CN217903994U

CN217903994U - Medium-voltage cable intermediate head

Info

Publication number: CN217903994U
Application number: CN202222261422.7U
Authority: CN
Inventors: 侯尧鹏; 侯亚彤
Original assignee: Shijiazhuang Anep Cable Accessories Co ltd
Current assignee: Shijiazhuang Anep Cable Accessories Co ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2022-11-25
Anticipated expiration: 2032-08-26

Abstract

The utility model discloses a middling pressure cable intermediate head, including stress tube, cavity formula inner electrode, main insulating cover, conducting layer, conductor connecting pipe and conducting strip, the middling pressure cable is provided with two, the middling pressure cable is including cable outer shielding layer, cable main insulation and cable guide core, the fixed cover in inboard of main insulating cover is equipped with cavity formula inner electrode, four conducting strips of equidistance fixedly connected with on the circumferencial direction are followed to the inboard of cavity formula inner electrode, the inboard of cavity formula inner electrode is provided with the conductor connecting pipe, and the stress tube not only can evacuate middle voltage cable in cable outer shielding layer port concentrated electric field, can also evacuate the concentrated electric field of cavity formula inner electrode port, plays dual sparse effect, improves the quick sparse efficiency of concentrated electric field, greatly reduced because of the inner electrode port has the hidden danger that concentrated electric field brought, simple convenient reaching is protected the junction of two cables.

Description

Medium-voltage cable intermediate head

Technical Field

The utility model relates to a cable intermediate head specifically is a medium voltage cable intermediate head.

Background

The existing intermediate joint of the medium-voltage power cable mainly recovers the insulation and shielding functions of the cable connection part in a 1, stress cone form and a 2, welding form, but the intermediate joints of the two forms have different defects respectively, and the intermediate connections of the two forms are analyzed respectively as follows: (1) The stress cone type intermediate joint is composed of a stress cone, an inner electrode, a main insulator and an outer shield, wherein the stress cone is used for evacuating a concentrated electric field at the port of the outer shield of the cable, the design basic requirement of the stress cone is that (1) the material for manufacturing the stress cone must have good conductivity (the performance of the current material is basically up to standard), (2) the geometric shape of the stress cone must be in one-to-one correspondence with the outer diameter of the main insulator of the cable (the outer diameters of the cable insulators of the current cable manufacturers are different and are not easy to realize; even if the cable manufacturers achieve the uniform standard, the current intermediate joint of the cable is used in a cross-line diameter, the requirement cannot be basically realized), (3) the stress cone must be in concentric axial symmetry with the cable core and the main insulator (the requirement is difficult to realize due to the deviation of the process of each link); (4) the inner electrode is used for contacting with a metal connecting pipe at the joint of the cable conductor, and extends high potential to the surface of the inner electrode, so that the concentrated electric field on the irregular surface of the metal connecting pipe and the wire core can be effectively shielded, but the concentrated electric field can be formed at two ports of the inner electrode. (the failure rate here is currently more than 60% of all the intermediate head failure rates). (2) The utility model provides a cable, including the cable body structure, the cable body structure is used for the tape, the intermediate head of butt fusion form, this kind of intermediate head designs and is under construction with the theory of recovering cable body structure, the connection of cable conductor adopts the welded form to resume for guaranteeing that the volume of junction is not too big and the circularity, but need high temperature melting metal at the welded in-process, because the heat conductivity of metal is better, the heat can transmit the inside fracture that makes originally intact cable take place the molecular bond of cable, it utilizes the tape similar with cable main insulation to carry out the manual winding postheating crosslinked method to resume when recovering main insulation. However, the belt material cannot be completely crosslinked into a whole with the material identical to the material of the cable body (for example, the polyethylene material has different molecular weights); the force of head pressure (> 20 Mpa) in cable production cannot be achieved even when ensuring that no impurities enter during manual winding, which significantly compromises the performance of the material.

It is therefore essential to achieve a rapid evacuation of the concentrated electric field of the medium voltage cable connection ports by means of a simple structure, for which purpose a medium voltage cable intermediate joint is proposed which is optimized.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medium voltage cable intermediate head to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a medium voltage cable intermediate head, includes main insulating cover and medium voltage cable, its characterized in that: the medium voltage cable is provided with two, the core is led including cable external shield, cable main insulation and cable to the medium voltage cable, the fixed cover in inboard of main insulating cover is equipped with cavity formula inner electrode, four conducting strips of equidistance fixedly connected with on the circumferencial direction are followed to cavity formula inner electrode's inboard, the inboard of cavity formula inner electrode is provided with the conductor connecting pipe, and the both ends inboard of main insulating cover all is equipped with stress tube, two the inboard of the stress tube that main insulating cover both ends were located to cable external shield, cable main insulation and cable guide core in the medium voltage cable overlap respectively, two cable guide in the cable is led the core respectively with the both ends fixed connection of conductor connecting pipe.

As a further aspect of the present invention: the conductive sheet is in contact with the outer side of the conductor connecting pipe.

As a further aspect of the present invention: the outer wall of the cable outer shielding layer is attached to a part of the inner wall of the stress tube.

As a further aspect of the present invention: the cavity type inner electrode and the conducting strip are made of conductive rubber.

As a further aspect of the present invention: the main insulating sleeve is made of insulating rubber.

