Permanent magnet type dual electric power conversion switch

Abstract

The invention discloses a permanent-magnet type duplicate-supply transfer switch which comprises a vacuum circuit breaker main body and a duplicate-supply transfer device; the vacuum circuit breaker main body comprises three vacuum arc-extinguishing mechanisms respectively provided with moving contacts and fixed contacts and an operating mechanism used for driving the moving contacts to do closing and opening actions; the duplicate-supply transfer device comprises three main-power incoming posts, three standby-power incoming posts, three isolation knives which can carry out the switchover between the main-power wire-incoming posts and the corresponding standby-power wire-incoming posts and a driving mechanism which provides the power for the isolation knives; each isolation knife is electrically connected with one corresponding fixed contact; the moving contacts in the vacuum arc-extinguishing mechanisms are respectively electrically connected with a wire-outgoing post; and the operating mechanism is a permanent-magnet operating mechanism. The invention has the advantages of simpler structure, less trouble sources and higher reliability.

Description

Technical field [0001] The invention relates to the technical field of high-voltage switch structure design, in particular to a permanent-magnet type dual power conversion switch. Background technique [0002] In the power network, many users have high requirements for power supply reliability, such as coal mines and oil refineries. Once a power outage occurs in these units, it will cause major economic losses and even casualties. Therefore, power supply in these units In the system, it is necessary to have a main power supply and a backup power supply. When the main power supply fails, the backup power supply must be immediately turned on to restore the power supply. In order to achieve this purpose, a dual power supply switching mechanism is required to manually switch between the main power supply and the backup power supply. Or switch automatically. [0003] The traditional dual power supply switching mechanism uses two high-voltage switch cabinets plus a set of extremely comp...

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 relatively complicated, the number of parts is large (about 200), and high processing accuracy is required. , 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 It is bulky and takes a long time to operate, requiring users to equip expensive battery packs, etc.

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