Circuit breaking device

Details Circuit breaking device Circuit breaking device

1996-08-06

1998-04-07

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

057371628

ABSTRACT:
An objective of this invention is to provide a DC circuit breaking device having functions for transmitting direct currents to an electric power system and interrupting direct currents to the electric power system under abnormal conditions such as grounding and short-circuits, where the DC circuit breaking device can minimize the capacity of a condenser for the commuting circuit while rapidly changing the arc voltage to cause arc currents to be quickly extended and vibrated in order to interrupt direct currents in a short arc time. This DC circuit breaking device includes a main DC circuit breaker for interrupting the transmission of direct currents to an electric power system and a DC circuit breaker that is connected in series to the main DC circuit breaker and which is smaller than the main DC circuit breaker. The circuit breaking device also includes a commutation circuit that is connected in parallel to the DC circuit breaker and the small DC circuit breaker which are connected together in series and which is constituted by a reactor and a condenser. The circuit breaking device also includes a surge absorber for absorbing a surged voltage applied to for the condenser.

REFERENCES:
patent: 4442469 (1984-04-01), Yanabu et al.
patent: 5214557 (1993-05-01), Hasegawa et al.
Yosida, Yoshio, A Study of DC-Current Interruption for GCB with Parallel Capacitor and Reactor, Conference of the Power and Energy Department of the Electric Society (Japan, 1994), No. 621, pp. 824 and 825 (with an English abstract of the relevant portion).
Tokuyama, Shunji, et al., Large DC Current Breaking by Commutating Method Using Negative Resistance Characteristic of Gas Arc, Academy of Electric Engineering, Switch Protective Device Research Group, pp. 41-49. (English abstract provided).

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