Buchanan Ingersoll & Rooney PC
Switchgear control apparatus
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.
Mitsubishi Electric Corporation
H H
H01H H02P
inventional inventional
Kenji Tomohito Sadayuki Haruhiko
Kamei Mori Kinoshita Koyama