Compared with the prior art, the beneficial effects of the utility model are that:

1. through the cooperation setting of stress tube, cavity formula inner electrode, main insulating cover, conducting layer, conductor connecting pipe and conducting strip, the concentrated electric field of cable outer shield layer port in the medium voltage cable not only can be evacuated to the stress tube, the concentrated electric field of cavity formula inner electrode port can also be evacuated, plays dual sparse effect, greatly reduced because of the hidden danger that the concentrated electric field brought exists in the inner electrode port, simple convenient reaching is protected the junction of two cables.

2. The four conducting strips are arranged inside the cavity type inner electrode and can be in contact with the conductor connecting pipe, so that the cavity type inner electrode can be in good contact with the connecting pipe, and an equipotential body is formed inside the cavity type inner electrode.

Drawings

Fig. 1 is a schematic structural view of a middle joint of a medium voltage cable.

Fig. 2 is a partial cross-sectional view in a medium voltage cable intermediate joint.

Shown in the figure: stress tube 1, cavity formula inner electrode 2, main insulating cover 3, conducting layer 4, cable external shield 5, cable main insulation 6, cable lead core 7, conductor connecting pipe 8, conducting strip 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Please refer to fig. 1-2, in the embodiment of the utility model, a medium voltage cable intermediate head, including main insulating cover 3 and medium voltage cable, medium voltage cable is provided with two, for medium voltage cable among the prior art, medium voltage cable is including cable external shield 5, cable main insulation 6 and cable guide core 7, the inboard fixed cover of main insulating cover 3 is equipped with cavity formula inner electrode 2, equidistant four conducting strips 9 of equidistance fixedly connected with are followed to the inboard of cavity formula inner electrode 2, the inboard of cavity formula inner electrode 2 is provided with conductor connecting pipe 8, and the effectual cavity formula inner electrode 2 that has guaranteed keeps good contact with conductor connecting pipe 8, and the both ends inboard of main insulating cover 3 all is equipped with stress tube 1, two cable external shield 5, cable main insulation 6 and cable guide core 7 in the medium voltage cable overlap the inboard of stress tube 1 who locates main insulating cover 3 both ends respectively.

And cable guide cores 7 in the two cables are respectively and fixedly connected with two ends of a conductor connecting pipe 8.

The conductive plate 9 is in contact with the outside of the conductor connecting tube 8.

The outer wall of the cable outer shielding layer 5 is attached to a part of the inner wall of the stress tube 1.

The outer side of the main insulating sleeve 3 is provided with a conducting layer 4, and the conducting layer 4 is made of conducting ink, so that the conducting effect of subsequent grounding is guaranteed.

The cavity type inner electrode 2 and the conducting strip 9 are made of conducting rubber.

The main insulating sleeve 3 is made of insulating rubber.

The main insulating sleeve 3 is designed in a streamline mode, so that the power line is smoother.

The stress tube 1 is made of a high dielectric material.

The utility model discloses a theory of operation is:

when the middle-voltage cable middle joint is used for connecting two middle-voltage cables, the two middle-voltage cables are peeled to expose the cable outer shielding layer 5, the cable inner sheath 6 and the cable guide core 7, the length is in accordance with the connection requirement, the middle-voltage cables are connected in the mode of the figure 1, the concentrated electric field at the port of the cable outer shielding layer 5 in the middle-voltage cables can be dispersed, the concentrated electric field at the port of the cavity type inner electrode 2 can be also dispersed, the dual-dispersion effect is achieved, the hidden danger caused by the concentrated electric field existing at the port of the inner electrode is greatly reduced, the stress tube 1 is used for achieving the dispersion effect of the concentrated electric field through the special electrical performance of materials, the stress tube has certain containment capacity on the roundness and eccentricity of the cables, the four conductive sheets 9 arranged inside the cavity type inner electrode 2 can be in contact with the conductor connecting tube 8, the cavity type inner electrode 2 can be in good contact with the connecting tube 8, an equipotential body is formed inside the cavity type inner electrode 2, the design of the cavity type inner electrode ensures that the conductor parts can be connected in multiple modes and have enough large space, the middle-voltage cable middle-connection operation can not be deformed, and the middle-voltage cable can be conveniently connected without the middle-voltage cable.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a medium voltage cable intermediate head, includes main insulating cover (3) and medium voltage cable, its characterized in that: medium voltage cable is provided with two, medium voltage cable leads core (7) including cable external shield (5), cable main insulation (6) and cable, the fixed cover of inboard of main insulation cover (3) is equipped with cavity formula inner electrode (2), equidistant four conducting strips (9) of equidistance fixedly connected with along the circumferencial direction in the inboard of cavity formula inner electrode (2), the inboard of cavity formula inner electrode (2) is provided with conductor connecting pipe (8), and the both ends inboard of main insulation cover (3) all is equipped with stress tube (1), two cable external shield (5), cable main insulation (6) and cable in the medium voltage cable lead core (7) overlap respectively locate the inboard of stress tube (1) at main insulation cover (3) both ends, two cable in the cable leads core (7) respectively with the both ends fixed connection of conductor connecting pipe (8).

2. The medium voltage cable intermediate joint according to claim 1, characterized in that: the conducting strip (9) is contacted with the outer side of the conductor connecting pipe (8).

3. The medium voltage cable intermediate joint according to claim 1, characterized in that: the outer wall of the cable outer shielding layer (5) is attached to a part of the inner wall of the stress tube (1).

4. The medium voltage cable intermediate joint according to claim 1, characterized in that: the cavity type inner electrode (2) and the conducting strip (9) are made of conducting rubber.

5. The medium voltage cable intermediate joint according to claim 1, characterized in that: the main insulating sleeve (3) is made of insulating rubber.