Single-phase magnetic operating mechanism vacuum circuit breaker and intelligent vacuum circuit breaker system

Abstract

The invention relates to a vacuum circuit breaker with a single-phase magnetic operation mechanism and an intelligent vacuum circuit breaker system comprising the circuit breaker and a driving controller. The magnetic operation mechanism of the circuit breaker comprises a tubular magnetic ring, an upper magnet yoke, a lower magnet yoke, a magnet loop assembly, a movable magnetic core, an exciting coil, a disconnecting spring and a contact pressure spring, wherein the upper magnet yoke and the lower magnet yoke are connected to the upper end and the lower end of the magnetic ring, the exciting coil is arranged in the magnetic ring, at least the upper portion of the magnetic core is located in a columnar space defined by an inner hole of the exciting coil, an output rod is arranged in the movable magnetic core in a vertical-penetrating mode and is coaxially sleeved with the disconnecting spring and the contact pressure spring, the upper end of the output rod is connected with a moving contact, the lower end of the disconnecting spring and the lower end of the contact pressure spring abut against the movable magnetic core, the upper end of the disconnecting spring abuts against the upper magnet yoke, and the upper end of the contact pressure spring and the output rod are relatively fixed. The vacuum circuit breaker is simple in structure, low in material and manufacturing cost, free of connecting bouncing and capable of keeping magnetism for a long time, achieving phase selection operation and on-line self-monitoring and meeting using requirements for intelligent power grids.

Description

technical field [0001] The invention relates to a single-phase vacuum circuit breaker adopting a permanent magnet operating mechanism and an intelligent system including the circuit breaker, which belongs to the field of high-voltage switchgear and can be used for power 3.6KV-40.5KV lines to close load current and short-circuit faults Current, but also can withstand short-circuit and peak current within the time specified in the national standard GB1984. Background technique [0002] The existing circuit breaker has the following characteristics: (1) The operating mechanism is a spring energy storage operating mechanism or a NdFeB permanent magnet operating mechanism. The spring energy storage operating mechanism has many mechanical parts, which is prone to mechanical failure, thus causing hidden dangers to the operation of the power system, and there is bounce when closing. However, the demagnetization rate of the NdFeB permanent magnet operating mechanism is very high dur...

AI Technical Summary

Problems solved by technology

There are many mechanical parts in the spring energy storage operating mechanism, which is prone to mechanical failure, which will cause hidden dangers to the operation of the power system, and there will be bounce when closing

However, the demagnetization rate of the NdFeB permanent magnet operating mechanism is very high during operation, which may cause the mechanism to fail; the opening and closing discharge capacitance is very large, up to hundreds of thousands of microfarads, so the requirements for the operating power supply capacity are relatively high, and this Large capacitor capacity will have potential safety hazards; in addition, due to the use of rare earth materials, the cost is high

(2) An operating mechanism drags the 3-phase circuit breaker to operate at the same time, the operating power is very large, and the phase selection operation cannot be realized, which cannot meet the phase selection operation requirements of the smart grid

(3) The operating mechanism and the vacuum arc extinguishing unit are arranged front and rear, and the front and rear directions occupy a large space, and the two are linked by a transmission mechanism composed of crank arms, connecting rods, etc. Axis requirements are high

(4) It cannot monitor its own operating status online, and cannot meet the requirements of the smart grid

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