Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1978-02-06
1979-04-10
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
324 51, 361 20, 361 44, 361 47, 340650, H02H 316
Patent
active
041492080
ABSTRACT:
A method of, and apparatus for, protecting electrical devices, such as generators connected in parallel against ground faults or shorts, wherein when there arises a ground short at one of the parallely connected generators a ground or earth current (response signal) flows between the fault location and a ground location. The network is grounded at the ground location by means of a ground transformer and a ground resistance. In order to essentially completely detect the ground short the phase of an alternating signal is modulated to produce an alternating injection or test signal which is delivered to the network containing the parallely connected generators. A response signal corresponding to the injection signal and indicative of the ground short is derived from the electrical network. The modulated alternating signal may be at the network frequency and modulation of the phase thereof 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: 3978465 (1976-08-01), Goode
patent: 4106071 (1978-08-01), Sun et al.
BBC Brown Boveri & Company Limited
Kleeman Werner W.
Moose Jr. Harry E.
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