Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1988-11-23
1990-05-01
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 68, 361 77, H01H 300
Patent
active
049223682
ABSTRACT:
Discriminating circuits are coupled to receive signals from a protected transmission circuit. Each discriminating circuit also receives from a direction detector signals indicating whether any fault which occurs is forward of, or reverse of, a predetermined point. The discriminating circuit is arranged to produce an output signal to trip a circuit breaker of the protected circuit only if a fault occurs within the protected circuit. In this respect, the discriminating circuit only outputs a trip signal if it receives within the same time period both a signal from the direction detector indicating that the fault is appropriately located, and high frequency signals from the protected circuit. The system thus utilizes the high frequency noise invariably generated when faults arise in transmission circuits. The system for protecting transmission circuits has the advantage that it provides good discrimination of faults without requiring communication links between discriminating circuits at each end of a protected circuit, as has previously been necessary.
REFERENCES:
patent: 4438475 (1984-03-01), Haley
patent: 4466071 (1984-08-01), Russell, Jr.
patent: 4538196 (1985-08-01), Sun et al.
patent: 4751604 (1988-06-01), Wilkinson
UDO et al., "Impulse Noise Voltage in a Transmission Line Generated by the Fault" IEEE Transmission and Distribution Committee . . . May 5, 1966, pp. 1-14.
Balser et al., "A Microprocessor-Based Technique for Detection of High Impedance Faults", IEEE Transactions on Power Delivery, vol. PWRD-1, No. 3, Jul. 1986.
Aucoin et al., "Distribution Impedance Fault Detection Utilizing High Frequency Current Components", IEEE Transactions of Power Apparatus and Systems, vol. PAS-101, No. 6, Jun. 1982.
Jennings Derek S.
National Research Development Corporation
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