CN216959314U

CN216959314U - Cable sheath protection device

Info

Publication number: CN216959314U
Application number: CN202220462522.3U
Authority: CN
Inventors: 史航; 王俊鹏
Original assignee: Baoding Zhengkai Cable Accessories Co ltd
Current assignee: Baoding Zhengkai Cable Accessories Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-07-12
Anticipated expiration: 2032-03-04

Abstract

The utility model discloses a cable sheath protection device, which comprises a cable sheath protector, a support frame and a separator, wherein the support frame is arranged on the support frame; the cable sheath protector is internally provided with a lead; the cable sheath protector comprises a high-voltage wiring terminal, a grounding terminal, an insulating sheath and an annular bulge arranged on the peripheral side of the insulating sheath; the bottom of the grounding end is provided with a separator. The annular bulge comprises a first annular bulge and a second annular bulge; the first annular bulge is arranged in the middle of the side wall of the insulating sheath; the second annular bulges are provided with at least one group and are symmetrically arranged relative to the first annular bulges; the cable sheath protector and the disconnector are arranged in a matched manner, and when the power frequency overvoltage or the impact overvoltage excessively impacts the cable sheath protector, the disconnector disconnects the grounding loop, so that the cable sheath is ensured not to pass through by circulating current.

Description

Cable sheath protection device

Technical Field

The utility model relates to the technical field of cable protection, in particular to a cable sheath protection device.

Background

The power cable with 35kV large cross section and the power cable with 66kV and 110kV and above voltage class are single-core cables, one end of the cable metal sheath is connected with three of the power cables in parallel and is grounded, the other end of the cable metal sheath is not grounded, when lightning waves or internal overvoltage flow along the cable core, the cable metal sheath can generate higher impact overvoltage without grounding end, or when system short-circuit accident current flows through the cable core, the cable metal sheath can also generate higher power frequency induction overvoltage without grounding end. The overvoltage can break down the insulation of the outer protective layer of the cable, so that multipoint grounding faults of the metal protective layer of the cable are caused, the normal operation of the power cable is seriously influenced, and the service life of the cable is even greatly reduced. Therefore, according to the regulations of the power industry standard DL/T401-2002 "high-voltage power cable selection guide", a sheath protector is adopted to limit the induced voltage and the fault overvoltage on the metal sheath (or metal sheath) of the power cable. When the existing cable sheath protection device is broken down again, the external appearance of the existing cable sheath protection device is unchanged, but the internal part of the existing cable sheath protection device is conductive and generates heat due to the generation of loop current, and finally accidents occur.

Therefore, there is a need to design a cable sheath protection device that can allow the worker to directly find the cable sheath protector is damaged during the maintenance and to perform timely and safe maintenance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cable sheath protection device, which solves the problems in the prior art, can cut off an annular loop through a disconnector when a fault occurs, further prevents accidents from occurring, and is convenient for workers to further cause personnel injury by accidents during maintenance.

In order to achieve the purpose, the utility model provides the following scheme: the present invention provides

The utility model discloses the following technical effects: the cable sheath protector and the disconnector are arranged in a matched manner, and when the power frequency overvoltage or the impact overvoltage excessively impacts the cable sheath protector, the disconnector breaks a grounding loop, so that the cable sheath is ensured not to pass through by circulating current, and meanwhile, a maintainer can find a fault and repair and replace parts in time; and the supporting frame is arranged to prevent the parts of the separator from falling off and accidentally injuring pedestrians, and the device has a practical structure, so that the use safety of the cable is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure;

FIG. 2 is a schematic view of the detacher;

wherein, 1, a cable sheath protector; 11. a high voltage terminal; 12. a ground terminal; 13. an insulating sheath; 14. a first annular projection; 15. a second annular projection; 16. an integral insulating cover; 2. a support frame; 21. a mounting frame; 22. a bottom fender bracket; 3. a separator; 31. a device body; 32. a threaded receptacle; 33. an elastic member; 34. a linear resistance sheet; 35. thermally exploding the projectile to shoot the nail; 36. an annular limiting plate; 4. a ground electrode; 5. a moisture-proof plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The utility model provides a cable sheath protection device, which comprises a lead, a cable sheath arranged outside the lead and a protection device arranged outside the cable sheath, wherein the protection device comprises a cable sheath protector 1, a support frame 2 and a separator 3; the cable sheath protector 1 is internally provided with a lead; the cable sheath protector 1 includes a high-voltage terminal 11, a ground terminal 12, an insulating sheath 13, and an annular projection mounted on the peripheral side of the insulating sheath 13;

the insulating sheath 13 penetrates through and is vertically arranged on the support frame 2, the high-voltage terminal 11 and the grounding terminal 12 are respectively arranged on two sides of the support frame 2; the disconnector 3 is mounted at the bottom of the ground terminal 12.

