CN218482410U - Ground clamp for overhead ground wire of power transmission line - Google Patents

Abstract

The utility model discloses a ground clamp for overhead ground wire of power transmission line, including the ground clamp body that is L type, the ground clamp body includes installation department and connecting portion that integrated into one piece and mutually perpendicular set up, the installation department can be dismantled and connected on overhead ground wire, connecting portion can be dismantled and be connected with ground protection device; a first wire protecting strip is arranged between the inside of the mounting part and the overhead ground wire, the first wire protecting strip is wound on the overhead ground wire, and a second wire protecting strip is wound on the outside of the mounting part; the grounding protection device comprises an aluminum stranded wire, and crimping pieces are arranged at two ends of the aluminum stranded wire. The utility model increases the contact area with the overhead ground wire and reduces the grounding resistance value at the suspension point of the overhead ground wire; the aluminum stranded wire is additionally arranged to serve as a drainage wire, a prefabricated heating point is arranged, and the safety accidents that the wire clamp generates heat and the overhead ground wire is burnt and broken due to the fact that the resistance of the drainage position is increased are avoided.

Description

Ground clamp for overhead ground wire of power transmission line

Technical Field

The utility model relates to an overhead earth wire ground connection gold utensil technical field, concretely relates to transmission line is earth clamp for overhead earth wire.

Background

In the power transmission line, the difference of the suspension modes of the overhead ground wire corresponds to different grounding modes of the overhead ground wire. There are generally two types: one is that the suspension mode that the overhead earth wire is directly suspended on the tower is corresponding to the direct grounding mode from base to base; the other mode is a mode of suspension corresponding to a mode of connecting the overhead ground wire with a tower through an insulator and a mode of insulating the overhead ground wire from the ground.

However, the two grounding methods have the following defects: 1) When the overhead ground wire is in a base-by-base direct grounding mode, the clamp of the overhead ground wire can be heated when the overhead ground wire flows through induced current in the normal operation process, the self resistance of the clamp can be increased along with the rise of temperature due to the heating of the clamp, the mechanical performance and the service life of the clamp are seriously influenced, and if the clamp is damaged, the overhead ground wire falls off and is hung on the line to further cause serious short-circuit accidents; 2) The overhead ground wire adopts a mode of insulating from the ground, and if the load of the power transmission line is large in the normal operation process, higher induction voltage can be generated on the overhead ground wire. When the induction voltage reaches the discharge voltage of the insulator with the discharge gap, the discharge gap of the insulator can be punctured for a long time, and the arc existing for a long time generates higher temperature, so that the discharge gap discharges for a long time to generate overhigh temperature, the transmission loss of the optical fiber is increased, even the optical fiber is damaged, and the safe and reliable operation of a power grid is seriously threatened. In addition, the overhead ground wire insulated from the ground cannot share the ground short-circuit current flowing through the grounding device when a ground short-circuit occurs in the power plant or the substation. In a power plant and a transformer substation with a neutral point directly grounded, once a grounding short-circuit fault occurs, strong grounding short-circuit current can cause the ground potential of a grounding device to rise, larger contact voltage and step voltage can be generated, the safety and the stability of electrical equipment and a system can be directly damaged, and even the personal safety can be endangered.

Present overhead earth wire adopts parallel groove clamp to install additional the connection more, installs back induced-current additional and will follow the leakage current of ground resistance littleer, if meet parallel groove clamp bolt not hard up, during ground connection downlead line footpath did not match and the material does not match the circumstances such as, parallel groove clamp and overhead earth wire's area of contact reduces and leads to the contact resistance increase, and parallel groove clamp is inside to generate heat and takes place the galvanic corrosion phenomenon, easily causes overhead earth wire to burn disconnected strand, broken string scheduling problem.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a ground clamp for overhead ground wires of power transmission lines, which increases the contact area with the overhead ground wires and reduces the grounding resistance at the hanging point of the overhead ground wires; the aluminum stranded wire is additionally arranged to serve as a drainage wire, a prefabricated heating point is arranged, and the safety accidents that the wire clamp generates heat and the overhead ground wire is burnt and broken due to the fact that the resistance of the drainage position is increased are avoided.

