MEDIUM VOLTAGE CIRCUIT BREAKER WITH VACUUM INTERRUPTERS AND A DRIVE AND METHOD FOR OPERATING THE SAME

摘要

The invention relates to a Medium voltage circuit breaker with vacuum interrupters and a drive and method for operating the same wherein the drive is provided with a magnetic actuator with a yoke, and an anchor, wherein at least the yoke or the anchor is movable, and the movable part of the drive is coupled to the movable part of a switch, and that the yoke is provided with an actuation coil. In order to create eddy currents in the actuator of the drive of an aforesaid circuit breaker in a very effective and self-regulating, but constructively easy way, and in order to limit the operation speed of the circuit breaker, the invention is, that the actuation coil is being driven actively, and that the yoke is provided with a further passive coil, which is coupled with the actuation coil only inductively and which has short-circuited terminals, and with at least one permanent magnet, arranged inside or at the usually fixed yoke, by which the magnetic flux will be further concentrated and/or enhanced towards the airgap to the usually movable anchor.