Electrical power supply fault detecting system

Details Electrical power supply fault detecting system Electrical power supply fault detecting system

1977-11-28

1979-01-02

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

340645, 361 48, H02H 328

Patent

active

041330170

ABSTRACT:
To detect system ground faults and shorted alternator output winding turn-to-turn faults, the series combination of a resistor and the operating coil of an electrical relay having a normally closed contact pair is connected between the neutrals of two parallel connected polyphase alternator output winding groups, the junction between the resistor and operating coil is connected through a resistor to ground and the normally closed relay contact pair is connected in series in the alternator exciting field winding energizing circuit. To detect open diodes in the main polyphase diode bridge type full-wave rectifier circuit, an auxiliary polyphase full-wave rectifier circuit having the operating coil and normally closed contacts of two relays in series in each leg is provided. Upon the failure of a diode of the main rectifier circuit, sufficient current to operate the corresponding relay in the auxiliary rectifier circuit is diverted therethrough. Upon the operation of one of the auxiliary rectifier circuit relays, the magnitude of the energizing potential supplied to the alternator exciting field winding is reduced and upon the operation of more than one of the auxiliary rectifier circuit relays, the alternator exciting field winding energizing circuit is interrupted.

REFERENCES:
patent: 2405397 (1946-08-01), Bedford
patent: 3270331 (1966-08-01), Kirk et al.
patent: 3496414 (1970-02-01), Logston
patent: 3675080 (1972-07-01), Bath

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