CN214314500U

CN214314500U - Grounding structure of cable terminal

Info

Publication number: CN214314500U
Application number: CN202022841603.8U
Authority: CN
Inventors: 张森; 吴伟权; 钟梓枫; 马超; 欧阳江
Original assignee: Dihai Optoelectronic Technology Co ltd
Current assignee: Dihai Optoelectronic Technology Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-09-28
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a grounding structure of a cable terminal, which comprises a first flange, a cable, a metal sheath, a tail pipe, a grounding terminal, a grounding cable, a grounding block and a flexible lead; the cable penetrates through the first flange, the metal sheath is sleeved on the outer wall of the cable, the metal sheath penetrates through the first flange, one end of the tail pipe is fixedly connected with the first end of the first flange, the tail pipe is sleeved outside the metal sheath, the other end of the tail pipe and the metal sheath are subjected to lead sealing treatment, the outer wall of the tail pipe is provided with a grounding lug, the grounding terminal is fixedly connected with the grounding lug, and the grounding cable is fixedly connected with the grounding terminal; the grounding block is arranged on the outer wall of the metal sheath, one end of the flexible lead is fixedly connected with the grounding block, and the other end of the flexible lead is fixedly connected with the grounding lug. According to the utility model discloses a ground structure at cable termination has further ensured the electric connection between metal sheath and the earth cable through grounding block and flexible conductor, can effectively prevent that metal sheath ground connection from becoming invalid, and the security is higher.

Description

Grounding structure of cable terminal

Technical Field

The utility model belongs to the technical field of the cable accessories technique and specifically relates to a ground structure at cable termination is related to.

Background

With the increase of urban power demand, power construction is in a rapid development stage, and crosslinked polyethylene insulated power cables with voltage levels of 66kV, 110kV, 220kV and the like are widely applied, so that rapid development of cable accessories is promoted. The cable outdoor termination is a major cable accessory by which underground cables can be securely connected to the high voltage transmission lines on the high voltage transmission towers.

Generally, the grounding process of the outdoor terminal of the cable is to seal and seal a tail pipe and a cable metal sheath, and then to make a grounding outgoing line on the tail pipe, so as to realize the electrical performance connection between the metal parts such as the tail pipe and a grounding electrode. Because the installation environment of the outdoor terminal of the cable is complex and is influenced by strong wind, rain corrosion, earth surface vibration and the like, the tail pipe and the metal sheath can be separated from each other to cause poor contact or virtual connection, so that the grounding failure of the cable terminal is caused, and the suspension discharge is generated to cause the cable fault. Furthermore, the connection between the tailpipe and the ground cable, if not secured, may also cause the tailpipe and metal jacket to fail to ground, thereby causing cable termination failure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a cable termination's ground structure can prevent effectively that objective reasons such as scene from arousing cable termination ground connection inefficacy, promotes cable termination's security and reliability.

According to the utility model discloses cable termination's ground structure, include: a first flange; the cable is arranged on the first flange in a penetrating way; the metal sheath is sleeved on the outer wall of the cable and penetrates through the first flange; one end of the tail pipe is fixedly connected with the first end of the first flange, the tail pipe is sleeved outside the metal sheath, the other end of the tail pipe is hermetically connected with the metal sheath, and the outer wall of the tail pipe is provided with a grounding lug; the grounding terminal is fixedly connected with the grounding lug; the grounding cable is fixedly connected with the grounding terminal; the grounding block is arranged on the outer wall of the metal sheath; one end of the flexible lead is fixedly connected with the grounding block, and the other end of the flexible lead is fixedly connected with the grounding lug.

According to the utility model discloses cable termination's ground structure has following beneficial effect at least: the grounding block is arranged on the outer wall of the metal sheath, and the metal sheath is electrically connected with the grounding lug through the flexible lead, so that the grounding reliability of the metal sheath is improved, and the grounding failure of the metal sheath can be prevented even if the virtual connection phenomenon occurs between the metal sheath and the tail pipe; moreover, because the flexible lead is flexible, the connection between the metal sheath and the grounding lug is not easy to be damaged, and even if the flexible lead has problems, the flexible lead is arranged outside the cable terminal, so that a worker can find and process the flexible lead in time; therefore, according to the utility model discloses cable termination's ground structure has effectively promoted the reliability of metal sheath ground connection to cable termination's security and reliability have been promoted.

According to some embodiments of the invention, the ground terminal is connected to the ground lug through at least two bolts.

According to some embodiments of the present invention, the heat-shrinkable tube is wrapped at the joint of the tail tube and the metal sheath.

According to some embodiments of the utility model, still include the cable oversheath, the cable oversheath is located metal sheath's outside.

