CN216749794U

CN216749794U - Fuse cylinder

Info

Publication number: CN216749794U
Application number: CN202123431877.0U
Authority: CN
Inventors: 林坚; 梁景璇; 蔡智伟
Original assignee: Xiamen Huadian Switchgear Co Ltd
Current assignee: Xiamen Huadian Switchgear Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-06-14
Anticipated expiration: 2031-12-30

Abstract

The utility model provides a fuse tube is applied to combination formula switchgear, and the gas in this combination formula switchgear's the gas tank is the air, this fuse tube have be used for with the inlet wire end that combination formula switchgear's load switch is connected, inlet wire end department is provided with supporting insulator, the electric current warp of inlet wire end department the direction of height of supporting insulator climbs to the insulating casing's of fuse tube surface, this supporting insulator's highly more than or equal to 29 mm. This openly through add supporting insulator on the fuse section of thick bamboo to increased creepage distance, and then improved insulating properties, can be suitable for the air circumstance that insulating properties is relatively weak.

Description

Fuse tube

Technical Field

The disclosure relates to the field of power transmission and distribution equipment of a power system, in particular to a fuse tube.

Background

In general, a fuse tube is provided in a combined switchgear of a load switch and a fuse, which accommodates and protects a fuse wire provided inside the fuse tube, and both ends of the fuse wire are connected to a lead-in terminal and a lead-out terminal of the fuse tube, respectively, and to the outside of the fuse tube. The fuse cartridge passes through a cabinet wall of the switchgear assembly to extend to the outside so that the fuse can be accessed from the outside of the switchgear assembly.

In general, a combination type switchgear is filled with sulfur hexafluoride (SF6) gas having an insulation property to achieve a good insulation property. However, in the combined switch device without SF6, since the insulation performance of dry air or substitute gas of SF6 is low, such as too small creepage distance, creepage and insulation breakdown along the surface are caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of lower insulating properties of fuse cartridges existing in the related art, the present disclosure provides a fuse cartridge capable of increasing insulating properties.

The utility model provides a fuse tube is applied to combination formula switchgear, the gas in combination formula switchgear's the gas tank is the air, fuse tube have be used for with the inlet wire end that combination formula switchgear's load switch connects, inlet wire end department is provided with supporting insulator, the electric current warp of inlet wire end department supporting insulator's direction of height crawls to fuse tube's insulating casing's surface, supporting insulator's high more than or equal to 29 mm.

Optionally, the creepage distance of the current at the incoming line end is at least the sum of the height of the supporting insulator and the length from the supporting insulator to the front plate of the combined switch device.

Optionally, the supporting insulator includes an insulator body and side wings extending from the insulator body to both sides, the side wings extend along an axial direction of the fuse holder, and a creepage distance of the current is a sum of a height of the insulator body, a length of the side wings, and a length from the insulator body to the front plate.

Optionally, the support insulator is of a hollow structure, a containing cavity is formed inside the support insulator, the connecting conductor is fixed in the containing cavity through a screw thread, one end part of the connecting conductor, which is close to the fuse tube, is connected with the high-voltage conducting plate, and the high-voltage conducting plate is connected with the internal conductor of the fuse tube.

Optionally, a gasket is sleeved on the periphery of one end of the high-voltage conducting plate facing the inside of the fuse tube, and the gasket is connected with the high-voltage conducting plate and a shielding net arranged in the fuse tube.

Optionally, a sealing ring is arranged between the high-voltage conducting plate and the insulating shell of the fuse cylinder, the sealing ring is located above the gasket and used for preventing external gas from entering the gas box through the fuse cylinder and keeping the difference between the internal gas pressure and the external gas pressure of the gas box.

Optionally, the high-voltage conductive plate has a groove, and the connection conductor is inserted into the groove near an end of the fuse tube to realize connection.

Optionally, a shielding ring is disposed in the accommodating cavity, and the shielding ring wraps the connecting conductor and the tip portion of the high-voltage conductive plate.

Optionally, the supporting insulator with the one end that the fuse section of thick bamboo is fixed is provided with annular arch, annular arch card is gone into fix a position in the fuse section of thick bamboo the other end of supporting insulator is locked fixedly through mounting nut.

Optionally, an annular notch is formed in one side, close to the outer surface of the support insulator, of the annular protrusion, an annular sealing element is arranged in the annular notch, and the annular sealing element seals the mounting surface between the support insulator and the fuse tube.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the utility model provides a fuse tube is applied to combination formula switchgear, and the gas in this combination formula switchgear's the gas tank is the air, this fuse tube have be used for with the inlet wire end that combination formula switchgear's load switch is connected, inlet wire end department is provided with supporting insulator, the electric current warp of inlet wire end department the direction of height of supporting insulator climbs to the insulating casing's of fuse tube surface, this supporting insulator's highly more than or equal to 29 mm. This is disclosed through add support insulator on the fuse section of thick bamboo, and support insulator's highly more than or equal to 29mm to increased creepage distance, and then improved insulating properties, can be suitable for the air circumstance that insulating properties is relatively weak.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure_，And together with the description serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of a fuse cartridge shown in accordance with an exemplary embodiment.

