Device for detecting a ground fault in the rotor winding of an e

Details Device for detecting a ground fault in the rotor winding of an e Device for detecting a ground fault in the rotor winding of an e

1984-06-12

1987-05-19

Leung, Philip H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 46, H02H 326

Patent

active

046672621

ABSTRACT:
In the invention, a ground current, impressed, in the case of a ground fault, by an offset-voltage source connected into an earth line and capacitively coupled to the rotor winding, is detected both in the ground line and in the exciter circuit via at least one current transformer which is preferably constructed as a ring-core transformer. By suitable summing of the ground current flowing in the ground line with that flowing in the exciter circuit, an indication is achieved which is selective with respect to the location of the ground fault in the exciter circuit.

REFERENCES:
patent: 3959693 (1976-05-01), Coley et al.
patent: 3999104 (1976-12-01), Lardennois
patent: 4012668 (1977-03-01), Wittlinger
patent: 4015169 (1977-03-01), Misencik
patent: 4159499 (1979-06-01), Bereskin
patent: 4224652 (1980-09-01), Fiorentzis
patent: 4280162 (1981-07-01), Tanka et al.

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