According to some embodiments of the present invention, the two sides of the first flange are provided with a support insulator respectively.

According to some embodiments of the invention, the grounding cable and the connection of the grounding terminal are wound with a waterproof adhesive tape or an insulating self-adhesive tape.

According to some embodiments of the utility model, still include insulation support, insulation support is hollow structure, and inside packing has insulating medium, insulation support one end is fixed in the second end of first flange, the cable with metal sheath passes the part of first flange set up in inside the insulation support.

According to some embodiments of the present invention, a stress cone is disposed inside the insulating sleeve, and an upper portion of the stress cone is laid on the outer wall of the cable; the cone support sealing sleeve is sleeved outside the semi-conducting layer of the cable, the first end of the cone support sealing sleeve is in interference fit with the skirt portion of the stress cone, and the second end of the cone support sealing sleeve is fixedly connected with the second end of the first flange.

According to some embodiments of the invention, the junction of the semi-conducting layer of the cable and the metal sheath is provided with one or more of a filling compound, a semi-conducting tape, a copper mesh and a PVC insulating tape.

According to the utility model discloses a some embodiments, insulation support outer wall distributes along the axial has a plurality of outside convex full skirts, and is a plurality of the full skirt is big little staggered arrangement.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a grounding structure of a cable terminal according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of portion A shown in FIG. 1;

fig. 3 is an enlarged schematic view of a portion B shown in fig. 1;

reference numerals:

the cable comprises a first flange 100, a supporting insulator 110, an insulating sleeve 200, a shed 210, an insulating medium 300, a cable 400, a semi-conducting layer 410, a metal sheath 500, filling glue 510, a semi-conducting strip 520, a copper mesh 530, a PVC insulating strip 540, a tail pipe 600, a ground lug 610, a ground terminal 700, a bolt 710, a ground cable 800, waterproof adhesive tape 810, a ground block 900, a flexible wire 1000, a heat-shrinkable tube 1100, a cable outer sheath 1200, a stress cone 1300 and a cone support sealing sleeve 1400.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

As shown in fig. 1 and 2, the grounding structure of a cable terminal according to an embodiment of the present invention includes a first flange 100, a cable 400, a metal sheath 500, a tail pipe 600, a grounding terminal 700, a grounding cable 800, a grounding block 900, and a flexible conductor 1000; the cable 400 penetrates through the first flange 100, the metal sheath 500 is sleeved on the outer wall of the cable 400, the metal sheath 500 penetrates through the first flange 100, one end of the tail pipe 600 is fixedly connected with the first end of the first flange 100, the tail pipe 600 is sleeved outside the metal sheath 500, the other end of the tail pipe 600 is hermetically connected with the metal sheath 500, the outer wall of the tail pipe 600 is provided with a grounding lug 610, the grounding terminal 700 is fixedly connected with the grounding lug 610, and the grounding cable 800 is fixedly connected with the grounding terminal 700; the grounding block 900 is disposed on the outer wall of the metal sheath 500, one end of the flexible conductor 1000 is fixedly connected to the grounding block 900, and the other end is fixedly connected to the grounding lug 610.

Specifically, metal sheath 500 can play waterproof and zero sequence short-circuit current thermal stability's effect such as, can effectively prevent that cable 400's sinle silk from intaking to can be when cable 400 takes place the short circuit, lead to short-circuit current underground, avoid damaging cable 400, can effectively promote cable 400's life. One end of the tail pipe 600 may be fixedly connected to the lower end of the first flange 100 by bolts, and the joint of the tail pipe 600 and the metal sheath 500 may be sealed with lead or provided with copper braided wires, so that the lead sealing treatment may have good sealing and waterproof effects, and a grounding system may be formed between the metal sheath 500 and the grounding cable 800. However, if the cable terminal is affected by external environment, such as vibration of the ground surface, blowing of strong wind, etc., poor lead sealing, virtual connection, etc. may occur between the metal sheath 500 and the tail pipe 600, which may cause the grounding failure of the metal sheath 500, and the metal sheath 500 may cause suspension discharge to cause cable failure. The grounding block 900 is arranged on the outer wall of the metal sheath 500, and the electrical connection between the metal sheath 500 and the grounding lug 610 is realized through the flexible lead 1000, so that the grounding reliability of the metal sheath 500 can be further improved, and even if the virtual connection phenomenon occurs between the metal sheath 500 and the tail pipe 600, the grounding failure of the metal sheath 500 can be prevented; and since the flexible conductor 1000 is flexible, the connection between the metal sheath 500 and the ground lug 610 is not easily broken; even if a problem occurs with the pigtail 1000, since the pigtail 1000 is disposed outside the cable termination, the worker can find and handle it in time, unlike the problem of poor sealing.

