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Nested excitation protection device for breaking conductor and melt

A protection device and nested technology, which is applied in emergency protection devices, electrical components, circuits, etc., can solve the problems of large external influence on insulation establishment, lack of sealing of conductor fractures, and degradation of insulation performance, so as to improve breaking capacity and arc extinguishing Ability, enhance arc extinguishing ability, effect of reducing arc extinguishing pressure

Pending Publication Date: 2021-10-22
XIAN ZHONGRONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The conductor is exposed to the air before and after breaking. After the conductor is interrupted under the condition of large fault current, if the melt fuses too quickly, the arc re-ignition is likely to occur at the conductor fracture
[0007] 2. After breaking, the conductor fracture lacks protection, and it is easy to be polluted by leaked gunpowder gas or substances burned by the arc, resulting in a decrease in insulation performance
[0008] 3. The conductor fracture lacks sealing, and the insulation is completely dependent on the air medium. The insulation establishment is greatly affected by the outside world. In high temperature, high humidity, and high altitude areas, it may not be able to effectively cooperate with the arc extinguishing melt, resulting in breaking failure

Method used

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  • Nested excitation protection device for breaking conductor and melt
  • Nested excitation protection device for breaking conductor and melt
  • Nested excitation protection device for breaking conductor and melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] see figure 1 , the shell, including the upper shell 204 and the lower shell 212 that are sealed butted, and the lower shell 212 is sealed by the bottom cover 214 . The shell material is insulating material. The upper casing and the lower casing are molded by injection molding, and may also be molded by other molding methods. A cavity is opened in the upper shell and the lower shell and passes through the upper and lower ends of the upper and lower shells. The conductor 207 is passed between the upper casing and the lower casing, and its two ends are located outside the casing and can be connected to an external circuit. The conductor 207 in the casing passes through the cavity opened in the upper casing and the lower casing .

[0046] In the cavity of the upper casing on the side of the conductor 207, an impact device 203 and an excitation source 201 are sequentially arranged. In this embodiment, the excitation source is an electronic ignition device. The impact dev...

Embodiment 2

[0056] The main difference between this embodiment and Embodiment 1 lies in the change of the structure of the nesting protection device at the melt, and the change of the slope of the contact surface between the lower shell and the upper shell. In Example 1, the nesting protection device at the melt is arranged symmetrically from left to right. In Example 2, the nesting protection device at the melt is set up and down. For details, see Figure 5 . The nesting protection device at the melt, including the upper nesting protection block 309 and the lower nesting protection block 310 located on the upper and lower sides of the melt, which are nested oppositely; The melt portion is located in the cavity 312a. The upper nesting protection block 309 is located at the step in the cavity 312a, and has a groove 309a on it, and the shape of the inner wall of the groove is consistent with the shape of the inner wall of the cavity 312a. A vertical groove 309b is formed at the center of ...

Embodiment 3

[0065] On the basis of the above-mentioned embodiment 1 and embodiment 2, the nesting protection device on the conductor can be removed. Since the impact device uses insulating material, the impact end surface of the impact device will cover the pre-fracture of the conductor when it impacts the conductor, and drive it into the melting point. In the nested protection device at the pre-fracture of the body, insulation can also be achieved to prevent arc re-ignition.

[0066] Its arc extinguishing principle is the same as that in Embodiment 1.

[0067] In the above-mentioned embodiments, the sealing design is adopted between the upper shell, the lower shell and the bottom cover, which can not only prevent the fracture from being polluted by foreign objects, but also prevent the high-temperature arc from blowing out of the shell and damaging the surrounding devices.

[0068] The nested protective device and auxiliary arc extinguishing structure can be made of materials that genera...

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PUM

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Abstract

The invention provides a nested excitation protection device for breaking a conductor and a melt. The device comprises a shell, an excitation source, an impact device, a conductor and a melt connected with the conductor in parallel, wherein a nested protection device is arranged at a melt pre-fracture position below a conductor pre-fracture position, a containing cavity for a conductor broken part to fall in is formed in the nested protection device at the melt pre-fracture position, the containing cavity is matched with the conductor broken part in shape, and under the driving of the impact device, the conductor broken part can push the nested protection device to break the melt. According to the excitation protection device provided by the invention, the nested protection device is arranged, so that re-combustion of an electric arc at a conductor fracture can be prevented while the arc extinguishing capability is improved.

Description

technical field [0001] The invention relates to the fields of power control and electric vehicles, in particular to an excitation protection device for disconnecting a control circuit when a fault occurs. Background technique [0002] At present, in addition to the traditional thermal fuse, there is already a protection structure that quickly cuts off the circuit, that is, the excitation fuse, and its application range is gradually expanding. The traditional fuse is a protective device that uses the heat accumulation effect of the current to make the current sensing point (narrow neck) set by the melt melt and disconnect and extinguish the arc within a certain period of time. The excitation fuse is a fast protection device that cuts off the conductor by mechanical force in a short time and forms a physical fracture in the circuit. [0003] The advantages of traditional fuses are maturity and stability, high breaking limit, and strong arc extinguishing ability. The disadvant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H85/38H01H85/055
CPCH01H85/38H01H85/055
Inventor 戈西斌段少波王欣
Owner XIAN ZHONGRONG ELECTRIC CO LTD