Composite bushing terminal for 110kV power cable

Abstract

The utility model discloses a composite sleeve terminal for a 110kV power cable. The composite sleeve terminal is provided with a flange base, a sleeve pressing flange is installed on the flange base, a tail pipe is installed downwards at the center of the bottom of the flange base, a composite sleeve is installed on the sleeve pressing flange, and a cable is installed in the composite sleeve in an up-down penetrating mode. A stress cone flange is arranged on the flange base inside the composite sleeve, the stress cone flange is sleeved on the outer wall of the cable, a stress cone is arranged on the stress cone flange, the stress cone is tightly sleeved on the outer wall of the cable, and the lower part of the stress cone is tightly sleeved on the stress cone flange and is locked by a locking mechanism; the top of the composite sleeve is connected with an anti-corona cover through a top flange, the anti-corona cover is provided with an outgoing line fitting, and the inner side end of the outgoing line fitting is connected with the cable; the inner space of the composite sleeve is filled with insulating oil; the structural design of the terminal product is improved, so that the actual use effect is greatly improved, and the service life is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of power transmission connection terminal structure, and in particular to a composite sleeve terminal for 110kV power cables. Background Technology

[0002] Currently, in the use of large-scale high-voltage power transmission cables, many places require the use of large cable connection terminals. Many of these large terminals are made of porcelain bushings. However, once these terminals malfunction, the entire porcelain bushing can easily shatter and cause injury. Moreover, due to structural design defects, the connection and sealing problem between the stress cone inside many porcelain bushings and the base flange has not been well resolved. As the service time increases, the insulating oil in the bushing cavity will slowly seep downwards from the connection point, causing the insulating oil level in the cavity to gradually decrease until it fails to meet the usage requirements. In this case, the entire terminal will be rendered unusable, affecting its actual service life. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned situation by providing a composite bushing terminal for 110kV power cables. This terminal product has been improved in terms of structural design, which greatly enhances its actual performance and service life.

[0004] The specific solution of this utility model is as follows: a composite bushing terminal for 110kV power cables, having a flange base, a bushing clamping flange mounted on the flange base, a tail pipe mounted downwards at the center of the bottom of the flange base, a composite bushing mounted on the bushing clamping flange, and cables threaded vertically inside the composite bushing. The cables exit from the tail pipe at the bottom of the flange base and are wrapped with a cable sheath assembly. Inside the composite bushing, a stress cone flange is provided on the flange base. The stress cone flange is fitted onto the outer wall of the cable, and a stress cone is mounted on the stress cone flange. The stress cone is tightly fitted onto the outer wall of the cable, and the lower part of the stress cone is tightly fitted onto the stress cone flange and locked with a locking mechanism. The top of the composite bushing is connected to an anti-corona cover via a top flange. The anti-corona cover is provided with a lead-out fitting, the inner end of which is connected to the cable. The internal space of the composite bushing is filled with insulating oil.

[0005] Furthermore, the composite sleeve described in this utility model is composed of an inner glass fiber tube and an outer silicone rubber skirt tightly bonded together.

[0006] Furthermore, the stress cone in this utility model includes an upper cone made of silicone rubber and a lower sealing sleeve. The lower sealing sleeve is fitted onto the flange sleeve of the stress cone flange, and the sealing sleeve and the flange sleeve of the stress cone flange are locked together by a locking mechanism.

[0007] Furthermore, the locking mechanism described in this utility model includes several annular grooves disposed on the outer wall of the flange cylinder of the stress cone flange and a locking clamp placed on the outside. The sealing sleeve is sleeved on the outer wall of the annular groove, and the locking clamp locks from the position of the outer wall of the sealing sleeve corresponding to the annular groove.

[0008] Furthermore, in this utility model, the flange base is also connected to four corners with support insulators.

[0009] Furthermore, the cable sheath assembly described in this utility model includes a cable metal sheath, a cable outer sheath, two layers of waterproof tape, and an outermost heat shrink tubing, with each layer arranged from the inside out.

[0010] This utility model is an improved design of existing high-voltage cable terminals, which makes them safer and more airtight. The composite sleeve is safer to use, and the newly designed internal stress cone can better prevent the leakage of insulating oil, thus improving its service life. The entire terminal has great practical application and promotion value. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model (including partial openings);

[0012] Figure 2 This is a schematic diagram of the stress cone structure in this utility model.