Therefore, according to the utility model discloses cable termination's ground structure has further ensured the electric connection between metal sheath 500 and the earth cable 800 through grounding block 900 and flexible conductor 1000, not only can effectively prevent metal sheath 500 ground fault, can also in time discover and handle when flexible conductor 1000 goes wrong, and cable termination's security and reliability are higher.

The flexible lead can be made of copper or aluminum materials, preferably copper materials, and the copper conductor materials can effectively reduce the resistance; the conductor specification can be selected from 35, 50, 70, 95 and 120mm²Etc. may be selected according to the actual engineering.

As shown in fig. 2, the ground terminal 700 is fixedly connected to the ground lug 610 by at least two bolts 710. In this example, the ground terminal 700 is fixedly connected to the ground lug 610 through the two bolts 710, and the two bolts 710 are used for fixedly connecting, so that on one hand, the connection stability between the ground terminal 700 and the ground lug 610 is improved, on the other hand, the contact area between the ground terminal 700 and the ground lug 610 is increased, and the contact resistance can be effectively reduced. Of course, the number of the bolts 710 may be three, four, etc., without limitation.

As shown in fig. 2, the grounding structure of the cable terminal according to the embodiment of the present invention further includes a heat shrink tube 1100, and the heat shrink tube 1100 is wrapped at the connection portion of the tail tube 600 and the metal sheath 500. The heat-resistant performance of the heat-shrinkable tube 1100 is good, and the heat-shrinkable tube can also play roles of insulation, corrosion prevention, flame retardation and the like, and can effectively protect the cable 400. However, since the joint of the tail tube 600 and the metal sheath 500 is covered by the heat shrink tube 1100, the worker cannot visually observe the internal electrical connection condition, and the detection difficulty is high. Therefore, the grounding block 900 and the flexible lead 1000 are arranged on the outer wall of the metal sheath 500, so that the grounding effect of the metal sheath 500 can be visually observed and detected, and the metal sheath is convenient and reliable.

As shown in fig. 1, the grounding structure of the cable terminal according to the embodiment of the present invention further includes a cable sheath 1200, and the cable sheath 1200 is sleeved outside the metal sheath 500. Cable oversheath 1200 plays the effect of the insulating properties of reinforced cable 400, and protection cable 400 is difficult to receive mechanical damage simultaneously, and cable oversheath 1200 can make the insulating layer of cable 400 can not contact with water, air etc. avoids the insulating layer of cable 400 to wet.

As shown in fig. 1, the first flange 100 is provided at both sides thereof with insulating supports 110, respectively. In this example, the left and right sides of the first flange 100 are respectively provided with one supporting insulator 110, and the supporting insulator 110 may not only serve to increase a creepage distance, but also serve to support the electric wire and prevent the current from flowing back to the ground. It is to be understood that the number of supporting insulators 110 is not limited.

As shown in fig. 2, a waterproof tape 810 or an insulating self-adhesive tape is wound around a joint of the ground cable 800 and the ground terminal 700. The waterproof performance of waterproof sticky tape 810 or insulating self-adhesive tape is better, can effectively prevent that the sinle silk of earth cable 800 from intaking, plays fine waterproof and sealing action to earth cable 800 and ground terminal 700.

As shown in fig. 1, according to the grounding structure of the cable terminal of the embodiment of the present invention, the grounding structure further includes an insulation sleeve 200, the insulation sleeve 200 is a hollow structure, the inside is filled with an insulation medium 300, one end of the insulation sleeve 200 is fixed to the second end of the first flange 100, and the cable 400 and the metal sheath 500 are disposed inside the insulation sleeve 200 through the portion of the first flange 100. Specifically, the insulating medium 300 may be natural mineral oil, silicon oil, trichlorobiphenyl, or the like, and the insulating sleeve 200 may be an epoxy silicone rubber sleeve, a porcelain sleeve, or the like. The insulation sleeve 200 functions to insulate and protect the cable 400. The bottom of the insulating sleeve 200 may be fixedly coupled to the upper end of the first flange 100 using fastening bolts.

As shown in fig. 1, according to the utility model discloses cable termination's ground structure, still include stress cone 1300 and awl support seal cover 1400, stress cone 1300 sets up inside insulation support 200, and the outer wall of cable 400 is laid on stress cone 1300's upper portion, and the outside of the semi-conducting layer 410 of cable 400 is located to awl support seal cover 1400 cover, and the first end that awl held in the palm seal cover 1400 and stress cone 1300's skirt portion interference fit, awl hold in the palm the second end of seal cover 1400 and the second end fixed connection of first flange 100. Through setting up stress cone 1300 and awl support seal cover 1400, can prevent effectively that insulating medium 300 from outwards leaking and leading to the cable terminal oil leak along the sinle silk of cable 400, effectively avoided the oil leak problem at cable terminal, promoted cable terminal's security and reliability.