The utility model provides a technical scheme as follows:

a grounding wire clamp for an overhead ground wire of a power transmission line comprises an L-shaped grounding wire clamp body, wherein the grounding wire clamp body comprises an installation part and a connection part which are integrally formed and are perpendicular to each other, the installation part is detachably connected to the overhead ground wire, and the connection part is detachably connected with a grounding protection device; a first line protection strip is arranged between the inside of the mounting part and the overhead ground wire, the first line protection strip is wound on the overhead ground wire, and a second line protection strip is wound on the outside of the mounting part; the grounding protection device comprises an aluminum stranded wire, and crimping pieces are arranged at two ends of the aluminum stranded wire.

Preferably, the connecting part is a cuboid handle, and a first through hole is formed in the connecting part; the second through hole is formed in the compression joint piece, and the aluminum stranded wire sequentially penetrates through the second through hole and the first through hole through bolts and is fixed to the first through hole and connected with the grounding wire clamp body.

Preferably, the first through hole and the second through hole are arranged in a circular or hexagonal shape.

Preferably, the mounting portion comprises a first clamp body and a second clamp body, one end of the first clamp body is movably connected with one end of the second clamp body, and the other end of the first clamp body is connected with the other end of the second clamp body in a buckling mode.

Preferably, the length of the first line protection strip is smaller than that of the second line protection strip.

Preferably, the first clamp body and the second clamp body are both arranged in a semi-circular arc shape.

Preferably, the other end of the first clamp body is connected with the other end of the second clamp body through a bolt.

The utility model has the advantages that:

1) The first protection line and the second protection line which are respectively wound on the overhead ground wire and at the ground wire clamp are used for preventing the suspension point of the overhead ground wire from being damaged due to vibration, ensuring the rigidity near the ground wire clamp to be enhanced, inhibiting the overhead ground wire from being bent and generating extrusion stress and abrasion due to vibration and improving the vibration resistance of the overhead ground wire;

2) The installation part of the grounding wire clamp body is arranged on the overhead ground wire and the handle is arranged, so that the contact area between the installation part and the overhead ground wire can be increased, and the grounding resistance value at the suspension point of the overhead ground wire is reduced;

3) The aluminum stranded wire is connected with the connecting part of the grounding wire clamp body, the arranged aluminum stranded wire is used as a drainage wire, the connecting part of the aluminum stranded wire and the grounding wire clamp body is used as a prefabricated heating point, and if the induced current is too large, the prefabricated heating point is the maximum position of the resistor, so that the effect of protecting the overhead ground wire can be achieved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic diagram of the first wire protection strip and the second wire protection strip of the present invention.

In the figure: 1. a ground clamp body; 101. an installation part; 102. a connecting portion; 2. a ground guard; 201. aluminum stranded wires; 202. a crimping piece; 203. a second through hole; 3. a first line protection strip; 4. a second line protection strip; 5. an overhead ground wire; 6. a first via.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

It should be noted that, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

Examples

As shown in fig. 1 to 2, the ground clamp for the overhead ground wire of the power transmission line comprises an L-shaped ground clamp body 1, wherein the ground clamp body 1 comprises an installation part 101 and a connection part 102 which are integrally formed and are perpendicular to each other, the installation part 101 is detachably connected to an overhead ground wire 5, and the connection part 102 is detachably connected to a grounding protection device 2; a first wire protecting strip 3 is arranged between the inside of the mounting part 101 and the overhead ground wire 5, the first wire protecting strip 3 is wound on the overhead ground wire 5, and a second wire protecting strip 4 is wound on the outside of the mounting part 101; the ground protection device 2 comprises an aluminum stranded wire 201, and crimping pieces 202 are arranged at two ends of the aluminum stranded wire.

As a further technical solution of this embodiment, the connecting portion 102 is a rectangular handle, and a first through hole 6 is formed thereon; the crimping piece 202 is provided with a second through hole 203, the aluminum stranded wire 201 sequentially penetrates through the second through hole 203 and the first through hole 6 through bolts and is fixed on the first through hole 6 to be connected with the ground clamp body 1, and the first through hole 6 and the second through hole 203 are convenient for the connection of the aluminum stranded wire 201 and the ground clamp body 1.