The annular protrusions include a first annular protrusion 14 and a second annular protrusion 15; the first annular bulge 14 is arranged in the middle of the side wall of the insulating sheath 13; the second annular projections 15 are provided in at least one set and are symmetrically arranged with respect to the first annular projections 14.

The first annular bulge 14 and the second annular bulge 15 are both arranged by inclining the top downwards, and the inclined angle between the first annular bulge and the horizontal plane is 2-5 degrees.

The radius of the second annular projection 15 is 1.5-2 times that of the first annular projection 14.

The supporting frame 2 comprises a mounting frame 21 and a bottom protection frame 22; the insulating sheath 13 penetrates through and is vertically arranged on the mounting frame 21; the mounting rack 21 is horizontally arranged, and the bottom of one end of the mounting rack 21 is fixedly connected with a bottom protection rack 22; the cross section of the bottom protection frame 22 is L-shaped; the detacher 3 is placed above the bottom guard 22.

The detacher 3 comprises a detacher body 31, wherein a threaded jack 32 is formed in the middle of the top surface of the detacher body 31; the grounding terminal 12 is inserted into the threaded insertion hole 32; an elastic piece 33, a linear resistor disc 34 and a thermal explosion ejection nail 35 are arranged below the threaded jack 32; the grounding electrode 4 is also arranged in the middle of the bottom surface of the device body 31; an annular limiting plate 36 is also fixedly arranged on the side wall of the inner cavity of the device body 31; the linear resistance sheet 34 corresponds to the annular limit plate 36 in position; the top surface of the linear resistance sheet 34 is fixedly connected with an elastic part 33, and the bottom surface of the linear resistance sheet 34 is fixedly connected with a thermal explosion bullet shooting nail 35; the thermal explosion ejection nail 35 is provided directly above the ground electrode 4.

The bottom of the inner cavity of the device body 31 is also fixedly provided with a damp-proof plate 5; the moisture-proof plate 5 is interposed between the thermal explosion projectile nail 35 and the ground electrode 4.

A protective shell is also mounted on the outside of the device body 31.

In this embodiment, the side wall of the ring-shaped limiting plate 36 is provided with a ring-shaped concave surface, which is adapted to the side wall of the linear resistor disc 34.

The cable sheath protector 1 adopts a high-energy large-section resistance card as a protection unit, a silicon rubber pressing outer sleeve is used as an insulating outer sleeve, and a plurality of annular bulges 13 are arranged outside the silicon rubber pressing outer sleeve.

Furthermore, the cable sheath protector 1 has the advantages of strong impact resistance, good protection characteristics, smoothness, beauty, pollution resistance, aging resistance, maintenance-free property and the like, can limit power frequency induced current in the metal sheath of the cable line, and can rapidly reduce power frequency overvoltage and impact overvoltage in the metal sheath of the cable line.

Connect integrative insulating cover 16 with high voltage connection end 11 in this embodiment, be connected with connecting wire and binding post on integrative insulating cover 14, compared and carried out structure integration in current sheath protector 1, made the easy installation of staff.

When the cable line is in a normal working state, the high-voltage cable sheath protector 1 is in a high-resistance state, and cuts off a power frequency induced current loop in the cable metal sheath; when a cable line has a ground fault, and a high power frequency overvoltage or an impact overvoltage occurs on a cable metal sheath due to lightning overvoltage or operation overvoltage, the high-voltage cable sheath protector 1 presents a low-resistance conduction state, so that impact current is quickly discharged to the ground through the cable sheath protector 1 to play a role in protecting the insulation of a cable outer sheath, and the separator 3 does not play a role; when the power frequency overvoltage or the impact overvoltage excessively impacts the cable sheath protector 1 to cause the cable sheath protector 1 to be broken down or burst, the disconnector instantaneously acts to disconnect a grounding loop, so that the cable sheath is ensured not to pass through by circulating current, and meanwhile, a maintainer can find out a fault and timely maintain and replace parts.

