Patent ID: 6433980
Filing Date: 2002-08-13
Classification: H01H

Abstract:
A controlled switching device for making a breaker at a target make phase of an AC interpole voltage applied across poles of the breaker, the device comprising:interpole voltage measuring means for measuring an AC interpole voltage applied across poles of a breaker when open; zero time point detection means for detecting and storing in a memory, over time, a plurality of interpole voltage zero time points when the interpole voltage is instantaneously zero, based on measured interpole voltage; and control means for output of a close control signal; predicting a predicted close time of the poles, measured from the output of the close control signal to actual closing of the poles, at a target close point; determining a close command detection time, measured from the interpole voltage zero time point preceding and closest in time to a close command to receipt of the close command; obtaining a pre-arc time measured from a target make phase to the actual closing at the target close point; determining a close control delay time, from receipt of the close command until issuance of the close command signal, within one-half period of the interpole voltage; and outputting the close control signal after lapse of the close control delay time so that the making is completed at the target make phase.