CN219040088U

CN219040088U - 10kV CT type double-pass sleeve

Info

Publication number: CN219040088U
Application number: CN202320238298.4U
Authority: CN
Inventors: 熊小勇; 沈惠君; 余金松
Original assignee: HANGZHOU SHUGUANG ELECTRIC APPLIANCE CO Ltd
Current assignee: HANGZHOU SHUGUANG ELECTRIC APPLIANCE CO Ltd
Priority date: 2023-02-01
Filing date: 2023-02-01
Publication date: 2023-05-16
Anticipated expiration: 2033-02-01

Abstract

The utility model discloses a 10kV CT type double-pass sleeve, which relates to the field of high-voltage electric connectors and comprises an insulator, a conductor, an induction net and an insert, wherein the insulator is coated on the periphery of the conductor, one end of the conductor extends out of the head part of the insulator, the other end of the conductor extends out of the tail part of the insulator, a disc part is formed on the outer wall of the insulator, which is close to the head part, and a mounting part is formed on the outer wall of the insulator between the disc part and the tail part and is used for sleeving a current transformer; the induction net is sleeved on the periphery of the conductor, a plurality of inserts are arranged along the periphery of the induction net, each insert is electrically connected with the outer wall of the induction net, the induction net and the inserts are fixed in the insulator, and the opening parts of the inserts are exposed from the end face of the disc part. After the power distribution cabinet is installed, the CT can be directly sleeved at the corresponding position on the sleeve, so that the space is saved, the wiring is attractive, the installation of an outgoing cable is not influenced, and the positive effect is achieved on the miniaturization of the power distribution switch.

Description

10kV CT type double-pass sleeve

Technical Field

The utility model relates to the field of high-voltage electric connectors, in particular to a 10kV CT type double-pass sleeve.

Background

The double-pass sleeve is a basic component of high-voltage power equipment and is widely applied to a high-voltage box body and a ring main unit. The structure of the induction device generally comprises a copper rod (conductor), an insulator cast on the outer wall of the copper rod, and a sleeve-type induction piece arranged in the insulator.

In recent years, with the strong construction of the national power grid to the power distribution network, the demand of the intelligent miniaturized power distribution switch is greatly increased, as shown in fig. 1 and 2, for the existing double-pass sleeve (1 '), the CT (current transformer 2 ') on the outgoing line side of the switch is mostly sleeved on the cable (3 '), and because the space on the outgoing line side of the power distribution cabinet is smaller, the CT occupies a large amount of space after being sleeved on the cable, so that the cable is inconvenient to install, the wiring of the CT is also disordered, and the attractiveness is affected.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide the 10kV CT type double-pass sleeve, after the sleeve is provided with a power distribution cabinet, CT can be directly sleeved at the corresponding position on the sleeve, so that the space is saved, the wiring is attractive, the installation of an outgoing cable is not influenced, and the positive effect is achieved on the miniaturization of the power distribution switch.

The utility model aims at being completed by the following technical scheme: the 10kV CT type double-pass sleeve comprises an insulator, a conductor, an induction net and an insert, wherein the insulator is coated on the periphery of the conductor, one end of the conductor extends out of the head of the insulator, the other end of the conductor extends out of the tail of the insulator, a disc part is formed on the outer wall, close to the head, of the insulator, and a mounting part is formed on the outer wall of the insulator between the disc part and the tail and is used for sleeving a current transformer; the induction net is sleeved on the periphery of the conductor, a plurality of inserts are arranged along the periphery of the induction net, each insert is electrically connected with the outer wall of the induction net, the induction net and the inserts are fixed in the insulator, and the opening parts of the inserts are exposed from the end face of the disc part.

As a further embodiment, the opening portion of each insert is exposed from the end surface of the disk portion on the side close to the mounting portion.

As a further technical scheme, the outer diameter of the disc part is larger than the outer diameter of the mounting part, and the outer diameter of the mounting part is larger than the outer diameter of the tail part.

As a further technical scheme, the current transformer adopts an integrated structure, namely the same current transformer is sleeved on the mounting parts of at least three insulators which are arranged in parallel.

As a further technical scheme, the end face of the disc part, which is close to one side of the mounting part, is provided with a groove, so that the opening parts of the inserts are positioned at the inner sides of the grooves.

