Patent ID: 7787228
Filing Date: 2010-08-31
Classification: H01H,H02P

Abstract:
1. 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: main contacts for individual phases of said switchgear; operating mechanisms for the individual phases having a capability to independently activate the main contacts for the individual phases; voltage sensors for detecting individual phase voltages of the three-phase power source; and a contact closing control circuit for first outputting a contact closing signal to the operating mechanism for a first phase so that the main contact for the first phase corresponding to a central leg of said three-phase core is closed at a point in time of a first-phase voltage peak detected by the voltage sensor for the first phase and then outputting a contact closing signal to the operating mechanisms for second and third phases so that the main contacts for the second and third phases corresponding to two outer legs of said three-phase core are closed at a zero-voltage point of the first phase detected by the voltage sensor for the first phase according to a contact closing command.