Ground fault protective apparatus of field windings

Details Ground fault protective apparatus of field windings Ground fault protective apparatus of field windings

1978-02-21

1980-02-05

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

322 25, 322 59, 361 79, 361 20, 364482, H02H 706

Patent

active

041875257

ABSTRACT:
A resistor, a DC source and a current converter are connected in series between one terminal of the field winding and the ground. When a ground fault occurs on the field winding, it is detected by the output of a voltage detector connected across the resistor or the output of the current converter, and an alarm device is operated. At the same time, another resistor is connected between the other terminal of the field winding and the current converter through a switch, and the magnitude of the ground fault is calculated by the outputs of the voltage detector and of the current converter before and after closure of the switch. When the magnitude of the ground fault is large the generator is disconnected.

REFERENCES:
patent: 2825006 (1958-02-01), Leppla
patent: 3286129 (1966-11-01), Gagniere
patent: 3631321 (1971-12-01), Eisenstadt
patent: 4107778 (1978-08-01), Nii et al.
"Generator-und-Anlagenschutz Rotorords Chlusschutzrelais", IWX161 Zusatzgeraet YWXIII, by Brown Boveri & Company Ltd., 25-8-75.

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