CN101853756B - Handle of oil-immersed fuse used for American-type box substation - Google Patents

Abstract

The invention discloses a handle for an oil-immersed fuse of an American box-type substation, which can increase sealing performance and increase creepage distance. and two conductive rings and a mounting base arranged at intervals in the shell, the fuse-carrying part includes a handle and two contact posts respectively connected to both ends of the fuse part and one connected to the handle, the handle includes sequentially connected Connecting rod, cover, handle, sealing structure and sealing ring. The sealing structure is arranged on the connecting rod and close to one end of the cover. It is a cylinder extending radially from the surface of the connecting rod. The outer peripheral surface of the cylinder There is an annular groove in the upper radial direction; the diameter of the sealing structure matches the inner diameter of the base; the sealing ring is embedded in the groove of the sealing structure; the cross section of the connecting rod of the handle is It is circular, and its outer peripheral surface is radially protruded with multiple layers of umbrella ribs at intervals along the length direction.

Description

Handle on oil-immersed fuse for American box-type substation

technical field

The invention relates to a handle used on an oil-immersed fuse of an American box-type substation.

Background technique

According to the installation form, the fuses are divided into plug-in type and oil-immersed busbar type, and according to the installation environment medium, there are atmosphere, transformer oil, etc. Generally, plug-in fuses are inserted vertically and installed in the atmosphere. The installation size is required to be large, resulting in a large overall size of the transformer. The oil-immersed busbar fuse needs to be replaced when the transformer box is opened and the transformer oil is extracted. The replacement is troublesome, and the insulation of the transformer oil is lost or reduced. Oil-immersed transformer overload protection high-voltage fuse is suitable for overload protection of power transformers in American box-type transformers, and is a very important electrical component in American-style box-type transformers. The American box-type combined transformer requires that the high-voltage current-limiting fuse used must be oil-immersed and can be buried underground. Therefore, there are extremely high requirements on the oil tightness of the fuse. During long-term use, no oil is allowed inside the fuse, otherwise explosion and serious fire may occur when the fuse operates.

A fuse generally includes a base 1 , a fuse element 2 , a handle 3 and two contact posts 4 , as shown in FIG. 1 . The base 1 is used to support the fuse 2, the handle 3 and the two contact posts 4, and isolate the fuse 2 from oil. The handle 3 is usually used for installing, replacing and carrying the fuse 2 . The handle structure in the prior art (as shown in FIG. 2 ) includes a handle 31 , a sealing cover 32 and a connecting rod 33 . When the fuse is immersed in oil, since the base 1 is usually closed at one end, the sealing degree of the contact part between the handle 3 and the base 1 directly determines the oil-tight performance of the fuse. At present, the sealing performance of the fuse handle and the base contact part has not been well resolved, and most fuses have such safety hazards in the working process. In addition, the cross-section of the connecting rod 33 is cross-shaped. Although it can meet the operating strength, the structure limits the creepage distance of the fuse to the length L of the connecting rod, so there is a defect that the insulation distance cannot be lengthened.

Contents of the invention

The purpose of the present invention is to provide a handle for the oil-immersed fuse of the American box substation, which can not only improve the mechanical tensile strength and sealing performance of the handle, but also increase the creepage distance of the fuse part relative to the ground.

A technical solution to achieve the above purpose is: a handle for an oil-immersed fuse of an American box-type substation, the fuse includes a cylindrical base, a fuse-carrying element and a fuse, the base includes a shell and Two conductive rings and a mounting base are arranged at intervals in the housing. The fuse-carrying element includes a handle and two contact posts respectively connected to both ends of the fuse element and one connected to the handle. The handle includes a connecting rod, Cover, handle, sealing structure and sealing ring. The sealing structure is arranged on the connecting rod and close to one end of the cover. It is a cylinder extending radially from the surface of the connecting rod. An annular groove is provided; the diameter of the sealing structure matches the inner diameter of the base; the sealing ring is embedded in the groove of the sealing structure; the cross section of the connecting rod of the handle is circular, Its outer peripheral surface is radially protruded with multiple layers of umbrella ribs at intervals along the length direction.

In the above-mentioned handle on the oil-immersed fuse for an American-style box-type substation, the distances between the multi-layer umbrella ribs are the same, and the diameters of each layer of umbrella ribs are also equal.

The above-mentioned handle on the oil-immersed fuse used in the American box-type substation, wherein, the handle is made of unsaturated polyester fiberglass composite insulating material.