As shown in fig. 3, the junction of the semiconductive layer 410 and the metal sheath 500 of the cable 400 is provided with one or more of a filler paste 510, a semiconductive tape 520, a copper mesh 530, and a PVC insulation tape 540. In this example, the filling glue 510 is laid on the chamfer of the junction of the semi-conductive layer 410 and the metal sheath 500, and then the semi-conductive tape 520, the copper mesh 530, the PVC insulating tape 540 and the like are wound on the outer layer, so as to fill and equalize the electric field, and effectively prevent the electric field from being broken down in the cable 400, thereby prolonging the service life of the cable 400. Of course, the order and kinds of the placement of the potting adhesive 510, the semi-conductive tape 520, the copper mesh 530 and the PVC insulation tape 540 are not limited.

As shown in fig. 1, a plurality of outwardly protruding sheds 210 are axially distributed on the outer wall of the insulating sleeve 200, and the sheds 210 are arranged in a staggered manner. The umbrella skirt 210 is arranged on the outer wall of the insulating sleeve 200, so that the creepage distance can be effectively increased, high-voltage discharge is prevented, and the electrical performance of the oil-filled cable terminal is better and safer; the sheds 210 and the insulating sleeves 200 are integrally formed, and the sheds 210 are arranged in a large-to-small staggered manner, so that the mechanical strength of the sheds 210 is improved, and the creepage effect of the sheds 210 is improved.

In the description herein, references to the description of the term "one embodiment," "a further embodiment," "some specific embodiments," or "some examples," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A grounding structure for a cable termination, comprising:

a first flange;

the cable is arranged on the first flange in a penetrating way;

the metal sheath is sleeved on the outer wall of the cable and penetrates through the first flange;

one end of the tail pipe is fixedly connected with the first end of the first flange, the tail pipe is sleeved outside the metal sheath, the other end of the tail pipe is hermetically connected with the metal sheath, and the outer wall of the tail pipe is provided with a grounding lug;

the grounding terminal is fixedly connected with the grounding lug;

the grounding cable is fixedly connected with the grounding terminal;

the grounding block is arranged on the outer wall of the metal sheath;

one end of the flexible lead is fixedly connected with the grounding block, and the other end of the flexible lead is fixedly connected with the grounding lug.

2. The grounding structure of a cable termination of claim 1, wherein the grounding terminal is fixedly connected to the grounding lug by at least two bolts.

3. The grounding structure of the cable termination according to claim 1 or 2, further comprising a heat-shrinkable tube, wherein the heat-shrinkable tube is wrapped around a junction of the tail tube and the metal sheath.

4. The grounding structure of a cable terminal according to claim 1, further comprising a cable outer sheath provided outside the metal sheath.

5. The grounding structure of a cable terminal according to claim 1, wherein the first flange is provided at both sides thereof with insulating supporters, respectively.

6. The grounding structure of a cable terminal according to claim 1, wherein a joint of the grounding cable and the grounding terminal is wrapped with a waterproof tape or an insulating self-adhesive tape.

7. The grounding structure of a cable termination according to claim 1, further comprising an insulating sleeve, wherein the insulating sleeve is a hollow structure, the inside of the insulating sleeve is filled with an insulating medium, one end of the insulating sleeve is fixed to the second end of the first flange, and the cable and the metal sheath are disposed inside the insulating sleeve through a portion of the first flange.

8. The grounding structure of a cable termination according to claim 7, further comprising:

the stress cone is arranged in the insulating sleeve, and the upper part of the stress cone is laid on the outer wall of the cable;

the cone support sealing sleeve is sleeved outside the semi-conducting layer of the cable, the first end of the cone support sealing sleeve is in interference fit with the skirt portion of the stress cone, and the second end of the cone support sealing sleeve is fixedly connected with the second end of the first flange.

9. The grounding structure of a cable terminal according to claim 8, wherein a junction of the semi-conductive layer of the cable and the metal sheath is provided with one or more of an underfill, a semi-conductive tape, a copper mesh, and a PVC insulating tape.

10. The grounding structure of a cable terminal according to claim 7, wherein a plurality of sheds protruding outwards are axially distributed on the outer wall of the insulating sleeve, and the sheds are staggered from one large to another.