Fig. 2 is a partially enlarged view of region a in fig. 1.

Detailed Description

For further explanation of the principles and construction of the present disclosure, reference will now be made in detail to the preferred embodiments of the present disclosure, which are illustrated in the accompanying drawings.

The present disclosure provides a fuse cartridge 50 for use in a combined switching device, in particular a combined switching device of a load switch and a fuse. The combined switch equipment comprises a cabinet body, a load switch, a grounding switch and a fuse tube. The cabinet includes a plurality of function compartments such as a gas tank, a low pressure compartment, a mechanism compartment, and a cable compartment. The fuse tube 50 is installed in the gas box by welding, and the gas filled in the gas box is air. The fuse tube 50 is connected to the load switch and the ground switch via a wire inlet terminal, and is connected to a circuit inside the cable chamber via a wire outlet terminal.

Specifically, a support insulator 52 is provided at the wire inlet end 51 of the fuse tube 50. The top of the supporting insulator 52 is provided with a connecting part 53 connected with the load switch 10, and the current at the connecting part 53 climbs to the surface of the insulating shell of the fuse tube 50 along the height direction of the supporting insulator 52. Due to the arrangement of the supporting insulator 52, the creepage distance of current is increased, and the insulating property of the fuse tube 50 is enhanced, so that the fuse tube can be applied to air under normal air pressure.

The outer circumference of the connection portion 53 at the top of the support insulator 52 is provided with a shield cover to uniform an electric field. Similarly, a shielding can is also provided at the outlet end of the support insulator 52 to provide a uniform electric field.

The supporting insulator 52 is made of an insulating material on the outer peripheral surface thereof, and has a hollow structure inside thereof to form an accommodating cavity. The insulating surface of the fuse cylinder 50 breaks a fracture at which the support insulator 52 is installed. The end of the support insulator 52 fixed to the fuse tube 50 is provided with an annular protrusion 521, and the annular protrusion 521 is clamped into the fracture of the fuse tube 50 for positioning. The other end of the support insulator 52 is fastened and fixed by a mounting nut 523.

An annular notch is formed in one side of the annular protrusion 521 close to the outer surface of the support insulator 52, an annular sealing member 54 is arranged in the annular notch, and the annular sealing member 54 surrounds and seals a mounting surface between the support insulator 52 and the fuse holder 50 to prevent current from flowing out of the mounting surface.

The connection conductor 59 is inserted into the receiving cavity of the support insulator 52 and fixed therein by means of a screw thread, and the mounting nut 523 locks the connection conductor 59 at the top. The connection conductor 59 has one end near the fuse tube 50 connected to the high-voltage conductive plate 57 and the other end connected to the load switch 10 or the ground switch. The high-voltage conductive plate 57 is connected to the internal conductor of the fuse tube, and thus the connection conductor 59 is connected to the internal conductor of the fuse tube 50 through the high-voltage conductive plate 57. The high-voltage conductive plate 57 has a groove, and an end of the connection conductor 59 near the fuse tube 50 has a projection inserted into the groove to achieve connection. The high-voltage conductive plate 57 has one end inserted into the receiving cavity of the support insulator 52 and the other end protruding from the receiving cavity and extending into the fuse tube 50 to be connected to the electrical conductor inside the fuse tube 50, so that the connection conductor 59 establishes a connection with the electrical conductor inside the fuse tube 50. The high voltage conductive plate 57 is substantially U-shaped.

The periphery of one end of the high-voltage conductive plate 57 facing the inside of the fuse tube 50 is sleeved with a ring of gasket 56, and the gasket 56 is connected with the high-voltage conductive plate 57 and the shielding net arranged in the fuse tube 50, so that the shielding net arranged in the fuse tube 50 is tightly connected with the high-voltage conductive plate 57, and the overall partial discharge value of the fuse tube 50 meets the standard requirement.

A sealing ring 55 is arranged between the high-voltage conductive plate 57 and the outer shell 50 of the fuse cylinder, and the sealing ring 55 surrounds the high-voltage conductive plate 57 for one circle and is used for blocking external gas from entering the gas box through the fuse cylinder 50 and maintaining the difference between the internal gas pressure and the external gas pressure of the gas box. The seal ring 55 is located above a gasket 56.

