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High-speed opening operation mechanism of middle-and-low-voltage direct-current circuit breaker

A low-voltage DC, operating mechanism technology, applied in the direction of protection switch operation/release mechanism, etc., can solve the problems of breaking capacity reaching the limit, arc extinguishing difficulty, reliability to be improved, etc., to achieve short mechanical delay time and fast initial movement speed. Effect

Active Publication Date: 2012-07-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the spring operating mechanism as an example, its structure is complex, its reliability needs to be improved, and it is not easy to control
The existing mechanical switches act slowly, and the peak value of the short-circuit current has been reached when the short-circuit current is broken, it is difficult to extinguish the arc, and the breaking capacity has reached the limit

Method used

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  • High-speed opening operation mechanism of middle-and-low-voltage direct-current circuit breaker
  • High-speed opening operation mechanism of middle-and-low-voltage direct-current circuit breaker
  • High-speed opening operation mechanism of middle-and-low-voltage direct-current circuit breaker

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Embodiment Construction

[0017] The present invention is described in further detail below in conjunction with accompanying drawing:

[0018] see figure 1 , a high-speed opening operating mechanism of a medium-low voltage DC circuit breaker, including a moving contact and a static contact, the moving contact is fixed on the lower busbar through a first rotating shaft, and the static contact is fixed on the upper busbar through screws; When the circuit breaker is in the closing state, the upper busbar, the static contact, the moving contact and the lower busbar form a conductive circuit. The closing holding spring and the closing holding top block are installed in the horizontal limit sleeve, and the horizontal limit sleeve is fixed on the frame of the circuit breaker. The opening push rod, repulsion disk, coil and charge and discharge circuit are combined into an electromagnetic repulsion mechanism; around the opening push rod, there is also a return spring on the left side of the repulsion disk; the...

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Abstract

The invention relates to a high-speed opening operation mechanism of a middle-and-low-voltage direct-current circuit breaker, which is particularly suitable to be applied to high-speed direct-current circuit breakers with high requirements on short-circuit breaking capacity. The operation mechanism comprises a moving contact, a fixed contact, a closing retaining device and an electromagnetic repulsion mechanism, wherein the closing retaining device comprises a closing retaining spring, a horizontal limit sleeve and a closing retaining top-block; and the electromagnetic repulsion mechanism comprises an opening push-rod, a reset spring, a repulsion disc, a coil, a charge and discharge circuit and a controller. The invention provides a high-speed opening operation mechanism of a middle-and-low-voltage direct-current circuit breaker, which is simple in structure, easy to operate, and quick in opening speed; and by using the operation mechanism, the on-off speed of the direct-current circuit breaker can be improved, the dead time of an electric arc can be shortened, the ablation of the contacts is reduced, and a situation that the electric arc enters into an arc extinguish chamber as soon as possible and then is extinguished quickly is facilitated, thereby improving the on-off performance of the direct-current circuit breaker.

Description

Technical field: [0001] The invention belongs to the technical field of direct current circuit breakers, and relates to a high-speed opening operating mechanism of medium and low voltage direct current circuit breakers. Background technique: [0002] Due to the unique advantages of the DC power supply system, people's research on the DC system has never stopped, and at the same time, the DC power supply system is more and more closely related to people's daily life. At present, DC power supply systems are used in many important industries such as urban trolleybuses, subways, solar power generation, smelting, chemicals, rolling materials, ship power, mining, etc. Among them, as the key equipment of the DC power supply system, the DC circuit breaker has the protection function of reliably cutting off the fault current of the DC circuit, which is the guarantee for the safe operation of the DC power supply system. [0003] Due to the short-circuit current of DC power supply sys...

Claims

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Application Information

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IPC IPC(8): H01H71/68
Inventor 吴翊杨飞董得龙荣命哲纽春萍马瑞光
Owner XI AN JIAOTONG UNIV
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