Multi-loop gas insulated cable branch joint

Abstract

The utility model relates to the technical field of power transmission equipment, in particular to a multi-loop gas insulated cable branch joint, which comprises a box body, a sleeve, a mounting flange, a connecting bar, an SF6 pressure gauge and an incoming and outgoing line terminal, the incoming and outgoing line terminal is inserted in an inner hole of the sleeve, hardware fittings at the top of the sleeve are connected through the connecting bar, and the box body is a regular polyhedron. The central axis of each side surface is provided with one or three holes which are respectively suitable for single-core and three-core cables, the size of each hole is matched with that of a sleeve, and the holes can be used for insertion of incoming and outgoing line terminals; the upper end face of the box body is connected with an SF6 pressure gauge, the lower end face of the box body is closed, and a grounding terminal mounting hole is reserved outside the box body. And the loop can be reserved according to different construction time of the loop. Branching can be carried out according to the arrangement direction of the cable, the bending radius of the cable is reduced, and the occupied area is saved. The device is installed underground, can save earth surface land, and avoids external hidden dangers of normal operation of cable lines. The sleeve is preassembled in a factory, and only a plugging terminal needs to be manufactured on site, so that the installation is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission equipment, in particular to a multi-circuit gas-insulated cable branch connector. Background Art

[0002] At present, domestic medium-voltage line tapping and switching are mostly achieved by branch boxes, which are installed on cable trenches or bridges. When the branch box is installed vertically above the cable trench, the cables in the cable trench are arranged in a disorderly manner and are difficult to distinguish. The cable branch box is placed on the surface, which takes up a lot of space, wastes inherent resources and environment, and increases infrastructure investment; the branch box is exposed to the outside for a long time, which is prone to corrosion and rust and damage by external forces, affecting the normal power supply of the entire railway. Therefore, we proposed a multi-circuit gas-insulated cable branch joint to solve the above problems. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a multi-circuit gas-insulated cable branch connector.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A multi-circuit gas-insulated cable branch joint, comprising a box, a bushing, a mounting flange, a connecting bar, an SF6 pressure gauge, and an inlet and outlet terminal. The inlet and outlet terminals are inserted into the inner holes of the bushing, and the hardware on the top of the bushing is connected through the connecting bar. The box is a regular polyhedron, and one or three holes are opened on the central axis of each side, respectively suitable for single-core and three-core cables. The size of the hole is matched with the bushing, and can be used for the insertion of the inlet and outlet terminals;

[0006] The upper end surface of the box body is connected with an SF6 pressure gauge, and the lower end surface of the box body is closed, and a ground terminal mounting hole is reserved outside.

[0007] As a preferred technical solution of the utility model, epoxy resin is arranged in the sleeve, and the outer shape of the sleeve is conical, the upper end of the interior is embedded with a conductive tube, the conductive tube is exposed from the epoxy resin for a distance, the lower end of the interior is a conical hole, which is connected with the internal hole of the conductive tube, and the lower part of the conductive tube is embedded with a threaded sleeve, the end face of the threaded sleeve is flush with the lower end face of the sleeve, and a circle of sealing ring groove is left on the lower end face of the sleeve near the outer ring.

[0008] As a preferred technical solution of the utility model, the mounting flange is connected and fixed to the box body and the sleeve by means of hexagon socket screws, and an end face seal is provided on the surface where the mounting flange fits the box body.

[0009] As a preferred technical solution of the utility model, the inlet and outlet terminal has a conductor connecting device, a stress cone pressure ring, a stress cone, a spring clamping device and a tail pipe in sequence from the end to the inside. The contact of the conductor connecting device extends into the casing hole and can fit with the inner hole of the conductive tube to achieve electrical connection. The stress cone pressure ring limits the upper plane position of the stress cone, and the outer surface of the stress cone extends into the casing hole and can fit with the casing cone hole. A platform is provided in the tail pipe to adjust the spring force of the spring clamping device. The tail pipe and the mounting flange are fastened by screws. In the installed state, the stress cone is subjected to a constant force of the spring clamping device 11.

[0010] As a preferred technical solution of the utility model, the conductive tube in the sleeve is made of red copper with a copper content greater than 99.9%, and the material of the box body is a conductive aluminum alloy.

[0011] The beneficial effects of the utility model are:

[0012] 1. The whole is prefabricated in the factory. The number of sleeves and the number of box sides can be increased or decreased according to the number of cable loops. The structure of the connecting bar can be designed according to the number of incoming and outgoing lines of the line, and the type can be selected directly when selecting.

[0013] 2. Applicable to various types of cable wells to avoid cable bending and small size.

[0014] 3. The box of the branch joint is prefabricated in the factory. Only the inlet and outlet terminal heads need to be made on site, and they are plugged and connected with the branch box. The installation is simple and there is no need to open the box. The circuit can be reserved, and the installation flexibility is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a multi-circuit gas-insulated cable branch connector proposed by the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure with the section view at CC in the middle.

[0017] In the figure: 1. SF6 pressure gauge; 2. Box body; 3. Tail pipe; 4. Inlet and outlet terminals; 5. Mounting flange; 6. Bushing; 7. Conductor connection device; 8. Stress cone pressure ring; 9. Connection row; 10. Stress cone; 11. Spring clamping device. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1-2A multi-circuit gas-insulated cable branch connector includes a box 2, a bushing 6, a mounting flange 5, a connecting bar 9, an SF6 pressure gauge 1, and an inlet and outlet terminal 4. The bushings 6 in the box 2 are connected by a copper bar, and the SF6 gas is insulated to realize the branching of the circuit. It can adapt to various forms of cable wells, realize the branching of new and old circuits at different heights at the cable trench, and reduce the bending radius of the cable.

