Vacuum circuit breaker type ring main unit

Abstract

The invention relates to a vacuum circuit breaker type ring main unit, comprising a cabinet body, wherein a load switch and an earthing switch are arranged in the cabinet body, and a circuit breaker and a current transformer are connected in sequence between the load switch and the earthing switch; and the top part of the cabinet body is fixed with a secondary compartment. The vacuum circuit breaker type ring main unit is provided with the circuit breaker in the cabinet body, when a fault current occurs in the line, the circuit breaker automatically cuts off to protect the equipment, and the switching on of the circuit breaker can be realized remotely, thereby realizing the distribution network automation; and the top part of the cabinet body is provided with the secondary compartment, and a circuit breaker cabinet and an isolation cabinet can be assembled into one cabinet, thereby reducing commissioning cost of the equipment.

Description

technical field [0001] The invention relates to transmission and distribution electrical equipment, in particular to a vacuum circuit breaker type ring network cabinet. Background technique [0002] In order to improve the reliability of power supply and enable users to obtain power from two directions, the power supply network is usually connected into a ring. This power supply method is called ring network power supply for short. [0003] Ring network cabinets are generally divided into two types: air insulation and SF6 insulation. They are used for switching load currents, breaking short-circuit currents and transformer no-load currents, and charging currents for overhead lines and cable lines at a certain distance. They play a role in control and protection. Important switchgear for grid power supply and terminal power supply. In industrial and mining enterprises, residential quarters, ports and high-rise buildings and other AC 10kV power distribution systems, the high-...

AI Technical Summary

Problems solved by technology

[0004] This conventional ring network cabinet has the following disadvantages: 1. The equipment can only rely on the load switch to break the load current. When a fault current occurs, it relies on the fuse in the overcurrent fuse to break the circuit, thereby protecting the equipment.

However, when the equipment is put into operation again, maintenance personnel need to go to the site to replace the fuse in the fuse, which increases the labor cost and cannot realize the automation of the distribution network; 2. The rated breaking current of the conventional ring network cabinet is 630 / 1250A. With the development of industry and the improvement of living standards, the rated current of 630 / 1250A cannot meet the power demand of branch circuits at all. To meet the demand, branch lines can only be added, which leads to a significant increase in equipment costs; 3. When two lines appear in the line A connection cabinet is required for busbars with a section or more, and the current connection cabinet is generally composed of two cabinets, an isolation cabinet and a circuit breaker cabinet, which increases the cost of equipment operation

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