A 110kV oil-filled insulating bushing outdoor terminal

Abstract

The present invention relates to a 110kV oil-filled insulating bushing outdoor terminal, comprising a mounting base plate, wherein the upper end of the mounting base plate is fixedly connected to a bushing, wherein a cable is coaxially arranged in the bushing, wherein the upper end of the cable passes through the bushing and is connected to a lead-out clamp, and the lower end of the cable passes through the mounting base plate and is connected to a tail pipe, wherein the cable in the bushing is closely matched with the bushing through a multiple sealing mechanism to form a sealed cavity, wherein the sealed cavity is filled with insulating oil, wherein a stress cone is arranged on the cable in the bushing, wherein the multiple sealing mechanism comprises a positioning tube, wherein an annular groove is provided on the upper end surface of the positioning tube, wherein a limiting sleeve of the annular groove extending upward is fixedly arranged in the annular groove, wherein an annular rubber sleeve is interference fit between the limiting sleeve and the stress cone, wherein the 110kV oil-filled insulating bushing outdoor terminal has a simple structure, can effectively prevent leakage, and is safe and stable.

Description

Technical Field

[0001] The invention relates to a 110kV oil-filled insulating bushing outdoor terminal. Background Art

[0002] With the development of my country's power construction, the demand for electricity continues to rise, especially with the construction of high-voltage and ultra-high-voltage power grids. The demand for cross-linked polyethylene insulated power cables with voltage levels of 66kV and above is increasing, which also promotes the rapid development of cable accessories. Cable outdoor terminals are the main cable accessories, through which underground cables and high-voltage transmission lines on high-voltage transmission towers are reliably connected. The current cable terminal products include fully dry silicone rubber outdoor terminals and oil-filled terminals, and the oil-filled terminals are widely used. However, the oil-filled terminals currently have the problem of poor sealing and leakage. If the insulating oil leaks for a long time, a terminal breakdown accident may occur.

[0003] The current sealing method for oil-filled outdoor terminals to prevent oil leakage mainly uses wrapped waterproof tape and ordinary O-rings. The sealing cannot be guaranteed, and there is a risk of oil leakage at the installation fixing plate. When a short circuit between phases or between phases and ground occurs due to power system failure or extreme weather, explosions often occur. If there are no protective measures, it will bring great safety hazards to the normal operation of the power system and the surrounding environment. Summary of the invention

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a 110kV oil-filled insulating bushing outdoor terminal, which is not only structurally reasonable but also safe and stable.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a 110kV oil-filled insulating bushing outdoor terminal, including a mounting base plate, the upper end of the mounting base plate is fixedly connected to the bushing, a cable is coaxially arranged in the bushing, the upper end of the cable passes through the bushing and is connected to the outlet clamp, and the lower end passes through the mounting base plate and is connected to the tail pipe. The cable located in the bushing is tightly matched with the bushing through multiple sealing mechanisms to form a sealed cavity, and the sealed cavity is filled with insulating oil. A stress cone is provided on the cable located in the bushing, and an insulating sleeve is provided on the outside of the cable below the stress cone.

[0006] Furthermore, the multiple sealing mechanism includes a positioning tube, an annular groove is formed on the upper end surface of the positioning tube, a limiting sleeve extending upward from the annular groove is fixed in the annular groove, and an annular rubber sleeve is interference fit between the limiting sleeve and the insulating sleeve.

[0007] Furthermore, an annular pressure plate is pressed on the upper end of the annular rubber sleeve, the inner end of the annular pressure plate is fixedly connected to the insulating sleeve and extends horizontally in the sealing cavity. The limiting sleeve is in the shape of a trumpet that is larger at the top and smaller at the bottom, and an outer edge extends horizontally outward from the top of the limiting sleeve. A number of through holes are correspondingly opened on the outer edge and the annular pressure plate, and all are vertically penetrated and connected and locked by bolts.

[0008] Furthermore, the outer wall of the annular rubber sleeve cooperates with the inner wall of the limiting sleeve to extend in an arc shape, a rubber plate is coaxially and parallelly arranged above the annular pressure plate, a flange is arranged at the outer end of the rubber plate, and an annular groove is provided on the inner wall of the sleeve to cooperate with the flange.

[0009] Furthermore, the positioning sleeve is arranged outside the insulating sleeve, and a supporting flange is horizontally extended at the top, the annular groove is opened on the upper surface of the supporting flange, and the lower end of the supporting flange is supported by the top of the mounting base plate and is locked by bolts.