As a further technical solution of this embodiment, the first through hole 6 and the second through hole 203 are arranged in a circular or hexagonal shape, so as to expand the application range of the connecting member bolt and ensure quick connection.

As a further technical solution of this embodiment, the mounting portion 101 includes a first clip body and a second clip body, one end of the first clip body is movably connected to one end of the second clip body, and the other end of the first clip body is connected to the other end of the second clip body by a snap-fit connection.

As a further technical scheme of this embodiment, the length of first protecting line 3 is less than the length of second protecting line 4 guarantees the fastening connection of earth clamp body 1 and overhead earth wire 5, avoids leading to earth clamp body 1 to become flexible because of overhead earth wire 5 vibrations.

As a further technical scheme of this embodiment, first clamp and second clamp all set up and are the semicircle type, are consistent with overhead earth wire 5, are convenient for place fast and install, improve the installation effectiveness of earth clamp body 1.

As a further technical solution of this embodiment, the other end of the first clamp body is bolted to the other end of the second clamp body, which is convenient for disassembly and maintenance.

Utilize the utility model discloses an operating process of earth clamp as follows:

1) The first protection line 3 with the length of 500mm is wound at the hanging point of the overhead ground wire 5 and is used for preventing the ground wire clamp body 1 from being directly contacted with the overhead ground wire 5 to cause friction damage when the ground wire clamp body 1 is additionally arranged;

2) The grounding wire clamp body 1 is installed at a position aligning with the first protecting line 3, so that the grounding wire clamp body 1 is completely attached to the first protecting line 3;

3) Aligning the installed grounding wire clamp body 1, and winding a 700mm long second protection wire strip 4 on the surface of the grounding wire clamp body 1 along the length direction of the grounding wire clamp body 1 so as to tightly bind the grounding wire clamp body 1 and the second protection wire strip 4;

4) An aluminum stranded wire 201 with the length of 2000mm is used as a drainage wire, one end of the aluminum stranded wire 201 is fixedly connected to a connecting part 102, namely a handle, of the grounding wire clamp body 1 through a bolt, and the other end of the aluminum stranded wire is connected with the grounding end of a tower in a grounding mode.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and all the modifications and improvements made by those skilled in the art without departing from the principles and spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (7)

1. The ground clamp for the overhead ground wire of the power transmission line is characterized by comprising an L-shaped ground clamp body (1), wherein the ground clamp body (1) comprises an installation part (101) and a connection part (102) which are integrally formed and are perpendicular to each other, the installation part (101) is detachably connected to the overhead ground wire (5), and the connection part (102) is detachably connected with a grounding protection device (2);

a first line protection strip (3) is arranged between the inside of the mounting part (101) and the overhead ground wire (5), the first line protection strip (3) is wound on the overhead ground wire (5), and a second line protection strip (4) is wound on the outside of the mounting part (101);

the grounding protection device (2) comprises an aluminum stranded wire (201), and two ends of the aluminum stranded wire are provided with crimping pieces (202).

2. The ground clamp for the overhead ground wire of the power transmission line according to claim 1, wherein the connecting part (102) is a cuboid handle provided with a first through hole (6); the second through hole (203) is formed in the crimping piece (202), and the aluminum stranded wire (201) sequentially penetrates through the second through hole (203) and the first through hole (6) through bolts and is fixed to the first through hole (6) and connected with the grounding wire clamp body (1).

3. The ground clamp for the overhead ground wire of the power transmission line according to claim 2, wherein the first through hole (6) and the second through hole (203) are arranged in a circular or hexagonal shape.

4. The ground clamp for the overhead ground wire of the power transmission line according to claim 1, wherein the mounting portion (101) comprises a first clamp body and a second clamp body, one end of the first clamp body is movably connected with one end of the second clamp body, and the other end of the first clamp body is connected with the other end of the second clamp body in a buckling manner.

5. The ground clamp for the overhead ground wire of the power transmission line according to claim 1, wherein the length of the first guard bar (3) is smaller than the length of the second guard bar (4).

6. The ground clamp for the overhead ground wire of the power transmission line according to claim 4, wherein the first clamp body and the second clamp body are both arranged in a semicircular arc shape.

7. The ground clamp for the overhead ground wire of the power transmission line according to claim 4, wherein the other end of the first clamp body is bolted to the other end of the second clamp body.

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