The above-mentioned handle for the oil-immersed fuse of an American-style box-type substation, wherein the handle, cover, sealing structure and connecting rod are integrally formed by vacuum die-casting.

The technical scheme of the handle on the oil-immersed fuse of the American box transformer of the present invention adopts a connecting rod with a circular cross section, and on its outer peripheral surface, there are multiple layers protruding at equal intervals along the length direction. The umbrella edge not only improves the mechanical tensile strength of the handle, but also increases the creepage distance of the fuse relative to the ground; and adds a sealing structure and a sealing ring on the connecting rod, which can increase the sealing performance of the fuse, so it has the ability to meet Under the premise of operating strength and performance, the insulation strength of the handle of the fuse-carrying part is improved.

Description of drawings

Fig. 1 is a structural schematic diagram of an oil-immersed fuse used in an American box transformer in the prior art;

Fig. 2 is a structural schematic diagram of a handle on an oil-immersed fuse used in an American box transformer in the prior art;

Fig. 3 is a structural schematic diagram of a handle on an oil-immersed fuse for an American-style box-type substation according to the present invention.

Detailed ways

In order to better understand the technical solution of the present invention, it will be described in detail below through specific embodiments in conjunction with the accompanying drawings:

Please refer to Fig. 3, the handle 3 on the oil-immersed fuse for American box transformer of the present invention includes a handle 31, a cover 32, a connecting rod 33, a sealing structure 34 and a sealing ring 35, wherein,

The connecting rod 33 , the cover 32 and the handle 31 are sequentially connected; the cross section of the connecting rod 33 is circular, and its outer peripheral surface is radially provided with multi-layer umbrella ribs 330 at intervals along the length direction. The diameter D of each layer of umbrella ribs 330 is equal, and the spacing distance H is also equal. The umbrella rib 330 protruding from the outer peripheral surface of the connecting rod 33 can increase the relative creepage distance of the fuse; Extending to the cylinder, the outer peripheral surface of the cylinder is radially provided with an annular groove 340; the diameter of the sealing structure 34 matches the inner diameter of the base; the sealing ring 35 is embedded in the groove 340 of the sealing structure 4 Inside; increasing the sealing structure 34 and the sealing ring 35 can increase the sealing performance of the fuse,

The handle 3 on the oil-immersed fuse used in the American box substation of the present invention is made of unsaturated polyester fiberglass composite insulating material, and the handle 31, cover 32, connecting rod 33 and sealing structure 34 are integrally formed by vacuum die-casting.

The handle of the oil-immersed fuse used in the American box substation of the present invention has good insulation performance. Compared with the handle of the fuse-carrying part in the prior art, the cross section of the connecting rod of the handle is circular, and the outer circumference of the connecting rod is The umbrella edge is set on the surface, which not only improves the mechanical tensile strength of the handle, but also increases the creepage distance of the fuse to the ground and increases the sealing performance of the fuse, thereby improving the insulation strength of the fuse.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (4)

1. A handle on an oil-immersed fuse used in an American box-type transformer, the fuse includes a cylindrical base, a fuse-carrying element and a fuse, and the base includes a shell and two spacers arranged in the shell. Conductive ring and a mounting base, the fuse-carrying part includes a handle and two contact posts respectively connected to the two ends of the fuse part and one connected to the handle, the handle includes a connecting rod, a cover and a handle connected in sequence, its features In that, the handle also includes a sealing structure and a sealing ring, The sealing structure is arranged on the connecting rod and close to one end of the cover. It is a cylinder extending radially from the surface of the connecting rod, and an annular groove is radially provided on the outer peripheral surface of the cylinder; The diameter of the sealing structure matches the inner diameter of the base; The sealing ring is embedded in the groove of the sealing structure; The cross-section of the connecting rod of the handle is circular, and the outer peripheral surface of the handle protrudes radially with multiple layers of ribs at intervals along the length direction. 2. The handle on the oil-immersed fuse for an American-style box-type substation according to claim 1, wherein the distances between the multi-layer umbrella ribs are the same, and the diameters of each layer of umbrella ribs are also equal. 3. The handle on the oil-immersed fuse for American-style box-type transformer according to claim 1, characterized in that, the handle is made of unsaturated polyester fiberglass composite insulating material. 4. The handle on the oil-immersed fuse for an American-style box substation according to claim 3, wherein the handle, cover, connecting rod and sealing structure are integrally formed by vacuum die-casting.

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