Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1980-07-16
1982-05-11
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 82, H02H 316, H02H 318
Patent
active
043297277
ABSTRACT:
A system for rapidly detecting short circuits on power transmission lines in electrical power systems is provided to protect the power network from the effects of short circuits within the system. The instant invention provides a system for detecting multi-phase faults and causing three-phase tripping when required and also detecting single-phase faults and providing a control signal to trip the single-phase that is faulted. Signals proportional to system voltages are applied to a memory circuit to produce signals indicative of the steady-state condition of the circuit. Three other signals indicative of the voltage drops of the transmission line phases are produced by applying a signal proportional to the instantaneous current flow through each phase to replica impedance circuits. For each phase, the difference between the voltage drop and the system voltage is multiplied by a polarizing memory voltage. The signal for each phase indicates the status of that phase and can be used to generate a single-phase trip signal for a single line to ground fault. By adding the three single-phase signals, a signal is produced that can be used to perform high speed detection of multi-phase faults. Following this determination the appropriate circuit breaker operating signal is provided to activate the circuit breaker or breakers protecting the part of the system faulted.
REFERENCES:
patent: 3673425 (1972-06-01), Plichta
patent: 3697811 (1972-10-01), Little
patent: 4161011 (1979-07-01), Wilkinson
Dommel et al., "High Speed Relaying Using Traveling Wave Transient Analysis", Paper A-78-214-9, IEEE PES 1978, Winter Meeting, New York, N.Y.
Esztergalyos et al., "Development, Design Application and Field Experience of an Ultra High Speed Relaying System for EHV/UHV Transmission Lines", Pennsylvania Electric Association Relay Committee Mtg., October, 1978, Harrisburg, Pa.
Takagi et al., "Digital Differential Relaying System for Transmission Line Primary Protection Using Traveling Wave Theory--Its Theory and Field Experience", Paper A-79-096-9, IEE PES 1979 Winter Meeting, New York, N.Y.
Davis James C.
Eisenzopf Reinhard J.
General Electric Company
Snyder Marvin
LandOfFree
Directional power distance relay does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Directional power distance relay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Directional power distance relay will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-759925