Method and apparatus for detecting ground shorts in the rotor ci

Details Method and apparatus for detecting ground shorts in the rotor ci Method and apparatus for detecting ground shorts in the rotor ci

1978-02-06

1980-09-23

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324 51, 324158MG, 361 20, 361 47, 340650, H02H 706, H02H 316

Patent

active

042246520

ABSTRACT:
A method, and apparatus for, protecting an object, and specifically detecting ground shorts in the rotor circuit of a generator, wherein for essentially completely detecting a ground short the phase of an alternating signal is modulated to produce an alternating injection or test signal which is delivered to the object to be protected, i.e. the rotor circuit. A response signal corresponding to the injection signal and indicative of the ground short is derived from the rotor circuit. The modulated alternating signal may be at the network frequency and modulation of the phase thereon preferably encompasses continuously switching the phase of the alternating signal between two phase positions in the sense of a phase oscillation. The alternating signal is preferably in the form of an alternating voltage.

REFERENCES:
patent: 3066284 (1962-11-01), McKinley et al.
patent: 3710238 (1973-01-01), Peterson
patent: 3783340 (1974-01-01), Becker
patent: 3971007 (1976-07-01), Borkovitz et al.
patent: 3975663 (1976-08-01), Moorey
patent: 3991364 (1976-11-01), Wiznerowicz
patent: 4080642 (1978-03-01), Stolarczyk
patent: 4149208 (1979-04-01), Fiorentzis

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