Electricity: electrical systems and devices – Safety and protection of systems and devices – Automatic reclosing
Reexamination Certificate
2007-10-09
2009-11-10
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Automatic reclosing
Reexamination Certificate
active
07616419
ABSTRACT:
A switchgear control apparatus includes a zero point interval detecting circuit, an interruption time judgment circuit and a reclosing time decision circuit. The zero point interval detecting circuit detects time intervals between successive zero points of a main circuit current. The interruption time judgment circuit judges that interruption time of the main circuit current is time of a zero point immediately preceding a zero point at which a difference between the time interval between two successive zero points and half the period of a commercial AC voltage exceeds a specific value. Upon detecting the gradient of the main circuit current at the interruption time, the reclosing time decision circuit sets reclosing time at a point in phase where the AC voltage has a maximum negative value if the gradient is positive, and at a point in phase where the AC voltage has a maximum positive value if the gradient is negative.
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Kamei Kenji
Kinoshita Sadayuki
Koyama Haruhiko
Mori Tomohito
Buchanan & Ingersoll & Rooney PC
Hoang Ann T
Jackson Stephen W
Mitsubishi Electric Corporation
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