As a further technical scheme, the insulator is made of epoxy resin material and is molded on the periphery of the conductor in a casting mode.

As a further technical solution, the diameter of the middle part of the conductor is smaller than the diameter of the two ends of the conductor.

As a further technical scheme, the partial discharge value of the double-pass sleeve at 13.2kV is smaller than 5pC.

The beneficial effects of the utility model are as follows:

1. one end mounting part is additionally arranged between the disc part and the tail part, so that the current transformer can be directly sleeved on the mounting part without being sleeved on a cable, the space in the power distribution cabinet is saved, the size of the power distribution cabinet can be further reduced, and the miniaturization of the power distribution switch is facilitated;

2. the current transformers are integrated, namely a plurality of current transformers are integrated into a whole, so that the current transformers are conveniently and integrally arranged on the double-pass sleeve, the assembly and the disassembly are more convenient, the cable wiring in the power distribution cabinet is more neat and attractive, and the power distribution cabinet is not easy to be wound in a chaotic manner;

3. the diameter of the middle part of the conductor is smaller than the diameters of the two ends of the conductor, so that the connection between the conductor and the insulator is more reliable and is not easy to deviate from;

4. the partial discharge value of the double-pass sleeve at 13.2kV is smaller than 5pC, and compared with the prior art, the partial discharge value is smaller, so that the service life is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a prior art assembly of a two-way sleeve with a cable and a current transformer.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a schematic structural diagram of the assembly of the double-pass sleeve with the cable and the current transformer in the utility model.

Fig. 4 is a side view of fig. 3.

Fig. 5 is a front view of the structure of the present utility model.

Fig. 6 is a cross-sectional view A-A of fig. 5.

Fig. 7 is a left side view of the structure of the present utility model.

Fig. 8 is a schematic structural diagram of an induction net according to the present utility model.

Reference numerals illustrate: a double-pass sleeve 1', a current transformer 2', a cable 3';

insulator 1, head 11, tail 12, disk 13, mounting 14, recess 15, conductor 2, inductive mesh 3, insert 4, current transformer 5, cable 6.

Detailed Description

The utility model will be described in detail below with reference to the attached drawings:

examples: as shown in fig. 3 to 8, the 10kV CT type double-pass bushing comprises an insulator 1, a head portion 11, a tail portion 12, a disc portion 13, a mounting portion 14, a groove 15, a conductor 2, an induction net 3 and an insert 4.

Referring to fig. 5 and 6, the insulator 1 is made of an epoxy resin material, the insulator 1 is molded on the outer periphery of the conductor 2 by casting with a mold, so that the outer periphery of the conductor 2 is completely covered by the insulator 1, and at the same time, the right end of the conductor 2 extends from the head 11 of the insulator 1 (only a small section is exposed), and the left end of the conductor 2 extends from the tail 12 of the insulator 1 (also only a small section is exposed). A disc portion 13 is formed on the outer wall of the right side of the insulator 1 near the head portion 11 through a die, and a mounting portion 14 is formed on the outer wall of the insulator 1 between the disc portion 13 and the tail portion 12. Preferably, the outer diameter of the disc portion 13 is larger than the outer diameter of the mounting portion 14, and the outer diameter of the mounting portion 14 is larger than the outer diameter of the tail portion 12. Further, as shown in fig. 3 and 4, the current transformers 5 are integrally formed, so that the same current transformer 5 can be sleeved on three (or more) insulators 1 (mounting portions 14) arranged in parallel. When the power distribution cabinet is arranged, the two-way sleeve and the current transformer can be integrally assembled, the installation and the disassembly are convenient, and meanwhile, wiring in the power distribution cabinet is concise and is not easy to wind.

Further, the induction net 3 is sleeved on the outer circumference of the conductor 2 (no mutual contact occurs), six (or other number of) inserts 4 are arranged along the outer circumference of the induction net 3, the inserts 4 adopt a nut-shaped structure, and the outer wall (nut head) of each insert 4 is electrically connected with the outer wall of the induction net 3. At the same time, the induction net 3 and the inserts 4 are relatively fixed in the insulator 1 by casting, and the mouth portion (the opening end of the nut) of each insert 4 is exposed from the end face of the disk portion 13 on the side close to the mounting portion 14. The induction net 3 plays a role in electrostatic shielding, and the part of the double-pass sleeve, which is uneven in high-voltage electric field, is shielded through the conductive induction net 3, so that the voltage equalizing effect is achieved, and the whole double-pass sleeve is easy to achieve a smaller partial discharge value after the electric field is even. Through practical use tests, the partial discharge value of the double-pass sleeve provided by the utility model at 13.2kV is smaller than 5pC. Partial discharge is a key factor affecting the life of the outlet sleeve, and smaller partial discharge values mean longer life.

