Sulfur hexafluoride circuit breaker and electromagnetic operating mechanism thereof

Abstract

The invention relates to a sulfur hexafluoride circuit breaker and an electromagnetic operating mechanism thereof. The sulfur hexafluoride circuit breaker comprises a permanent magnet column which isarranged vertically and a permanent magnet connected on the permanent magnet column in a sliding way. A magnetic force reducing locking device is connected on the permanent magnet column. The internalpart of the magnetic force reducing locking device is provided with a sliding groove. A compression spring is fixedly connected on the internal wall of the sliding groove. One end of the compressionspring is fixedly connected with a locking rod. The external surface of the locking rod is provided with a limiting groove. The internal part of the magnetic force reducing locking device is providedwith a locking groove. According to the sulfur hexafluoride circuit breaker and the electromagnetic operating mechanism thereof, the magnetic induction intensity B decreases during the slow degaussingof the permanent magnet and the magnetorheological fluid inside the magnetorheological fluid locking body liquefies so as to unlock the locking rod. The locking rod is ejected because of the action of the compression spring and then the pushing rod is locked and the closing mechanism is unable to work so that arc harm caused by insufficient pushing force can be avoided the safety protection capability of the equipment can be improved.

Description

technical field [0001] The invention belongs to the field of operating mechanisms of vacuum circuit breakers, in particular to a sulfur hexafluoride circuit breaker and its electromagnetic operating mechanism. Background technique [0002] The circuit breaker is an important switching device in the power system, which is responsible for the dual tasks of control and protection. For high-voltage circuit breakers, it is required that the operating mechanism can not only obtain a higher opening and closing speed, but also quickly realize automatic reclosing operation. The operating mechanism plays an important role in the circuit breaker. It not only ensures the long-term operation reliability of the circuit breaker, but also meets the requirements of the arc extinguishing characteristics for the operating mechanism. The operating mechanism should achieve good opening and closing actions of the high-voltage circuit breaker, and the output force should have a good match with t...

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Problems solved by technology

[0003] However, the above-mentioned permanent magnet linear thrust operating mechanism for vacuum circuit breakers, the prerequisite for the normal operation of the equipment is that the permanent magnets in the comparison document must always have magnetism, and the magnetic force must not be reduced. Various factors cause the magnetic force to drop, and when the magnetic force drops, the force F=BIL generated by electromagnetic induction, the magnetic induction intensity B decreases, and the force generated under the condition of constant current will gradually decrease until the permanent magnet Lost magnetism and becomes 0, the thrust also becomes 0, but the push rod of the operating mechanism needs a certain amount of force in the process of pushing to perform the closing operation. If the force is too small, it will inevitably lead to insufficient closing, and If the circuit breaker is not closed in place, a large arc will be generated, which is extremely harmful to the equipment and is prone to safety accidents

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