Generator earth fault protection

Details Generator earth fault protection Generator earth fault protection

1978-01-16

1979-05-15

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Generator protective circuits

361 21, 361 42, H02H 706

Patent

active

041551079

ABSTRACT:
A generator set includes a main generator, a permanent magnet pilot alternator, a rectifier assembly connecting the pilot alternator output to first and second supply rails, a relay having a contact, and a regulator for the main generator having a semi-conductor output element, the output element, the field winding and the contact being connected in series between the first and second supply rails. A power supply circuit is transformer coupled to the pilot alternator and provides a stabilized power supply both for the regulator and the relay, such power supply circuit having an earthed terminal. A resistor is connected between the second supply rail and the earth terminal, so as to limit fault current in the event of an earth fault in the connection between the contact and the field winding.

REFERENCES:
patent: 3248608 (1966-04-01), Farkas et al.
patent: 3535589 (1970-10-01), Bourgeault

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