[0013] In the diagram: 1—Outgoing line hardware, 2—Anti-corona cover, 3—Top flange, 4—Composite bushing, 5—Cable, 6—Insulating oil, 7—Outer silicone rubber shed, 8—Inner fiberglass tube, 9—Post insulator, 10—Cable sheath assembly, 11—Tail pipe, 12—Flange base, 13—Bushing clamping flange, 14—Stress cone, 15—Cone, 16—Annular groove, 17—Sealing sleeve, 18—Stress cone flange. Detailed Implementation

[0014] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0015] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] See Figures 1-2 This utility model relates to a composite bushing terminal for 110kV power cables, comprising a flange base 12. Further, post insulators 9 are connected to the four corners of the flange base. A bushing clamping flange 13 is mounted on the flange base. A tail pipe 11 is installed downwards at the center of the bottom of the flange base. A composite bushing 4 is mounted on the bushing clamping flange. Further, the composite bushing is composed of an inner glass fiber tube 8 and an outer silicone rubber shed 7 tightly bonded together. Cables 5 are threaded vertically inside the composite bushing, exiting from the tail pipe at the bottom of the flange base and wrapped with a cable sheath assembly 10. Further, this utility model… The cable sheath assembly described herein includes a cable metal sheath, a cable outer sheath, two layers of waterproof tape, and an outermost heat shrink tubing, with each layer arranged from the inside out. Inside the composite sleeve, a stress cone flange 18 is located on a flange base. The stress cone flange is fitted onto the outer wall of the cable, and a stress cone 14 is mounted on the stress cone flange. The stress cone is tightly fitted onto the outer wall of the cable, and the lower part of the stress cone is tightly fitted onto the stress cone flange and locked with a locking mechanism. The top of the composite sleeve is connected to an anti-corona cover 2 via a top flange 3. A lead-out fitting 1 is provided on the anti-corona cover, and the inner end of the lead-out fitting is connected to the cable. The internal space of the composite sleeve is filled with insulating oil 6.

[0017] Furthermore, in this embodiment, the stress cone includes an upper cone 15 made of silicone rubber and a lower sealing sleeve 17. The lower sealing sleeve is fitted onto the flange sleeve of the stress cone flange, and a locking mechanism is used to lock the sealing sleeve and the flange sleeve of the stress cone flange. Furthermore, the locking mechanism in this invention includes several annular grooves 16 disposed on the outer wall of the flange sleeve of the stress cone flange and an external locking clamp. The sealing sleeve is fitted onto the outer wall of the annular grooves, and the locking clamp locks the sealing sleeve from the position corresponding to the annular grooves on the outer wall of the sealing sleeve.

[0018] This utility model serves as an outdoor terminal and high-voltage cable terminal, particularly applicable to 110kV high-voltage cable connection terminals. The upper outgoing fittings connect outwards, and the inner cavity of the composite bushing is filled with insulating oil. The insulating oil typically does not fill the entire cavity, but rather reaches a height of 10-15cm above the anti-corona cover at the top of the composite bushing, allowing for normal thermal expansion and contraction. During terminal use, in the event of a dangerous situation such as an explosion, the rubber-made composite bushing will not pose a danger to surrounding objects. Simultaneously, the connection between the internal stress cone and the stress cone flange will not leak, significantly extending the service life.

[0019] This utility model is an improved design of existing high-voltage cable terminals, which makes them safer and more airtight. The composite sleeve is safer to use, and the newly designed internal stress cone can better prevent the leakage of insulating oil, thus improving its service life. The entire terminal has great practical application and promotion value.

Claims

1. A composite bushing terminal for 110 kV power cables having a flanged base, characterized in that: The flange base is provided with a sleeve pressing flange, and a tail pipe is arranged at the center of the bottom of the flange base. A composite sleeve is arranged on the sleeve pressing flange, and a cable is arranged in the composite sleeve. The cable is wrapped with a cable sheath assembly and is arranged out of the tail pipe at the bottom of the flange base. A stress cone flange is arranged on the flange base above the composite sleeve, and the stress cone flange is sleeved on the outer wall of the cable. A stress cone is arranged on the stress cone flange, and the stress cone is tightly sleeved on the outer wall of the cable. The lower part of the stress cone is tightly sleeved on the stress cone flange and is locked by a locking mechanism. A counterpoise cover is connected to the top of the composite sleeve through a top flange, and a wire outlet fitting is arranged on the counterpoise cover. The inner side of the wire outlet fitting is connected to the cable. Insulating oil is filled in the space of the composite sleeve.

2. The composite bushing terminal for 110 kV power cables according to claim 1, characterized in that: The composite sleeve is composed of an inner glass fiber pipe and an outer silicon rubber umbrella skirt.

3. The composite bushing terminal for 110 kV power cables according to claim 1, characterized in that: The stress cone comprises a cone body made of silicon rubber at the upper part and a sealing sleeve at the lower part. The sealing sleeve is sleeved on the flange barrel of the stress cone flange, and the sealing sleeve and the flange barrel of the stress cone flange are locked by a locking mechanism.

4. The composite bushing terminal for 110 kV power cables according to claim 3, characterized in that: The locking mechanism comprises a plurality of annular grooves arranged on the outer wall of the flange barrel of the stress cone flange and a locking hoop arranged outside. The sealing sleeve is sleeved on the outer wall of the annular groove, and the locking hoop is locked from the position corresponding to the annular groove on the outer wall of the sealing sleeve.

5. The composite bushing terminal for 110 kV power cables according to claim 1, characterized in that: Support insulators are further connected to the four corners of the flange base.

6. The composite bushing terminal for 110 kV power cables according to claim 1, characterized in that: The cable sheath assembly comprises a cable metal sheath, a cable outer sheath, two layers of waterproof adhesive tape, and a heat shrink tube at the outermost layer.

Images