Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Patent
1995-11-21
1998-03-10
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
361 3, 361 2, 361 8, 361 13, 361 63, 361115, H02H 308
Patent
active
057268436
ABSTRACT:
A plurality of solid-state switches are provided in parallel with a main circuit switch. A main circuit current is detected by a first current detecting device. A current flowing in each of the plurality of solid-state switches is detected by a second current detecting device. Based on the detected currents of the first and second current detecting devices, the main circuit switch is commanded to open and each solid-state switch is commanded to close by a control circuit, when a fault is detected by a fault detecting circuit. At this point of the process when the main circuit switch is opened, when a commutation anomaly is detected by a commutation detecting circuit, the conducting status of each solid-state switch is maintained. When the commutation achieves a normal status, each solid-state switch is interrupted and circuit breaking, at the point the capability of each solid-state switch is exceeded, is prevented.
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IEEE Transactions on Power Delivery, vol. 9, No. 3, Jul. 1994, "400V Class High-Speed Current Limiting Circuit Breaker for Electric Power System", T. Genji et al, pp. 1428-1435.
Arita Hiroshi
Kida Junzo
Gaffin Jeffrey A.
Hitachi , Ltd.
Kost Jason L. W.
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