CN205846710U - A kind of protection device of fuse - Google Patents

Abstract

This utility model relates to the protection device of a kind of power domain, particularly relates to the protection device of a kind of fuse.Including a sleeve and fuse, fuse is installed in sleeve；Alloy melt, is built in fuse；Two blockings are individually fixed in the top and bottom of sleeve inner；First spring, connects fuse and the upper end of sleeve inner；Second spring, connects fuse and the lower end of sleeve inner；The temperature-detecting device being located in sleeve, in order to detect the temperature in sleeve；Two conductive clamps, contact with two blockings respectively；Upper lead-in wire, connecting line trackside；Lower lead-in wire, connects load-side；Also including a display lamp, display lamp connects lower lead-in wire, for the duty of indicating fuse.This utility model is easy to use, rational in infrastructure, good insulation preformance, and explosion-proof capabilities is strong, and the sleeve pipe used effectively prevent the danger of the voltage transformer short circuit caused in conventional fuse blast process in high-tension switch cabinet because powder body sputtering.

Description

A fuse protection device

technical field

The utility model relates to a protection device in the field of electric power, in particular to a protection device for a fuse.

Background technique

In the power generation, transmission, distribution, power conversion and consumption of the power system, the high-voltage switchgear is used to switch, control or protect the line. The core of the high-voltage switchgear is the fuse installed inside it, and the fuse is the simplest protection. Electric, which can protect electrical equipment from damage caused by overload current. Its structure includes melt, shell and support, etc. The inside of the fuse tube is filled with fine quartz sand, and there is a small part of the air chamber space. The melt is made of metal material with a low melting point, and is connected in series in the circuit to be protected. When overload occurs, the melt will heat up and melt quickly, cutting off the circuit to achieve the purpose of protection. However, due to the instability of the power grid and the uneven quality of the fuses, it is impossible to prevent the occurrence of accidents, especially in the overcurrent state of the fuse. The pile head is exposed, and there is a possibility of tip discharge, which may easily lead to breakdown and short circuit of the high-voltage switchgear, causing tripping.

Utility model content

Aiming at the above-mentioned problems existing in the current prior art, the utility model provides a protection device for a fuse.

The technical solution adopted by the utility model to solve technical problems is:

A fuse protection device applied in a high-voltage switchgear, the protection device includes a sleeve, and

a fuse mounted within the sleeve;

an alloy melt built into said fuse;

two plugs, the two plugs are respectively fixed at the upper end and the lower end inside the sleeve;

a first spring, the first spring is connected to the upper end of the fuse and the inside of the sleeve to press the fuse;

a second spring, the second spring connects the fuse and the lower end inside the sleeve to compress the fuse;

A temperature detection device, the temperature detection device is arranged in the sleeve and connected to the upper end and the lower end inside the sleeve to detect the temperature in the sleeve;

Two conductive clips, each of which is connected to the corresponding plug;

An upper lead wire is led out from the upper end inside the sleeve to connect the line side of the protection device;

a lower lead lead out from the lower end inside the sleeve to connect to the load side of the protective device;

An indicator light, which is connected to the lower lead wire and is used to indicate the working state of the fuse.

Preferably, the plug is a sealing rubber ring.

Preferably, the color of the indicator light changes with the magnitude of the current in the fuse.

Preferably, an alarm device is also included, the alarm device is connected to the lower lead wire, and is used for alarming when the temperature detection device detects that the temperature inside the sleeve exceeds a certain preset threshold.

Preferably, the alarm device can also alarm the current in the fuse, and when the current in the fuse reaches a preset threshold, the alarm device starts an alarm.

Preferably, internal threads are provided at the upper and lower ends of the sleeve and in contact with the plug for fixing the plug.

Preferably, a switch is further included, the switch is connected to the lower lead wire, and is used to cut off the operation of the fuse.

Preferably, said alloy melt is made of copper sheet.

Preferably, the sleeve is made of insulating material.

Preferably, the insulating material is epoxy resin and/or glass tube fiber.

