H - Electricity – 02 – H
Patent
H - Electricity
02
H
318/100, 321/91
H02H 3/26 (2006.01) H02H 3/253 (2006.01) H02H 7/00 (2006.01) H02H 7/09 (2006.01) H02H 11/00 (2006.01) H02M 7/162 (2006.01)
Patent
CA 1070756
ABSTRACT OF THE DISCLOSURE In a phase monitoring arrangement for a three phase network which supplies a controlled d.c. motor through a controlled converter, a power line dependent discriminator along with R-C circuits forms a smoothed, rectified monitoring voltage which depends on the phase sequence and is sensitive there- to and to phase failure along with a supplementary monitoring voltage depen- dent only on phase failure, the rectified monitoring voltage and supplementary monitoring voltage being supplied to an evaluating circuit comprising dif- ferential comparing amplifiers at which the monitoring voltages are compared with constant reference voltages independent of faults and the output thereof used to control a switching circuit and a current regulator so that in the event of incorrect phase sequence or of a phase failure, the switching cir- cuit feeds a blocking signal which suppresses firing pulses to the controlled converter and the current regulator feeds a control signal to control the converter to its operating limit.
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