Electronic trip device comprising a correcting device

Details Electronic trip device comprising a correcting device Electronic trip device comprising a correcting device

1993-05-06

1998-11-10

Medley, Sally C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361103, H02H 300

Patent

active

058353259

ABSTRACT:
The trip device with an electronic processing unit which gives a tripping order in terms of the rms value of the current measured by current transformers and of the threshold and time delay setpoints. The non-linearity of response of the current transformers is corrected by a device which modifies the current, threshold, or time delay values. These corrected values enable precise trippings to be achieved in compliance with the values of the current flowing in the circuit breaker. The type of correction is adapted to the circuit breaker rating by parameters obtained by tests and previously stored in a device.

REFERENCES:
patent: 3849706 (1974-11-01), Johnson et al.
patent: 4360880 (1982-11-01), Brodie et al.
patent: 4432031 (1984-02-01), Premerlani
patent: 4879626 (1989-11-01), Kim
patent: 5224011 (1993-06-01), Yalla et al.
"A Digital Multifunction Protective Relay", Yalla, IEEE Transactions on Power Delivery, vol. 7, No. 1, Jan. 1992, New York, USA, pp. 193-201.
"Computer-Aided Coordination of Overcurrent-Time Protection", SACHS et al., Power Engineering & Automation, vol.7, No. 2, Apr. 1985, Berlin, Germany, pp. 72-76.

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