Control circuit for a circuit interrupter

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

1984-11-05

1986-08-12

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 361 95, H02H 344, H02H 308

Patent

active

046059822

ABSTRACT:
A control circuit is provided for operating a circuit interrupter in response to overcurrent in an alternating-current line in which the circuit interrupter is located. The control circuit includes a transducer for producing output current proportional to the current in the line. A time-current trip signal generator circuit responds to output current representative of moderate overcurrent in the line by producing a trip signal after the passage of a time period that is inversely related to the overcurrent. An instantaneous trip signal generator circuit produces a trip signal after a predetermined time interval in response to output current between a minimum and maximum magnitude and increasing at a rate greater than a selected rate, which conditions indicate the presence of high overcurrent in the line. In the preferred arrangement, the predetermined time interval is measured from the time that the rate of change of the current exceeds a predetermined rate. Accordingly, when the onset of high overcurrent is detected, the current is interrupted with a minimum possible delay while substantially reducing undesired response to noise and false signals.

REFERENCES:
patent: 3290556 (1963-01-01), Graham et al.
patent: 3317791 (1967-05-01), Price et al.
patent: 3689801 (1972-09-01), Engel et al.
patent: 3713005 (1973-01-01), Engel
patent: 3831061 (1974-09-01), Boyd
patent: 4000446 (1976-12-01), Vandevier et al.
patent: 4017766 (1977-04-01), Vercellotti et al.
patent: 4149210 (1979-04-01), Wilson
patent: 4203142 (1980-05-01), Lee
patent: 4258403 (1981-03-01), Shimp
patent: 4297741 (1981-10-01), Houell
patent: 4345292 (1982-08-01), Jaeschke et al.
patent: 4347541 (1982-09-01), Chen et al.
patent: 4380785 (1983-04-01), Demeyer
patent: 4393431 (1983-07-01), Gilker
patent: 4442472 (1984-04-01), Panz et al.
patent: 4567540 (1986-01-01), Ruta
"Pyrister", Carbone Ferraz Inc.
C. Bottger, Ratingen, "The Application of I.sub.s -Limiters in Three Phase Systems" Color-Emag Elekrizitats-Aktiengesellshaft D-403 Ratingen.
"Fault Levels Too High?", Calor Emag Leaflet No. 119716e.
M. C. Blythe, "Limiting Fault Currents Between Private and Public Networks", Calor-Emag Elekrizitats-Aktiengesellschaft.
N. Miyoshi & O. Fukushima, "Ultra-High Speed Protection Device-Fuji Ultrup Fuse", Fuji Electric Review, UOC 6L1.316.932.2, vol. 18, No. 1.
T. Keders & A. Leibold, "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.
"Prototype Fault Current Limiter", EPRI, EPRI EL-1396, Projects 281-2,-4, Final Report, May 1980, title page through pp. 2-3, and pp. 7-1 to 7-19, and 8-1.
P. J. Kroon & W. N. Rothenbuhler, "The Development and Application of 69-kV Fault Current Limiter", 7th IEE/PES Transmission and Distribution Conference and Exposition, Apr. 1-6, 1979.
J. Wafer, "The Impack of Solid-State Technology on Molded Case Circuit Breakers" IEEE Transactions on Industry Applications, vol. 1A-16, No. 5, Sep./Oct. 1980.

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-1947537