Phase monitoring arrangement for a three phase network supplying

Details Phase monitoring arrangement for a three phase network supplying Phase monitoring arrangement for a three phase network supplying

1976-09-28

1978-04-11

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

361 77, 361 92, H02H 326

Patent

active

040842053

ABSTRACT:
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 thereto and to phase failure along with a supplementary monitoring voltage dependent only on phase failure, the rectified monitoring voltage and supplementary monitoring voltage being supplied to an evaluating circuit comprising differential comparing amplifiers at which the monitoring voltages are compared with constant reference voltages independent of faults and the output thereof used to control switching means and a current regulator so that in the event of incorrect phase sequence or of a phase failure, the switching means feed 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.

REFERENCES:
patent: 2858457 (1958-10-01), Epstein et al.
patent: 3401308 (1968-09-01), Darke
patent: 3551748 (1970-12-01), Maynard et al.

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