A shielding ring 58 is further disposed in the receiving cavity of the supporting insulator 52, and the shielding ring 58 wraps the connection conductor 59 and the tip portions of the high voltage conductive plates 57, i.e., wraps the protrusions of the connection conductor 59, the tip portions of the screw threads, and the protrusions of both ends of the groove of the high voltage conductive plates 57, thereby equalizing the electric field and improving the insulation performance.

The creepage distance for the current at the connection 53 at the top of the support insulator 52 to reach the front plate of the gas box is at least the sum of the height of the support insulator 52 and the length from the support insulator 52 to the front plate. Thus, the current first climbs down the support insulator 52 from the top of the support insulator 52, then passes through the surface of the insulating housing of the fuse cartridge 50, and finally reaches the front plate of the gas box. Due to the fact that the supporting insulator 52 is arranged, the creepage distance of current is increased, the insulating property is improved, and the insulating level of the front plate under the air is greatly improved.

Wherein the height of the support insulator 52 is equal to or greater than 29mm to enable current to run down the outer surface of the support insulator 52 rather than directly from the top of the support insulator 52 to the surface of the fuse cylinder 50.

The support insulator 52 includes an insulator body 525 and a side wing 522 extending from the insulator body 525 to both sides, and the side wing 522 extends in the axial direction of the fuse tube 50. The length of the wings 522 may be substantially equal to the height of the support insulator. In this case, the creepage distance of the current is increased by providing the side wing 522, and the creepage distance of the current to the front plate is the sum of the height of the insulator body 525, the length of the side wing 522, and the length from the insulator body 525 to the front plate, as indicated by the broken line L in fig. 2.

The supporting insulator 52 is added on the fuse tube 50, so that the creepage distance is increased, the problems of insulation breakdown and the like are effectively avoided, and the fuse tube can be suitable for an air environment with weaker insulation performance.

The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the scope of the present disclosure, but rather is intended to cover all equivalent structural changes made by applying the teachings of the present disclosure to the accompanying drawings.

Claims

1. The utility model provides a fuse tube, its characterized in that is applied to combination formula switchgear, the gas in combination formula switchgear's the gas tank is the air, fuse tube have be used for with the inlet wire end that combination formula switchgear's load switch connects, inlet wire end department is provided with supporting insulator, the electric current warp of inlet wire end department the direction of height of supporting insulator climbs to fuse tube's insulating casing's surface, supporting insulator's high more than or equal to 29 mm.

2. The fuse cartridge of claim 1, wherein a creepage distance for current at the incoming line end is at least a sum of a height of the support insulator and a length from the support insulator to a front plate of the switchgear assembly.

3. The fuse cylinder according to claim 2, wherein the supporting insulator comprises an insulator body and side wings extending from the insulator body to both sides, the side wings extend in the axial direction of the fuse cylinder, and the creepage distance of the current is the sum of the height of the insulator body, the length of the side wings and the length from the insulator body to the front plate.

4. The fuse cylinder according to claim 1, 2 or 3, wherein the supporting insulator is hollow and has a receiving cavity formed therein, a connecting conductor is fixed in the receiving cavity by a screw thread, and the connecting conductor is connected to a high voltage conductive plate near an end of the fuse cylinder, and the high voltage conductive plate is connected to an internal conductor of the fuse cylinder.

5. The fuse cylinder of claim 4, wherein a gasket is provided around the periphery of an end of the high voltage conductive plate facing the interior of the fuse cylinder, the gasket connecting the high voltage conductive plate and a shielding mesh built into the fuse cylinder.

6. The fuse tube as recited in claim 5, wherein a sealing ring is disposed between the high voltage conductive plate and the insulating housing of the fuse tube, the sealing ring is located above the gasket to block outside air from entering the gas box through the fuse tube and maintain a difference between an inside air pressure and an outside air pressure of the gas box.

7. The fuse cylinder according to claim 4, wherein the high-voltage conductive plate has a groove, and the connection conductor is inserted into the groove near an end of the fuse cylinder to make a connection.

8. The fuse cartridge of claim 4, wherein a shield ring is disposed within the receiving cavity, the shield ring surrounding the connection conductor and a tip portion of the high voltage conductive plate.

9. The fuse tube of claim 1, wherein an annular protrusion is arranged at one end of the supporting insulator, which is fixed to the fuse tube, the annular protrusion is clamped into the fuse tube for positioning, and the other end of the supporting insulator is locked and fixed through a mounting nut.

10. The fuse tube of claim 9, wherein an annular notch is formed in a side of the annular protrusion adjacent to the outer surface of the support insulator, and an annular seal is disposed in the annular notch and seals a mounting surface between the support insulator and the fuse tube.