Power switching apparatus and method of controlling the same

Details Power switching apparatus and method of controlling the same Power switching apparatus and method of controlling the same

2008-02-25

2010-06-22

Enad, Elvin G (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

C335S002000, C361S005000, C361S015000

Reexamination Certificate

active

07741937

ABSTRACT:
A power switching apparatus includes a breaker unit, an operating unit, a measuring unit, and a controlling unit. The breaker unit is connected on a three-phase current line, and includes switches each corresponding to one of phases of the three-phase current line. The operating unit simultaneously turns on or off the switches. The measuring unit measures a current flowing in each phase, and determines a time point where current flowing in one of the phases becomes zero as a reference time point. The controlling unit controls, when interrupting load current, the operating unit to turn off the switches in a range from 20 degrees to 40 degrees of an electric angle from the reference time point.

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patent: 2004-55420 (2004-02-01), None

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