Furthermore, the disconnector 3 utilizes the flowing power frequency short circuit current to generate an electric arc in the disconnector, when the circuit is normal, the top of the thermal explosion ejection nail 35 is pressed against the bottom of the grounding terminal 12 by the elastic piece 33, and the grounding terminal 12, the elastic piece 33, the linear resistance sheet 34 and the thermal explosion ejection nail 35 in the disconnector form a communication circuit. When the voltage excessively impacts the cable sheath protector 1, the current is increased, and then the grounding end 12 generates heat through the current, so that the temperature of the linear resistance disc 34 rises, the temperature of the thermal explosion bullet shooting nail 35 rises along with the rise, gunpowder in the thermal explosion bullet shooting nail 35 generates thermal reaction, the bullet shooting nail at the front end of the thermal explosion bullet shooting nail 35 penetrates through the moisture-proof plate 5, and then the disconnector 3 is detonated, so that the disconnector 3 is in short circuit, and then the whole annular loop is disconnected, and the generation of loop current is prevented.

In this embodiment, the moisture-proof plate 5 prevents the explosive from being damped and deteriorated in the thermal explosion projectile nail 35.

In the present embodiment, the linear resistive patch 34 is a linear glass film resistive patch.

In this embodiment, the bottom guard 22 prevents parts from falling off and accidentally injuring pedestrians.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims

1. The utility model provides a cable sheath protection device, includes the wire, sets up the cable sheath in the wire outside with install the protection device in the cable sheath outside, its characterized in that: the protection device comprises a cable sheath protector (1), a support frame (2) and a separator (3); the conducting wires are arranged in the cable sheath protector (1); the cable sheath protector (1) comprises a high-voltage terminal (11), a grounding terminal (12), an insulating sheath (13) and an annular bulge arranged on the peripheral side of the insulating sheath (13);

the insulating sheath (13) penetrates through and is vertically arranged on the support frame (2), and the high-voltage wiring terminal (11) and the grounding terminal (12) are respectively arranged on two sides of the support frame (2); the bottom of the grounding end (12) is provided with the separator (3).

2. The sheath protection device of claim 1, wherein: the annular projection comprises a first annular projection (14) and a second annular projection (15); the first annular bulge (14) is arranged in the middle of the side wall of the insulating sheath (13); the second annular bulges (15) are provided with at least one group and are symmetrically arranged relative to the first annular bulges (14).

3. The sheath protection device of claim 2, wherein: the first annular bulge (14) and the second annular bulge (15) are both arranged by inclining downwards from the top, and the inclined included angle between the first annular bulge and the horizontal plane is 2-5 degrees.

4. The sheath protection device of claim 2, wherein: the radius of the second annular bulge (15) is 1.5-2 times of that of the first annular bulge (14).

5. The sheath protection device of claim 1, wherein: the supporting frame (2) comprises a mounting frame (21) and a bottom protection frame (22); the insulating sheath (13) penetrates through and is vertically arranged on the mounting frame (21); the mounting rack (21) is horizontally arranged, and the bottom protection rack (22) is fixedly connected to the bottom of one end of the mounting rack (21); the cross section of the bottom protection frame (22) is L-shaped; the separator (3) is arranged above the bottom protection frame (22).

6. The sheath protector of claim 1, wherein: the detacher (3) comprises a detacher body (31), wherein a threaded jack (32) is formed in the middle of the top surface of the detacher body (31); the grounding end (12) is inserted into the threaded jack (32); an elastic piece (33), a linear resistance sheet (34) and a thermal explosion bullet shooting nail (35) are arranged below the threaded jack (32); the middle part of the bottom surface of the device body (31) is also provided with a grounding electrode (4); an annular limiting plate (36) is fixedly arranged on the side wall of the inner cavity of the device body (31); the linear resistance sheet (34) corresponds to the annular limiting plate (36) in position; the elastic piece (33) is fixedly connected to the top surface of the linear resistance sheet (34), and the thermal explosion bullet shooting nail (35) is fixedly connected to the bottom surface of the linear resistance sheet (34); the thermal explosion bullet shooting nail (35) is arranged right above the grounding electrode (4).

7. The sheath protection device of claim 6, wherein: the bottom of the inner cavity of the device body (31) is also fixedly provided with a damp-proof plate (5); the moisture-proof plate (5) is arranged between the thermal explosion ejection nail (35) and the grounding electrode (4).

8. The sheath protection device of claim 7, wherein: and a protective shell is also arranged on the outer side of the device body (31).