Preferably, as shown in fig. 6 and 7, a groove 15 is formed on the end surface of the disc portion 13 near the mounting portion 14, the shape of the groove 15 matches with the outer contour of the disc portion 13, a sealing ring is placed in the groove 15, and the mouth of each insert 4 is located inside the groove 15.

Preferably, as shown in fig. 6, the diameter of the middle part of the conductor 2 is smaller than the diameters of the two ends of the conductor 2, so that the insulator 1 and the conductor 2 are not easy to fall off after being molded by casting.

The assembly process of the utility model comprises the following steps: referring to fig. 3 and 4, when assembling, the current transformer 5 is first integrally sleeved on the insulator 1 (the mounting portion 14) of the three double-pass sleeve, and after assembling, the outer edge of the current transformer 5 is approximately flush with the outer wall of the disc portion 13. The cable is then connected to the tail 12 of the insulator 1 and electrically connected to the exposed conductor 2. After all the assemblies are completed, the cables in the distribution box can be seen to be concise and not easy to wind, the current transformers are uniformly sleeved on the installation part, the assembly is neat and attractive, and the problem of sleeve leakage can be avoided. In the utility model, the induction net plays a role in electrostatic shielding, and the non-uniform part of the high-voltage electric field in the double-pass sleeve is shielded through the conductive induction net, so that the voltage equalizing effect is achieved, and the whole double-pass sleeve is easy to achieve a smaller partial discharge value after the electric field is uniform.

It should be understood that equivalents and modifications to the technical scheme and the inventive concept of the present utility model should fall within the scope of the claims appended hereto.

Claims

1. A 10kV CT type double-pass sleeve, characterized in that: the electric current transformer comprises an insulator (1), a conductor (2), an induction net (3) and an insert (4), wherein the insulator (1) is coated on the periphery of the conductor (2), one end of the conductor (2) extends out of a head part (11) of the insulator (1), the other end of the conductor (2) extends out of a tail part (12) of the insulator (1), a disc part (13) is formed on the outer wall, close to the head part (11), of the insulator (1), and a mounting part (14) is formed on the outer wall of the insulator (1) between the disc part (13) and the tail part (12) and is used for sleeving the electric current transformer (5); the induction net (3) is sleeved on the periphery of the conductor (2), a plurality of inserts (4) are arranged along the outer periphery of the induction net (3), each insert (4) is electrically connected with the outer wall of the induction net (3), the induction net (3) and the inserts (4) are fixed in the insulator (1), and the opening of each insert (4) is exposed from the end face of the disc part (13).

2. The 10kV CT type double pass sleeve according to claim 1, wherein: the mouth of each insert (4) is exposed from the end face of the disc part (13) on the side close to the mounting part (14).

3. The 10kV CT type double pass sleeve according to claim 2, wherein: the outer diameter of the disc part (13) is larger than that of the mounting part (14), and the outer diameter of the mounting part (14) is larger than that of the tail part (12).

4. A 10kV CT type double pass sleeve according to claim 3, characterized in that: the current transformers (5) are of an integrated structure, namely the same current transformer (5) is sleeved on the mounting parts (14) of at least three insulators (1) which are arranged in parallel.

5. The 10kV CT type double pass sleeve according to claim 4, wherein: a groove (15) is formed in the end face, close to one side of the mounting portion (14), of the disc portion (13), and the opening portion of each insert (4) is located inside the groove (15).

6. The 10kV CT bi-pass sleeve according to any of claims 1 to 5, characterized in that: the insulator (1) is made of epoxy resin material and is molded on the periphery of the conductor (2) in a casting mode.

7. The 10kV CT type double pass sleeve according to claim 6, wherein: the diameter of the middle part of the conductor (2) is smaller than the diameter of the two ends of the conductor.

8. The 10kV CT type double pass sleeve according to claim 7, wherein: the partial discharge value of the double-pass sleeve at 13.2kV is smaller than 5pC.