Current-limiting vacuum circuit breaker ring main unit

Abstract

The invention relates to a current-limiting vacuum circuit breaker ring main unit, which comprises a cabinet body, wherein solid-sealed polar columns, vacuum arc extinguishing chambers arranged in the solid-sealed polar columns, and current-limiting permanent magnet operating mechanisms are arranged inside the cabinet body; each current-limiting permanent magnet operating mechanism comprises a transmission rod, a thrust plate, an upper coil and a switching on-off mechanism; and when in operation, each switching on-off mechanism drives the corresponding transmission rod to move, and each driving rod drives a movable conductive rod of the corresponding vacuum arc extinguishing chamber to complete switching on-off actions. Thus, the vacuum arc extinguishing chambers can disconnect short-circuit fault currents within 2 ms, and can recover grid power supply timely and effectively, identify grid fault properties by utilizing the reclosing function for recovering grid power supply, the disconnected short-circuit fault currents are high and can be reused, and vacuum circuit breakers have the functions of normal switching on and off of load current, overload current and short-circuit current as well as reclosing, thus the technical difficulties that the ring main unit needs to disconnect the short-circuit fault currents timely and effectively, and needs to recover grid power supply timely and effectively.

Description

technical field [0001] The invention relates to the technical field of ring network cabinets, in particular to a ring network cabinet for a current-limiting vacuum circuit breaker. Background technique [0002] With the development of the domestic economy, the demand for the capacity of the ring network power supply system continues to increase, and the number of ring network cabinets used in the power grid is also increasing. This mainly depends on the outstanding advantages of the ring network cabinet, which has a simple and compact structure, Small size, flexible operation, reliable interlocking, and convenient expansion of cabinet type, etc., are suitable for switching stations, box-type substations, residential quarters, industrial and mining enterprises, large shopping malls, airports, subways, railways, chemical industries, etc. User requirements for different technical solutions. However, as the capacity of the ring network power supply system continues to increase,...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a current-limiting vacuum circuit breaker ring main unit to solve the technical problem that the vacuum circuit breaker cannot break the short-circuit fault current within 2 ms in the prior art. It also solves the technical problem that the ring main unit must timely and effectively break the short-circuit fault current and restore the grid power supply in a timely and effective manner.

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