Permanent-magnetic high-voltage vacuum circuit breaker

Abstract

The invention discloses a permanent-magnetic high-voltage vacuum circuit breaker, which comprises a shell, vacuum arc extinguishing mechanisms, an operating mechanism and a permanent-magnetic driving device, wherein each vacuum arc extinguishing mechanism comprises a vacuum arc extinguishing chamber and an insulated pull rod for driving a movable contact in the vacuum arc extinguishing chamber todo linear motion; the operating mechanism comprises a driving main shaft and an output crank arm arranged on the driving main shaft; the permanent-magnetic driving device comprises a body and a driving rod in linear motion; the outer surface of the end edge wall on one side of the shell is provided with a driving mechanism accommodating chamber, and the permanent-magnetic driving device is arranged in the driving mechanism accommodating chamber; and the driving rod drives the driving main shaft so as to drive each insulated pull rod to do linear reciprocating motion through the output crank arm. The permanent-magnetic high-voltage vacuum circuit breaker has the advantages of simplified structure, few parts, high reliability and easy repair of the permanent-magnetic driving device.

Description

technical field [0001] The invention belongs to the technical field of high-voltage switch structure design, and in particular relates to a permanent magnet high-voltage vacuum circuit breaker. Background technique [0002] In the power network, there are many users who have high requirements on the reliability of power supply, such as coal mines and oil refineries. Once a power outage occurs in these units, it will bring significant economic losses or even casualties to the unit. Therefore, the power supply in these units In the system, both the main power supply and the backup power supply are required. When the main power supply fails, the backup power supply must be put into power immediately to restore the power supply. In order to achieve this purpose, it is necessary to manually switch between the main power supply and the backup power supply through a dual power supply switching mechanism. or switch automatically. [0003] The traditional dual power switching mechan...

AI Technical Summary

Problems solved by technology

[0003] The traditional dual power switching mechanism uses two high-voltage switch cabinets plus a set of extremely complicated electrical interlocking devices to prevent parallel operation of the two circuits

This kind of dual power supply device has the following three major defects: (1) Unreliable locking: At present, the reliability of electrical interlocking is too low, and it is strictly forbidden to use it. There is no unified design specification standard for mechanical interlocking devices, and it can only be designed and modified by each locality.

(2) The operation is complicated, and it is easy to jam, causing electric accidents; (3) The investment is large, and two switch cabinets need to be purchased, and then the locking device is designed, and then refitted to the switch cabinet

The advantage of the spring operating mechanism is that it does not require a high-power DC power supply, the motor power is small, AC and DC are dual-purpose, and it is suitable for AC operation; its disadvantage is that the structure is more complicated, the number of parts is large (about 200), and it requires high machining accuracy. The manufacturing process is complicated, the cost is high, and the reliability of the mechanism is not easy to guarantee

The advantages of the electromagnetic operating mechanism are simple structure, small number of parts (about 120), reliable operation, and low manufacturing cost, but its disadvantages are that the power consumed by the closing coil is too large, the pressure of the contacts is small, and the mechanism Heavy, long action time requires users to equip expensive battery packs, etc.

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