Beneficial effects of the utility model: the utility model is convenient to use, reasonable in structure, good in insulation performance, and strong in explosion-proof capability. Risk of short circuit of voltage transformers.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

As shown in Figure 1, it is a protection device for a fuse 5 of the present utility model, which is applied in a high-voltage switch cabinet 13. The protection device includes a sleeve 4, a fuse 5, an alloy melt 11, a plug 2, a spring, A temperature detection device 9, a conductive clip, an upper lead 1, a lower lead 8, an alarm device 10 and an indicator light 6. The fuse 5 is installed in the sleeve 4, and an alloy melt 11 made of copper sheet is placed in the fuse 5. The two plugs 2 are respectively fixed on the upper and lower ends of the sleeve 4. In order to fasten the plugs 2, internal threads are provided at the upper and lower ends of the sleeve 4 and in contact with the plug 2, Wherein, the shape of the internal thread matches the shape of the plug 2 . Two conductive clips, any one of the conductive clips is in contact with one of the plugs 2 . Two springs, the first spring 3 connects the upper end of the fuse 5 and the inside of the sleeve 4; the second spring 7 connects the lower end of the fuse 5 and the inside of the sleeve 4, both springs press the fuse 5 and are easy to take out replace. The upper lead wire 1 connected to the line side is drawn out from the upper end inside the sleeve 4; the lower lead wire 8 connected to the load side is drawn out from the lower end inside the sleeve 4. In addition, a temperature detection device 9 for detecting the internal temperature of the sleeve 4 is also installed in the sleeve 4 , and the two ends of the temperature detection device 9 are respectively connected to the upper lead 1 and the lower lead 8 to detect the temperature in the sleeve 4 . It also includes an alarm device 10 connected to the lower lead wire 8 for alarming when the temperature detection device 9 detects that the temperature inside the sleeve 4 exceeds a certain preset threshold. The alarm device 10 can also alarm the current in the fuse 5 , and when the current in the fuse 5 reaches a preset threshold, the alarm device 10 starts an alarm.

In a preferred embodiment of the present invention, the above-mentioned plug 2 is a sealing rubber ring.

A preferred embodiment of the present utility model also includes an indicator light 6, the indicator light 6 is connected to the lower lead wire 8, and is used to indicate the working state of the fuse 5, and when the fuse 5 works normally, the color of the indicator light 6 changes with the The magnitude of the current in the fuse 5 changes. For example, when the current increases, the color of the indicator light 6 can gradually change from light yellow to deep red according to the level corresponding to the preset current and color.

A preferred embodiment of the present utility model also includes a switch 13, the switch 13 is connected to the lower lead wire 8, and is used to cut off the work of the fuse 5. When the fuse 5 needs to be taken out to replace it, the switch 13 can be cut off, thereby Safely remove fuse 5.

In a preferred embodiment of the present invention, the sleeve 4 is made of insulating material, and the insulating material is epoxy resin and/or glass tube fiber.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the implementation and protection scope of the present utility model. For those skilled in the art, they should be aware The solutions obtained by making equivalent replacements and obvious changes shall all be included in the protection scope of the present utility model.

Claims (10)

1. A protection device for a fuse, which is applied in a high-voltage switch cabinet, is characterized in that the protection device includes a sleeve, and a fuse mounted within the sleeve; an alloy melt built into said fuse; two plugs, the two plugs are respectively fixed at the upper end and the lower end inside the sleeve; a first spring, the first spring is connected to the upper end of the fuse and the inside of the sleeve to press the fuse; a second spring, the second spring connects the fuse and the lower end inside the sleeve to compress the fuse; A temperature detection device, the temperature detection device is arranged in the sleeve and connected to the upper end and the lower end inside the sleeve to detect the temperature in the sleeve; Two conductive clips, each of which is connected to the corresponding plug; An upper lead wire is led out from the upper end inside the sleeve to connect the line side of the protection device; a lower lead lead out from the lower end inside the sleeve to connect to the load side of the protective device; An indicator light, which is connected to the lower lead wire and is used to indicate the working state of the fuse. 2. The fuse protection device according to claim 1, wherein the plug is a sealing rubber ring. 3. The fuse protection device according to claim 1, wherein the color of the indicator light changes with the magnitude of the current in the fuse. 4. The fuse protection device according to claim 1, further comprising an alarm device connected to the lower lead wire for detecting that the temperature in the sleeve exceeds When a preset threshold is reached, an alarm is issued. 5. The fuse protection device according to claim 4, wherein the alarm device can also alarm the current in the fuse, and when the current in the fuse reaches a preset threshold , the alarm device activates the alarm. 6. The fuse protection device according to claim 1, characterized in that, internal threads are provided at the upper and lower ends of the sleeve and in contact with the plug to fix the seal. 7. The fuse protection device according to claim 1, further comprising a switch connected to the lower lead for cutting off the fuse. 8. The fuse protection device according to claim 1, wherein the alloy melt is made of copper sheet. 9. The fuse protection device according to claim 1, wherein the sleeve is made of insulating material. 10 . The fuse protection device according to claim 9 , wherein the insulating material is epoxy resin and/or glass tube fiber. 11 .