Control circuit for a circuit interrupter

Details Control circuit for a circuit interrupter Control circuit for a circuit interrupter

1988-07-15

1990-04-10

Shoop, Jr., William M.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 361110, H02H 3093

Patent

active

049165739

ABSTRACT:
A control circuit is provided for a circuit interrupter that achieves an inverse-time characteristic for overcurrents that include instantaneous current levels higher than the interrupting capability of the circuit interrupter by synchronizing the operation of the circuit interrupter to ensure that circuit interruption takes place when the instantaneous current is within the interrupting capability of the circuit interrupter. This interrupting capability is similar to let-through current and is defined by the instantaneous magnitude of the current at the time of interruption or at a particular stage thereof. The control circuit is responsive to a time-current characteristic signal generator that provides a time-current signal in response to overcurrent after the passage of a time delay that is inversely related to the overcurrent. The control circuit utilizes the time-current signal to permit asynchronous operation of the circuit interrupter when the peak of the overcurrent is expected to be within the interrupting capabilities of the circuit interrupter and to control operation of the circuit interrupter in a manner synchronized with the overcurrent when the peak of the overcurrent is expected to exceed the interrupting capabilities of the circuit interrupter; the interruption in the synchronized manner being arranged to occur when the instantaneous current is within the interrupting capabilities of the circuit interrupter. If such overcurrents are predicted, the rate of change of the current and the instantaneous current being within a predetermined current range are utilized to synchronize operation of the circuit interrupter.

REFERENCES:
patent: 3634729 (1972-01-01), Hendry et al.
patent: 3831061 (1974-08-01), Boyd
patent: 4002950 (1977-01-01), Dickerson
patent: 4017766 (1977-04-01), Vercellotti et al.
patent: 4060844 (1977-11-01), Davis et al.
patent: 4104691 (1978-08-01), Shimp et al.
patent: 4114089 (1978-09-01), Ahmed
patent: 4152744 (1979-05-01), Pang
patent: 4193104 (1980-03-01), Nercessian
patent: 4200897 (1980-04-01), Dawley
patent: 4219858 (1980-08-01), DePuy et al.
patent: 4258403 (1981-03-01), Shimp
patent: 4297741 (1981-10-01), Howell
patent: 4347541 (1982-08-01), Chen et al.
patent: 4442472 (1984-04-01), Pang et al.
patent: 4464709 (1984-08-01), Barter
patent: 4544981 (1985-10-01), Hakoopian
patent: 4567540 (1986-01-01), Ruta
patent: 4571658 (1986-02-01), Ruta
patent: 4571659 (1986-02-01), Demeyer et al.
patent: 4587590 (1986-04-01), Bala et al.
patent: 4589073 (1986-05-01), Kidd
patent: 4597025 (1986-06-01), Rutchiz et al.
patent: 4605982 (1986-08-01), Harner et al.
Keders et al., "A Current--Limiting Device for Service Voltages up to 34.5 kV", presented at the IEEE PES Summer Meeting, Portland, OR, Jul. 18-23, 1976.
Bottger, "The Application of Is--Limiters in Three Phase Systems", pp. 1-7, 1967, Calor--Emag Company, Germany.
Calor--Emag Company, Leaflet No. 1197/6E, "Fault Levels Too High?", 2 pages, date unknown.
Blythe, M. C., "Limiting Fault Currents Between Private and Public Networks", 4 pages, Oct. 5, 1973, reprinted from Electrical Review, Calor--Emag.
Kroon, P. J., "The Development and Application of a 69 kV Fault Current Limiter", pp. 237-244, Apr. 1, 1971, 7th IEEE/PES Transmission and Distribution Conference and Exposition.
"Pyristor Pyrotechnic Systems", Carbone Ferraz, Inc. brochure, date unknown.
"Prototype Fault Current Limiter", EPRI Report, EL--1396, May 1980, title page through p. 2--3, and pp. 7--1 to 7--19, and 8--1.

Affiliated with

Also associated with

Rating

Control circuit for a circuit interrupter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control circuit for a circuit interrupter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control circuit for a circuit interrupter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2303217