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AssigneeMitsubishi Electric Corporation
InventorsHaruhiko Koyama, Tomohito Mori, Kenji Kamei, Sadayuki Kinoshita
Estimating the term…
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.
A switchgear control apparatus for controlling close operation of a switchgear for connecting a three-phase reactor having a three-phase core to a three-phase power source, said switchgear control apparatus comprising:
Dependencies are inferred from the claim text.