KT universal high-voltage fuse

Abstract

The utility model relates to a KT universal high-voltage fuse, which comprises an installation joint and a conductive lead, and a K fuse and a T fuse are connected in series between the installation joint and the conductive lead. Alloy points are arranged on the T fuses, and the T fuses are mutually connected and fixed by the alloy points; the melting point of the alloy point is smaller than the melting point of the K melt, a tension spring is arranged at the joint of the K melt and the T fuse, and the other end of the tension spring is fixedly connected with the mounting connector. The diameter of the T fuse is larger than that of the K fuse. According to the invention, the melting temperature difference of the two fuses is fully utilized, the two fuses are ingeniously combined with time, and the K-type and T-type universal effect is realized.

Description

Technical Field

[0001] This application relates to the technical field of high-voltage fuses, and in particular to a KT universal high-voltage fuse. Background Technology

[0002] Currently, high-voltage fuses are electrical products used in drop-out fuses and are a key component of the entire system. They are primarily used to protect high-voltage transmission lines, power transformers, or other electrical equipment from damage caused by fault currents in the power system, thus providing protection.

[0003] Around the 1950s, high-voltage fuses were used without distinction between fast and slow speeds. At that time, power system failures were frequent, causing significant damage to electrical equipment. With rapid industrial development, the high-voltage fuses used today have improved, and they have been categorized for different applications. They are mainly divided into two types: K-type (fast) and T-type (slow). K-type high-voltage fuses are known as fast-speed fuses and are typically used in higher voltage power systems, such as transmission lines and substations. T-type high-voltage fuses are known as slow-speed fuses and are mainly used in medium-voltage or lower voltage power systems, such as power distribution systems in industrial and commercial buildings.

[0004] However, in actual use, using the wrong type, such as K or T, will cause equipment malfunctions and potentially lead to safety accidents. Utility Model Content

[0005] To address the aforementioned technical issues, this application provides a KT universal high-voltage fuse, which fully utilizes the melting temperature difference between the two types of fuses and cleverly combines the two with time, achieving the effect of being universal for both K and T types.

[0006] The technical solution for the KT universal high-voltage fuse provided in this application is as follows:

[0007] A general-purpose KT high-voltage fuse includes a mounting connector and a conductive lead. A K-type fusible element and a T-type fuse are connected in series between the mounting connector and the conductive lead. Alloy points are provided on the T-type fuse, and the alloy points connect and fix the T-type fuses to each other. The melting point of the alloy points is lower than the melting point of the K-type fusible element. A tension spring is provided at the connection between the K-type fusible element and the T-type fuse, and the other end of the tension spring is connected and fixed to the mounting connector. The diameter of the T-type fuse is larger than the diameter of the K-type fusible element.

[0008] Preferably, a clamping tube is provided at the connection between the T-fuse and the K-melt, and the T-fuse and the K-melt are respectively limited and fixed in their respective clamping tubes, and the T-fuse and the K-melt are interconnected and fixed through their respective clamping tubes.

[0009] Preferably, the tension spring is spirally wound around the outside of the T-fuse.

[0010] Preferably, the alloy point is externally sleeved with an insulating arc-extinguishing tube.

[0011] Preferably, the insulating arc-extinguishing tube is externally sleeved with an explosion-proof tube.

[0012] Preferably, the tension spring is formed with a limiting section outside the explosion-proof tube, and the limiting section limits the explosion-proof tube outside the T fuse.

[0013] Preferably, a pressing tube is arranged at the connection between the conductive lead wire and the K fuse, and the pressing tube tightly fixes the K fuse on the conductive lead wire.

[0014] Preferably, the K fuse and the T fuse are externally sleeved with a glass fiber arc-extinguishing tube.

[0015] In summary, the present application has at least one of the following beneficial technical effects:

[0016] The melting temperature difference of the two fuses is fully utilized, and the two fuses are ingeniously combined with time to realize the universal effect of K type and T type;

[0017] The arrangement of the insulating arc-extinguishing tube and the glass fiber arc-extinguishing tube realizes the effect of multi-section arc-extinguishing, ensures the safety of the K fuse and the T fuse when they are fused, and the arrangement of the explosion-proof tube further improves the explosion-proof level of the alloy point, so that the alloy point is more safe and reliable when it is fused.

