CN210430892U

CN210430892U - T-shaped joint of high-voltage three-core direct-buried cable

Info

Publication number: CN210430892U
Application number: CN201921357686.4U
Authority: CN
Inventors: 商行
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-04-28
Anticipated expiration: 2029-08-20

Abstract

The invention belongs to the technical field of cable lines, and particularly relates to a T-shaped joint of a high-voltage three-core direct-buried cable. The utility model provides a tap-off box majority in the prior art in urban area and field, dredges the management, and the condition that the accident appears also can not in time discover, and inconvenient management also does not do benefit to safe problem, the utility model discloses compare with prior art, more safe and reliable does not occupy the ground space, low in cost.

Description

T-shaped joint of high-voltage three-core direct-buried cable

Technical Field

The invention belongs to the technical field of cable lines, and particularly relates to a T-shaped joint of a high-voltage three-core directly-buried cable.

Background

The cable line often appears the condition of T connection, especially 10KV cable line, and the current market all adopts the cable distribution box to accomplish the engineering of T connection. Not only does this affect the beauty of the city appearance, but also occupies a certain land and space. The distribution box is mostly in urban areas and in the field, so that management is often careless, and once an accident occurs, the distribution box cannot be found in time, so that the management is inconvenient and the safety is not facilitated. In addition, the manufacturing cost of the branch box and the cable bending chamber foundation is high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a high-voltage three-core direct-buried cable T-shaped joint, which solves the problems that most of junction boxes in the prior art are in urban areas and in the field, are carefree for management, cannot be found in time when accidents occur, and are inconvenient to manage and not beneficial to safety.

The present invention is achieved in such a way that,

a high voltage three-core buried cable T-joint, comprising:

three T type conducting rods that leave the interval each other and that are parallel are fixed to be formed the T type structure that has three direction, the T type structure outside is filled with the inner sheath layer, and the clothing has the ground wire of weaving in one side outside the inner sheath layer to make the length of weaving the ground wire have reserve length in three direction, fill the oversheath layer outside the inner sheath layer that the clothing has the ground wire of weaving.

Further, the woven ground wire is a T-shaped woven ground wire.

Further, the three ends of the T-shaped conducting rod are provided with external threads.

Furthermore, the T-shaped conducting rod is sequentially wrapped with an inner semi-conducting layer, a main insulating layer, an outer semi-conducting layer and a copper shielding layer.

Furthermore, an inner semi-conducting layer, a main insulating layer, an outer semi-conducting layer and a copper shielding layer are sequentially wrapped outside the T-shaped conducting rod, and the lengths of the inner semi-conducting layer, the main insulating layer, the outer semi-conducting layer and the copper shielding layer are sequentially shortened.

Furthermore, the main insulating layer is shorter than the inner semi-conducting layer by 3-4mm, the outer semi-conducting layer is shorter than the main insulating layer by 106-110mm, and the copper shielding layer is shorter than the outer electric conducting layer by 45-60 mm.

Further, the length of the inner sheath layer in the three directions of the T-shaped conducting rod is smaller than that of the T-shaped conducting rod.

Further, the length of the outer sheath layer in three directions of the T-shaped conducting rod is smaller than that of the inner sheath layer in three directions.

Compared with the prior art, the invention has the beneficial effects that:

the invention has simple structure and small volume, and is directly connected underground. In the prior art, a concrete ground groove foundation needs to be made, a huge tapping box is built on the foundation, and cables in the tapping box are connected through terminals such as a switch. Compared with the prior art, the invention is safer and more reliable, does not occupy the ground space and has low manufacturing cost. Structurally, the connection of a main electric core, the connection of an inner semi-conducting layer, the manufacture of a main insulating layer, the connection of an outer semi-conducting layer, the connection of a copper shielding layer, the connection of an inner sheath, the connection of a cable armor layer and the connection of an outer sheath all accord with technical specifications, and the waterproof performance is durable. The single manufacturing cost is saved by at least 16 million yuan RMB.

Drawings

FIG. 1 is a schematic view of the internal structure of a T-joint according to an embodiment of the present invention;

fig. 2 is a schematic external structural diagram according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the high-voltage three-core direct-buried cable T-shaped connector has a T-shaped structure to form three ends, three cores adopt three T-shaped conducting rods 1, the three T-shaped conducting rods are arranged in parallel with a certain distance left therebetween, and the distance satisfies winding of a semi-conducting belt, binding of a binding wire (or a constant force spring) and the like in later connection. If the cable section is large, which causes too large space, the root of the middle one can be made flat, namely, the root is the place where the main cell space is crossed.

An inner semi-conducting layer 7, a main insulating layer 6, an outer semi-conducting layer 5 and a copper shielding layer 4 are sequentially wrapped outside each T-shaped conducting rod from the inner layer to the outer layer. Wherein the inner semiconductive layer material is a carbon black filled semiconductive material, the insulating layer material is crosslinked polyethylene, and the outer semiconductive layer material is a carbon black filled semiconductive material.

The three T-shaped conducting rods are required to be smooth in surface and free of burrs, can be made of copper materials, and external threads are machined at three end portions of each conducting rod.