[0020] The present invention provides a multi-circuit gas insulated cable branch joint, comprising a box body 2, a bushing 6, a mounting flange 5, a connection bar 9, an SF6 pressure gauge 1, and an inlet and outlet terminal 4. The inlet and outlet terminal 4 is inserted into the inner hole of the bushing 6, and the top fittings of the bushing 6 are connected through the connection bar 9.

[0021] The box 2 is a regular polyhedron, with one or three holes on the central axis of each side, which are respectively suitable for single-core or three-core cables. The size of the hole matches the sleeve 6 and can be used for inserting the inlet and outlet terminals 4. The SF6 pressure gauge 1 is connected to the upper end of the box 2 to detect the gas pressure in the box 2. The lower end of the box 2 is closed, and a ground terminal installation hole is reserved on the outside.

[0022] The sleeve 6 is provided with an insulating layer inside, the insulating layer is epoxy resin, the outer shape is conical, the upper end of the inner part is embedded with a conductive tube, the conductive tube is exposed from the epoxy for a distance, the lower end of the inner part is a conical hole, which is connected with the inner hole of the conductive tube. The lower part is embedded with a uniformly distributed threaded sleeve, the end face of the threaded sleeve is flush with the lower end face of the epoxy sleeve 6, and a circle of sealing ring groove is left near the outer circle of the lower end face of the epoxy sleeve 6.

[0023] The mounting flange 5 is connected and fixed to the box body 2 and the sleeve 6 by means of hexagon socket screws, and an end face seal is provided on the surface where the mounting flange 5 and the box body 2 are in contact.

[0024] The connecting bar 9 is made of conductive copper, and the bending size is controlled according to the arrangement position of the sleeve 6. The connecting bar 9 has a reserved mounting hole, which can be fixed with the threaded hole of the hardware at the top of the sleeve 6. The number of bending sections of the connecting bar 9 is determined according to the way of loop branching, and the cross section is determined according to the loop flow rate.

[0025] The inlet and outlet terminal 4 has a conductor connection device 7, a stress cone pressure ring 8, a stress cone 10, a spring clamping device 11, and a tail pipe 3 in order from the end to the inside. The contact of the conductor connection device 7 extends into the hole of the casing 6 and can fit with the inner hole of the conductive tube to achieve electrical connection. The stress cone pressure ring 8 limits the upper plane position of the stress cone 10. The outer surface of the stress cone 10 extends into the hole of the casing 6 and can fit with the cone hole of the casing 6. A platform is provided in the tail pipe 3 to adjust the spring force of the spring clamping device 11. The tail pipe 3 is fastened to the mounting flange 5 by screws, and the contact surface is provided with an end face seal. In the installed state, the stress cone 10 is subjected to a constant force of the spring clamping device 11.

[0026] In this embodiment: loops can be reserved according to the construction time of the loops. Cables can be branched according to the arrangement direction of the cables, reducing the bending radius of the cables and saving floor space. Installing underground can save surface land and avoid external hidden dangers of normal operation of the cable line. The casing is pre-installed in the factory, and only the plug-in terminal needs to be made on site, which is easy to install.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-circuit gas-insulated cable branch connector, comprising a box (2), a bushing (6), a mounting flange (5), a connecting bar (9), an SF6 pressure gauge (1), and an inlet and outlet terminal (4), wherein the inlet and outlet terminal (4) is inserted into the inner hole of the bushing (6), and the top fitting of the bushing (6) is connected through the connecting bar (9), characterized in that: The box body (2) is a regular polyhedron, and one or three holes are opened on the central axis of each side, which are respectively suitable for single-core and three-core cables. The size of the hole matches the sleeve (6) and can be used for inserting the inlet and outlet terminals (4); The upper end surface of the box body (2) is connected to an SF6 pressure gauge (1), and the lower end surface of the box body (2) is closed, with a ground terminal mounting hole reserved on the outside.

2. A multi-circuit gas-insulated cable branch joint according to claim 1, characterized in that: Epoxy resin is arranged in the sleeve (6), and the outer shape of the sleeve (6) is conical, the upper end of the inner part is embedded with a conductive tube, the conductive tube is exposed from the epoxy resin for a certain distance, the lower end of the inner part is a conical hole, which is connected with the inner hole of the conductive tube, and the lower part of the conductive tube is embedded with a threaded sleeve, the end face of the threaded sleeve is flush with the lower end face of the sleeve (6), and a circle of sealing ring groove is left near the outer ring on the lower end face of the sleeve (6).

3. A multi-circuit gas-insulated cable branch joint according to claim 1, characterized in that: The mounting flange (5) is connected and fixed to the box body (2) and the sleeve (6) by means of hexagon socket screws, and the surface where the mounting flange (5) and the box body (2) are in contact is provided with an end face seal.

4. A multi-circuit gas-insulated cable branch joint according to claim 2, characterized in that: The inlet and outlet terminal (4) has a conductor connection device (7), a stress cone pressure ring (8), a stress cone (10), a spring pressing device (11) and a tail pipe (3) in sequence from the end to the inside. The contact of the conductor connection device (7) extends into the hole of the sleeve (6) and can fit with the inner hole of the conductive tube to achieve electrical connection. The stress cone pressure ring (8) limits the upper plane position of the stress cone (10), and the outer surface of the stress cone (10) extends into the hole of the sleeve (6) and can fit with the cone hole of the sleeve (6). A platform is provided in the tail pipe (3) to adjust the spring force of the spring pressing device (11). The tail pipe (3) is fastened to the mounting flange (5) by screws.

5. A multi-circuit gas-insulated cable branch joint according to claim 2, characterized in that: The conductive tube in the sleeve (6) is made of red copper with a copper content greater than 99.9%, and the material of the box body (2) is a conductive aluminum alloy.

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