[0018] The glass fiber arc-extinguishing tube 9 is made of epoxy glass fiber tape and is wound in a slope (about 45 degrees) direction, which fully utilizes the strength of the material, and the anti-explosion ability is about 1.6 times higher than that of the radial winding. The principle is that the cross section of the radial winding glass fiber is circular in diameter direction, and the cross section is changed to elliptical by using the slope winding, and the stress strength of the glass fiber is fully utilized, which ensures the arc-extinguishing performance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a partial structure sectional view of an embodiment of the present application;

[0020] Figure 2 is Figure 1 is an enlarged structure schematic view of A in FIG. 4.

[0021] Marked for explanation: 1, mounting joint; 2, conductive lead wire; 20, pressing tube; 3, K fuse; 4, T fuse; 40, alloy point; 5, tension spring; 50, limiting section; 6, pressing tube; 7, insulating arc-extinguishing tube; 8, explosion-proof tube; 9, glass fiber arc-extinguishing tube. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below with reference to the accompanying drawings.

[0023] The embodiment of the present application discloses a KT universal high-voltage fuse.

[0024] Referring to Figure 1 , Figure 2 , the KT universal high-voltage fuse comprises a mounting connector 1 and a conductive lead 2, and a K fuse body 3 and a T fuse 4 are connected in series between the mounting connector 1 and the conductive lead 2. One end of the T fuse 4 is fixedly connected with the mounting connector 1, and the other end of the T fuse 4 is fixedly connected with the K fuse body 3, and the end of the K fuse body 3, which is far away from the T fuse 4, is fixedly connected with the conductive lead 2.

[0025] As shown in Figure 1 , Figure 2 , an alloy point 40 is arranged on the T fuse 4, the alloy point 40 is made of lead-tin alloy, and the alloy point 40 is used for fixedly connecting the two sections of the T fuse 4. In the embodiment, the K fuse body 3 is made of nickel-chromium alloy, and the melting point of the alloy point 40 is lower than the melting point of the K fuse body 3. A tension spring 5 is arranged in parallel at the connection position of the K fuse body 3 and the T fuse 4, and the other end of the tension spring 5 is fixedly connected with the mounting connector 1. The tension spring 5 is spirally arranged outside the T fuse 4, and the T fuse 4 arranged in the inside of the spiral tension spring 5 is separated from the inner wall of the spiral tension spring 5. The tension spring 5 functions as a resistance wire.

[0026] When a small current (overload current) comes, the K fuse body 3 will not be fused because the melting point of the K fuse body 3 is high, and the alloy point 40 of the T fuse 4 will be fused because the melting point of the alloy point 40 is relatively low. With the continuous heating and heat accumulation, when the temperature reaches the melting point, the T fuse 4 is fused, so that the circuit can be timely cut off.

[0027] When a large current (short-circuit current) comes, the K fuse body 3 will be rapidly heated, and the diameter of the K fuse body 3 is relatively small, so that the K fuse body 3 is fused in milliseconds and cannot be rapidly cooled. With the rapid accumulation of the temperature, the K fuse body 3 is fused. Because the diameter of the T fuse 4 is larger than that of the K fuse body 3, the T fuse 4 has not reached the melting temperature, and the circuit is timely cut off by the K fuse body 3.

[0028] As shown in Figure 1 , Figure 2 , a compression tube 6 is arranged at the connection position of the T fuse 4 and the K fuse body 3, the compression tube 6 is made of metal conductive material, and in the embodiment, the compression tube 6 is a copper tube. The T fuse 4 and the K fuse body 3 are respectively compressed and fixed in the respective compression tubes 6, and the T fuse 4 and the K fuse body 3 are fixedly connected and conducted through the respective compression tubes 6, and the end of the tension spring 5 is also compressed and fixed in one of the compression tubes 6, and the two compression tubes 6 are fixed by welding.

