Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1982-04-23
1984-06-05
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 30, 361 84, 361 87, H02H 708
Patent
active
044531907
ABSTRACT:
A method of short-circuit protection of an electrical three-phase machine, realized in a short-circuit protection device for a three-phase electrical machine, provides that phase currents are formed in phases of the stator winding of a three-phase electrical machine and, concurrently, a magnetic flux is produced by the end loops of coil groups of each phase in the stator winding, and a reverse current is separated from phase currents by a reverse current discriminating unit. Afterwards, current measuring and comparing units simultaneously measure the reverse current and the total electromotive force, produced by the magnetic flux in conditions excluding short-circuits in the stator winding and added up by a means for summing and converting magnetic fluxes into the electromotive force. In case the measured magnitude of the current and the value of the electromotive force exceed the maximum, three-phase electrical machine disconnection signal shapers produced respective signals which cut out the machine.
REFERENCES:
patent: 3522478 (1970-08-01), Reis
patent: 3697811 (1972-10-01), Little
patent: 3970897 (1976-07-01), Tamir et al.
G. G. Gimoian, Relay Protection of Mining Electrical Installations, Moscow, Nedra Publ., 1978.
Baida Dmitry F.
Chepeljuk Yakov Z.
Kletsel Mark Y.
Novozhilov Alexandr N.
Polyakov Valentin E.
Pavlodarsky Industrialny Institut
Salce Patrick R.
LandOfFree
Method of short circuit protection of electrical three-phase mac does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of short circuit protection of electrical three-phase mac, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of short circuit protection of electrical three-phase mac will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1500963