Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Reexamination Certificate
2007-10-16
2010-08-31
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
Reexamination Certificate
active
07787228
ABSTRACT:
A switchgear control apparatus includes main contacts for first to third phases, operating mechanisms for activating the main contacts for the respective phases, voltage sensors for detecting phase voltages of a three-phase power source, and a contact closing control circuit. The contact closing control circuit first outputs a contact closing signal to the first-phase operating mechanism to close the first-phase main contact corresponding to a central leg of a core of a three-phase reactor at a first-phase voltage peak, and then a contact closing signal to the second- and third-phase operating mechanisms to simultaneously close the second- and third-phase main contacts corresponding to two outer legs of the reactor core at a zero-voltage point of the first phase three-quarter cycle later than close of the main contact for the first phase.
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Chinese Office Action, dated Jan. 8, 2010.
Office Action dated Jan. 25, 2010 in corresponding German Patent Application No. 10 2007 057 236.2-32, and an English-language translation, 6 pages.
Lee et al, “A Method to Decide the Switching Instants of Controlled Switching Circuit Breaker for Shunt Reactors”, Transmission and Distribution Conference and Exhibition 2002: Asian Pacific, IEEE/PES< vol. 3, Oct. 6-10, 2002, pp. 1760-1765.
Kamei Kenji
Kinoshita Sadayuki
Koyama Haruhiko
Mori Tomohito
Buchanan & Ingersoll & Rooney PC
Jackson Stephen W
Mitsubishi Electric Corporation
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