[0010] Furthermore, an annular sealing groove is provided on the upper surface of the support flange, a sealing ring is provided in the sealing groove for pressing and sealing the bottom end of the bushing, the outer side of the bottom end of the bushing is locked with the mounting base plate by bolts, and a support insulator is provided at the bottom end of the mounting base plate.

[0011] Furthermore, an annular outer cover is coaxially fixed to the bottom end of the sleeve, and the outer cover opens downward to cover the mounting base plate.

[0012] Furthermore, the sleeve is a porcelain sleeve or a composite sleeve, and is generally in a cone shape that is small at the top and large at the bottom.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the bottom end of the limiting sleeve is inserted into the annular groove and welded to the positioning tube as a whole, the annular rubber sleeve is interference-locked between the limiting sleeve and the insulating sleeve, and is tightened by the annular pressure plate to ensure the sealing, and the rubber plate and the flange are clamped in the annular groove to prevent leakage, that is, the multiple sealing design ensures a better sealing effect; the design of the installation base plate and the annular outer cover guides the power of the explosion in the event of a fault downward, thereby reducing the damage surface of the terminal to a controllable range, effectively avoiding property loss and protecting the power system.

[0014] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A is an enlarged schematic diagram.

[0017] In the figure: 1-mounting base plate, 2-bushing, 3-cable, 4-outlet clamp, 5-tail pipe, 6-multiple sealing mechanism, 7-sealing chamber, 8-insulating oil, 9-stress cone, 10-insulating sleeve, 11-positioning tube, 12-annular groove, 13-limiting sleeve, 14-annular rubber sleeve, 15-annular pressure plate, 16-outer eaves, 17-through hole, 18-bolt, 19-rubber sheet, 20-flange, 21-annular slot, 22-support flange, 23-sealing groove, 24-sealing ring, 25-pillar insulator, 26-annular outer cover. DETAILED DESCRIPTION

[0018] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description.

[0019] like Figure 1~2 As shown, a 110kV oil-filled insulating bushing outdoor terminal comprises a mounting base plate 1, a bushing 2 is fixedly connected to the upper end of the mounting base plate, a cable 3 is coaxially arranged in the bushing, the upper end of the cable passes through the bushing and is connected to the outlet clamp 4, the lower end passes through the mounting base plate and is connected to the tail pipe 5, the tail pipe is located in the insulating bushing, the cable in the bushing is tightly matched with the bushing through a multiple sealing mechanism 6 to form a sealed cavity 7, the sealed cavity is filled with insulating oil 8, a stress cone 9 is provided on the cable in the bushing, and an insulating sleeve 10 is provided outside the cable under the stress cone, the multiple sealing mechanism comprises a positioning tube 11, an annular groove 12 is opened on the upper end surface of the positioning tube, a limiting sleeve 13 extending upward out of the annular groove is fixed in the annular groove, the bottom end of the limiting sleeve is inserted into the annular groove and is welded to the positioning tube as a whole, and an annular rubber sleeve 14 is interference fit between the limiting sleeve and the insulating sleeve.

[0020] In the embodiment of the present invention, an annular pressure plate 15 is pressed on the upper end of the annular rubber sleeve, the inner end of the annular pressure plate is fixedly connected to the insulating sleeve and extends horizontally in the sealing cavity. The limiting sleeve is in the shape of a trumpet with a larger upper part and a smaller lower part, and an outer edge 16 extends horizontally outward from the top of the limiting sleeve. A number of through holes 17 are correspondingly opened on the outer edge and the annular pressure plate, and they are all connected and locked by bolts 18 vertically penetrating the through holes.

[0021] In an embodiment of the present invention, the outer wall of the annular rubber sleeve cooperates with the inner wall of the limiting sleeve to extend in an arc shape, a rubber plate 19 is coaxially and parallelly arranged above the annular pressure plate, a flange 20 is arranged at the outer end of the rubber plate, and an annular groove 21 is provided on the inner wall of the sleeve to cooperate with the flange.

[0022] In an embodiment of the present invention, the positioning sleeve is arranged outside the insulating sleeve, and the lower end of the positioning sleeve and the outside of the insulating sleeve can be connected to each other for waterproofing through a double-layer tetrafluoroethylene self-adhesive tape. A support flange 22 extends horizontally from the top of the positioning sleeve, and the annular groove is provided on the upper surface of the support flange. The lower end of the support flange is supported by the top of the mounting base plate and is locked by bolts.