Three conducting rod position are fixed and are filled inner sheath layer 3, have filled inner sheath layer 3 in the T type structure outside, one side subsides outside inner sheath layer 3 has woven ground wire 8 (see fig. 2), and make the length of weaving the ground wire have reserve length in three direction, fill the outer sheath layer outside the inner sheath layer that has woven the ground wire of subsides, and make the ground wire of weaving will remain in the three direction of T shape structure enough, be not less than 1.5m, the cross-section will accord with the standard requirement. The woven ground wire is a T-shaped woven ground wire.

The length of the inner sheath layer in the three directions of the T-shaped conducting rod is smaller than that of the T-shaped conducting rod. The length of the outer sheath layer in three directions of the T-shaped conducting rod is smaller than that of the inner sheath layer in three directions. Thereby facilitating the connection with the cable.

The preparation process of the invention comprises the following steps:

manufacturing three T-shaped conducting rods, processing an external thread at the end part of each T-shaped conducting rod, and manufacturing a T-shaped woven ground wire;

sequentially filling and wrapping an inner semi-conducting layer, a main insulating layer, an outer semi-conducting layer and a copper shielding layer on each T-shaped conducting rod;

fixing the positions of the three T-shaped conducting rods and filling the inner sheath layer;

a T-shaped woven ground wire is adhered to one side outside the inner sheath layer, and then the outer sheath layer is poured.

The installation process of the T-shaped joint of the high-voltage three-core direct-buried cable comprises the following steps:

after the cable trench is opened, the length of the cable trench is 1.5 meters and the width of the cable trench is 0.3 meter in each of three directions of the T-shaped joint. (or a layer of kneaded clay mat);

after cleaning the site and preparing the material tool, the T-joint connection is started.

Measuring an outer protective layer with the length of 840mm from a cable head, peeling off and removing, reserving an armor layer with the length of 50mm, peeling off and removing the rest, reserving an inner protective layer with the length of 150mm, and peeling off and removing the rest;

screwing a cable connecting pipe on the end of each conducting rod of the T-shaped joint; copper connecting pipe for copper cable, copper aluminium connecting pipe for aluminium cable when screwing up accidentally injure the connecting pipe, will polish smoothly with insulating abrasive paper. The cable intermediate joint comprises a crimping cable core wire, a winding inner semi-conducting layer, a mounting main insulating layer, a winding outer semi-conducting layer and a connecting copper shielding layer; the processing and the method of the cable are completely consistent with those of the cable intermediate joint which is common in the market, and the processing and the method comprise materials and tools.

After the copper shielding layer is connected, placing a triangular support bar in the middle of three core wires of the T-shaped joint; the cross section of the triangular support bar is divided into three angles, and three conducting rods are supported, if gaps exist, the inner (outer) protective layer of the cable which is stripped before can be used, is cut into strips by a cutter, is filled, and is bound and fixed.

After a sealing rubber strip is wound on the T-shaped connector and the inner protection layer of the cable, an inner protection layer sleeve is installed;

after the inner sheath sleeve is installed, the braided ground wire is wound on the inner sheath sleeve for two weeks and then connected to an armor layer of the cable, and the connection is firm and good in contact;

after the braided ground wire is installed, the sealing rubber strip is wound on the T-shaped joint and the outer protection layer of the cable, and then the outer protection layer sleeve is installed.

After the T-shaped joint is connected, a soft soil or sand layer with the thickness of not less than 100mm, for example 120mm in one embodiment, is laid on the tamped surface or the concrete cushion layer in the cable trench; after the T-joint is cooled, it is placed on a soft soil or sand layer, and a soft soil or sand layer with a thickness of not less than 100mm, for example 129mm in one embodiment, is laid on the T-joint and the adjacent sides, covering a protective plate with a width of not less than 50mm on each of the two sides of the three branches of the T-joint. For example 60mm in one embodiment.

10KV--120mm²The T-shaped joint of the cable is suitable for 120mm²And 10KV three-core cables of all specifications below. For example for 95mm²When the cable is in specification, only the cable connecting pipe needs to be replaced, and the inner diameter of one end of the crimping connection is 95mm²The specification of the cable is required to be processed (for example, phi 13 mm). 120mm²—300mm²The 10KV three-core cable can use 10 KV-300 mm²A cable T-joint; 300mm²—500mm²The 10KV three-core cable can use 10 KV-500 mm²And a T-shaped joint of the cable.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A T-shaped joint of a high-voltage three-core direct-buried cable is characterized by comprising:

2. The connector of claim 1 wherein said woven ground wire is a T-shaped woven ground wire.

3. A connector as defined in claim 1, wherein said T-shaped conductive rod is externally threaded at each of three ends thereof.

4. A joint as defined in claim 1, wherein said T-shaped conductor bar is surrounded by an inner semiconductive layer, a main insulation layer, an outer semiconductive layer and a copper shield layer in that order.

5. A joint according to claim 4 wherein the lengths of the inner semiconductive layer, main insulation layer, outer semiconductive layer and copper shield layer are successively shorter.

6. A joint as claimed in claim 4, wherein the main insulating layer is 3-4mm shorter than the inner semiconducting layer, the outer semiconducting layer is 106-110mm shorter than the main insulating layer, and the copper shield is 45-60mm shorter than the outer electrically conducting layer.

7. The connector of claim 1 wherein the inner jacket layer has a length in three directions of the T-shaped conductive rod that is less than the length in three directions of the T-shaped conductive rod.

8. The connector of claim 1 wherein the outer jacket layer has a length in three directions of the T-shaped conductive rod that is less than the length of the inner jacket layer in three directions.