Direct-current breaker for high power for connection into a direct-current carrying high-voltage line
First Claim
1. A d.c. breaker for high power and for connection into a high-voltage d.c, line, and with a breaking member which comprises:
- a) a controllable semiconductor device,b) control members to control the semiconductor member such that a zero crossing of the current through the breaking member is obtained,and with a capacitor which is connected in parallel with the breaking member and to which the current in said line is commutated over to said capacitor after a zero crossing of the current through the breaking member,the breaking member comprises first and second normally closed electrically series-connected mechanical breaks traversed by the current in said line and opened for breaking of said current,the capacitor is in parallel with the series connection of the two breaks,the semiconductor member is connected in parallel with said first break,the breaker comprises an inductive member which is connected in a circuit with the capacitor and the first and second breaks for forming an oscillating circuit comprising the inductive member, the capacitor and the first and second breaks, andthe control members, in connection with the opening of the series-connected breaks, control the semiconductor member periodically for generating a growing oscillation in the oscillating circuit and hence a zero crossing of the current through the second break.
1 Assignment
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Accused Products
Abstract
A high power d.c. breaker for connection into a d.c. carrying high-voltage line (L), has two normally closed and electrically series-connected mechanical breaks (BSI, BSII) adapted to be traversed by the line current (I) and to be opened for breaking the current. A capacitor (CB) is connected in parallel with the series connection of the breaks. A semiconductor member (HO) is connected in parallel with one of the breaks (BSI). Upon opening the breaks, a control member (SO) controls the semiconductor member such that a zero crossing of the current through the second break (BSII) is obtained, whereby the line current (I) is commutated over to the capacitor. (FIG. 1)
228 Citations
8 Claims
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1. A d.c. breaker for high power and for connection into a high-voltage d.c, line, and with a breaking member which comprises:
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a) a controllable semiconductor device, b) control members to control the semiconductor member such that a zero crossing of the current through the breaking member is obtained, and with a capacitor which is connected in parallel with the breaking member and to which the current in said line is commutated over to said capacitor after a zero crossing of the current through the breaking member, the breaking member comprises first and second normally closed electrically series-connected mechanical breaks traversed by the current in said line and opened for breaking of said current, the capacitor is in parallel with the series connection of the two breaks, the semiconductor member is connected in parallel with said first break, the breaker comprises an inductive member which is connected in a circuit with the capacitor and the first and second breaks for forming an oscillating circuit comprising the inductive member, the capacitor and the first and second breaks, and the control members, in connection with the opening of the series-connected breaks, control the semiconductor member periodically for generating a growing oscillation in the oscillating circuit and hence a zero crossing of the current through the second break. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification