parallel with said self-recovery type current limiting element,
- a circuit breaker connected in series with said self-recovery type current limiting element,
- a fault current detector for detecting a fault current flowing through said circuit breaker,
- a breaker tripping means for tripping said circuit breaker in response to an output of said fault current detector,
- a fault voltage detector for detecting a fault voltage generated on said parallel resistance,
- a switching element connected with and actuated by said fault voltage detector,
- an electro-magnetic repulsion coil which is connected in series with said switching element and a power source in a manner to be excited when said switching element is actuated, and
- a movable rod for breaking said circuit breaker by tripping a latch in said circuit breaker by electro-magnetic repulsion when said coil is excited;
- wherein said fault voltage detector comprises a voltage divider and a voltage detection pulse generator which detects the voltage generated on the parallel resistance and drives said repulsion coil.
A high-speed current limiting circuit breaker comprising:
- a plurality of series connected self-recovery type current limiting elements for limiting a fault current,
- a different resistance connected in parallel with each of said series connected self-recovery type current limiting elements,
- a circuit breaker connected in series with said self-recovery type current limiting elements,
- a fault current detector for detecting a fault current flowing through said circuit breaker,
- a breaker tripping means for tripping said circuit breaker in response to an output of said fault current detector,
- a fault voltage detector for detecting a fault voltage generated across all said parallel resistances,
- a switching element connected with and actuated by said fault voltage detector,
- an electro-magnetic repulsion coil which is connected in series with said switching element and a power source in a manner to be excited when said switching element is actuated, and
- a movable rod for breaking said circuit breaker by tripping a latch in said circuit breaker by electro-magnetic repulsion when said coil is excited;
- wherein said fault voltage detector comprises a voltage divider and a voltage detection pulse generator which detects the voltage generated across the parallel resistances and drives said repulsion coil.
Dependencies are inferred from the claim text.