Phase failure detection circuit for multi-phase systems

Details Phase failure detection circuit for multi-phase systems Phase failure detection circuit for multi-phase systems

1976-01-28

1977-05-31

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

340253B, 340248B, H02H 324

Patent

active

040272044

ABSTRACT:
A three-phase rectifier circuit is connected to provide a d-c output voltage as a function of the three-phase energy passed to the rectifier circuit. This energy is reduced in amplitude over a voltage divider circuit and passed through an optically-coupled detector circuit to provide a control signal indicating the presence of energy on all phase conductors of the supply line. If a fuse blows in one line, or if the power on that line is interrupted for any reason, the ripple content of the rectified voltage increases. This is sensed by a detector circuit to energize an alarm and/or interrupt the main power bus to the load.

REFERENCES:
patent: 2759177 (1956-08-01), Hightower
patent: 3160786 (1964-12-01), Faglie
patent: 3242383 (1966-03-01), Opad
patent: 3243796 (1966-03-01), Harmon et al.
patent: 3343038 (1967-09-01), Johnson
patent: 3452347 (1969-06-01), Stimson
patent: 3749944 (1973-07-01), Luebrecht
patent: 3854089 (1974-12-01), Emler
IBM Technical Disclosure Bulletin, vol. 16, No. 8, pp. 2760-2761, Jan. 1974.
IBM Technical Disclosure Bulletin, vol. 17, No. 12, p. 3513, May 1975.

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