| 摘要 |
The present invention relates to a circuit breaker (1) for use in high voltage direct current (HVDC) networks. The circuit breaker (1) includes a dc line (6) that in use is electrically connected to incoming and outgoing dc lines (8, 10) of the network. A fault-interrupting switch contact system (2) has contacts that are opened and closed by trigger signals provided by a controller (30). The circuit breaker (1) also includes a first switching aid network (12) including first and second rectifier strings (16a, 16b) containing series connected diodes (D1...Dn) that define a first H-bridge rectifier, a snubber string (14) containing series connected thyristors (T1...Tn), a capacitor (C1) and a bleed resistor (R2), a pre-charge string (18) containing series connected thyristors (T1...Tn) and a resistor (R1), and a surge arrester (20). When the fault-interrupting switch contact system (2) is actuated an arc is formed between the rapidly opening contacts. The switching aid network (12) causes the arc to transit into and thereafter remain in an astatic region until it is extinguished. |