[0029] As shown in Figure 1 , Figure 2As shown, an insulating arc-extinguishing tube 7, made of ceramic material, is coaxially sleeved around the alloy point 40. An explosion-proof tube 8, made of copper, is coaxially sleeved around the insulating arc-extinguishing tube 7. A limiting section 50, bent and formed on the tension spring 5, is located outside the explosion-proof tube 8. The limiting section 50 limits the explosion-proof tube 8 to the outside of the T-fuse 4, thereby restricting the sliding of the explosion-proof tube 8 along the length direction of the T-fuse 4.

[0030] like Figure 1 , Figure 2 As shown, a pressure tube 20 is provided at the connection between the conductive lead 2 and the K-melt 3, which presses and fixes the K-melt 3 onto the conductive lead 2. A fiberglass arc-extinguishing tube 9 is also sleeved around the K-melt 3 and the T-fuse 4. The fiberglass arc-extinguishing tube 9 is made of epoxy fiberglass tape and wound at an angle (approximately 45 degrees), fully utilizing the material's strength. Its explosion-proof capability is approximately 1.6 times higher than that of radially wound fiberglass. The principle is that the radially wound fiberglass cross-section is circular in the diameter direction, while the angled winding changes the cross-section to an elliptical shape, fully utilizing the fiberglass's strength and ensuring arc-extinguishing performance.

[0031] The implementation principle is as follows: When a small current (overload current) arrives, the K fuse 3 will not melt because its melting point is relatively high. However, the alloy point 40 of the T fuse 4 has a relatively low melting point. As time goes on, it continues to heat up and accumulates heat. When the melting point is reached, the T fuse 4 melts, thus cutting off the circuit in time.

[0032] When a large current (short-circuit current) arrives, fuse K3 will heat up rapidly. Because fuse K3 has a smaller diameter, its melting time is on the order of milliseconds. There is insufficient time for heat dissipation, and fuse K3 melts rapidly as temperature accumulates. Since the diameter of fuse T4 is larger than that of fuse K3, the circuit is promptly cut off by fuse K3 before fuse T4 reaches its melting point. This cleverly utilizes the difference in melting temperatures between the two types of fuses, combining them with time to achieve a versatile effect for both K-type and T-type fuses.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A KT general type high-voltage fuse comprising a mounting terminal (1) and a conductive lead (2), characterized in that: The installation joint (1) and the conductive lead (2) are connected in series with K melt (3) and T fuse (4); the T fuse (4) is provided with alloy point (40), the alloy point (40) is connected and fixed with each other, the melting point of alloy point (40) is less than the melting point of K melt (3), the connection of K melt (3) and T fuse (4) is provided with tension spring (5), the other end of tension spring (5) is connected and fixed with installation joint (1), the diameter of T fuse (4) is greater than the diameter of K melt (3).

2. The KT universal high voltage fuse according to claim 1, characterized in that: The connection of T fuse (4) and K melt (3) is provided with compression tube (6), T fuse (4) and K melt (3) are respectively limited and fixed in each compression tube (6), and T fuse (4) and K melt (3) are mutually conducted through each compression tube (6).

3. The KT universal high voltage fuse of claim 1, wherein: The tension spring (5) is spirally wound outside the T fuse (4).

4. The KT universal high voltage fuse of claim 1, wherein: The outside of the alloy point (40) is sleeved with an insulating arc-extinguishing tube (7).

5. The KT universal high voltage fuse of claim 4, wherein: The outside of the insulating arc-extinguishing tube (7) is sleeved with an explosion-proof tube (8).

6. The KT universal high voltage fuse of claim 5, wherein: The tension spring (5) is formed with a limiting section (50) outside the explosion-proof tube (8), and the limiting section (50) limits the explosion-proof tube (8) outside the T fuse (4).

7. The KT universal high voltage fuse of claim 1, wherein: The connection of the conductive lead (2) and the K melt (3) is provided with a compression tube (20), and the compression tube (20) compresses and fixes the K melt (3) on the conductive lead (2).

8. The KT universal high voltage fuse of claim 1, wherein: The K melt (3) and the T fuse (4) are externally sleeved with a glass fiber arc-extinguishing tube (9).

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