Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Plural magnets or flux sources
Patent
1993-04-02
1995-01-03
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Plural magnets or flux sources
335183, H01H 900
Patent
active
053790146
ABSTRACT:
A vacuum circuit breaker comprising an external coil which is arranged outside a vacuum interrupter, and a power supply circuit which causes current to flow through the external coil. An overcurrent flowing through the main circuit of the circuit breaker, which leads to a load, is detected by an overcurrent tripping device so as to separate the movable electrode of the vacuum interrupter from the fixed electrode thereof and to subject a striking electric arc to a magnetic flux generated axially of the vacuum interrupter by the electrodes themselves. Thereafter, a trigger gap is ignited by a signal delivered from the overcurrent tripping device, so as to introduce a reverse current into the vacuum interrupter. Herein, the trigger gap is ignited by a signal delivered from the overcurrent tripping device, in order that the zero point of currents may be formed at the point of time at which the axial magnetic flux has been canceled by the resulting current of the external coil. Since the axial magnetic flux remaining at the zero point of the currents is nullified, charged particles are not hindered from diffusing radially of the vacuum interrupter, and hence, an enhanced breaking performance is attained.
REFERENCES:
patent: 3372258 (1965-05-01), Porter
patent: 4130781 (1978-12-01), Dethiefsen
Endoo Shunkichi
Hashimoto Akira
Kurosawa Yukio
Sato Takashi
Suzuki Kouji
Donovan Lincoln
Hitachi , Ltd.
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