[0023] In the embodiment of the present invention, an annular sealing groove 23 is provided on the upper surface of the support flange, and a sealing ring 24 is provided in the sealing groove for pressing and sealing the bottom end of the bushing. The outer side of the bottom end of the bushing is locked with the mounting base plate by bolts, and a support insulator 25 is provided at the bottom end of the mounting base plate.

[0024] In the embodiment of the present invention, an annular outer cover 26 is coaxially fixedly disposed on the bottom end of the sleeve, and the outer cover opens downward to cover the mounting base plate therein.

[0025] In the embodiment of the present invention, the sleeve is a porcelain sleeve or a composite sleeve, and is generally in a cone shape that is smaller at the top and larger at the bottom.

[0026] In the embodiment of the present invention, the bottom end of the limiting sleeve is inserted into the annular groove and welded to the positioning tube as a whole, the annular rubber sleeve is interference fit between the limiting sleeve and the insulating sleeve, and is tightened by the annular pressure plate to ensure the sealing, and cooperates with the rubber plate and the flange to be clamped in the annular groove to prevent leakage, that is, the multiple sealing design ensures a better sealing effect; by installing the bottom plate and the annular outer cover, the power of the explosion in the event of a fault is guided downward, thereby reducing the damage surface of the terminal to a controllable range, effectively avoiding property loss and protecting the power system.

[0027] The present invention is not limited to the above-mentioned best implementation mode. Anyone can obtain other various forms of 110kV oil-filled insulating bushing outdoor terminal under the enlightenment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. A 110kV oil-filled insulating bushing outdoor terminal, characterized by: It includes a mounting base plate, the upper end of the mounting base plate is fixedly connected to a sleeve, a cable is coaxially arranged in the sleeve, the upper end of the cable passes through the sleeve and is connected to the outlet clamp, and the lower end passes through the mounting base plate and is connected to the tail pipe. The cable in the sleeve is closely matched with the sleeve through multiple sealing mechanisms to form a sealed cavity, and the sealed cavity is filled with insulating oil. A stress cone is arranged on the cable in the sleeve, and an insulating sleeve is arranged outside the cable below the stress cone; The multiple sealing mechanism comprises a positioning tube, an annular groove is formed on the upper end surface of the positioning tube, a limiting sleeve extending upward out of the annular groove is fixed in the annular groove, and an annular rubber sleeve is provided between the limiting sleeve and the insulating sleeve for interference fit; An annular pressing plate is pressed on the upper end of the annular rubber sleeve, the inner end of which is fixedly connected to the insulating sleeve and extends horizontally in the sealing cavity. The limiting sleeve is in the shape of a trumpet with a larger top and a smaller bottom, and an outer edge extends horizontally outward from the top of the limiting sleeve. The outer edge and the annular pressing plate are correspondingly provided with a plurality of through holes, and are all vertically penetrated by bolts to connect and lock; The outer wall of the annular rubber sleeve cooperates with the inner wall of the limiting sleeve to extend in an arc shape, a rubber plate is coaxially and parallelly arranged above the annular pressure plate, a flange is arranged at the outer end of the rubber plate, and an annular groove for matching with the flange is arranged on the inner wall of the sleeve; An annular outer cover is coaxially fixedly arranged at the bottom end of the sleeve, and the outer cover opens downwards to cover the mounting bottom plate.

2. A 110kV oil-filled insulating bushing outdoor terminal according to claim 1, characterized in that: The positioning sleeve is arranged outside the insulating sleeve, and a support flange is horizontally extended at the top, the annular groove is arranged on the upper surface of the support flange, and the lower end of the support flange is supported by the top of the mounting base plate and is locked by bolts.

3. A 110kV oil-filled insulating bushing outdoor terminal according to claim 2, characterized in that: An annular sealing groove is provided on the upper surface of the support flange, and a sealing ring is provided in the sealing groove for pressing and sealing the bottom end of the bushing. The outer side of the bottom end of the bushing is locked with the mounting base plate by bolts, and a support insulator is provided at the bottom end of the mounting base plate.

4. A 110kV oil-filled insulating bushing outdoor terminal according to claim 1, characterized in that: The sleeve is a porcelain sleeve or a composite sleeve, and is generally in a cone shape that is small at the top and large at the bottom.

Images