Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1997-05-23
1998-12-29
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 13, H02H 300
Patent
active
058547290
ABSTRACT:
A device/method for actively interrupting fault current in an ac or dc power system before the fault current is capable of growing to peak magnitude or steady state condition, respectively, is presented. In an ac implementation, a commutating capacitance of desired polarity from one of two commutating circuits is coupled across a circuit interrupter comprising a pair of separable contacts. The circuit interrupter operates to open circuit the power system upon reaching zero current therethrough. The commutating capacitance of appropriate polarity actively drives the fault current to zero before the fault current reach peak magnitude, thereby allowing the circuit interrupter to open circuit the power system before the fault current's natural current zero. In dc implementation, the commutating capacitance is connected to dissipate a fault current while the system is in transient state, thereby protecting the power system from full steady state fault current condition. In both ac and dc implementations, the circuit interrupter is resettable upon clearing of a fault condition. The circuit interrupter can comprise a vacuum interrupter, a silicon-controlled rectifier or a thyristor. The approach is applicable to single phase or three-phase power systems.
REFERENCES:
patent: 3390305 (1968-06-01), Greenwood
patent: 3435288 (1969-03-01), Greenwood
patent: 3476978 (1969-11-01), Greenwood
patent: 3489951 (1970-01-01), Greenwood et al.
patent: 3796891 (1974-03-01), Kind et al.
patent: 3935509 (1976-01-01), Eidinger
patent: 4056836 (1977-11-01), Knauer
patent: 4172268 (1979-10-01), Yanabu et al.
patent: 4305107 (1981-12-01), Murano et al.
patent: 4307428 (1981-12-01), Yanabu et al.
patent: 4740858 (1988-04-01), Yamaguchi et al.
patent: 5402297 (1995-03-01), Ouchi et al.
patent: 5452170 (1995-09-01), Ohde et al.
Basil C. Papadias, "Approaches to Short-Circuit Current-Limiting", A Thesis Submitted to the Graduate Faculty of Rensselaer Polytechnic Institute in Partial Fulfillment of the Requirements for the Degree of Doctor of Engineering, Rensselaer Polytechnic Institute, Troy , New York, pp. 30-55 and 154-161 (Feb. 1975).
Degeneff Robert C.
Glinkowski Mietek T.
Gutierrez Moises R.
Gaffin Jeffrey A.
Sherry Michael J.
Utility Systems Technologies, Inc.
LandOfFree
Power system device and method for actively interrupting fault c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power system device and method for actively interrupting fault c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power system device and method for actively interrupting fault c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1428340