CN102201651A - Anti-corona ball used for squirrel-cage rigid jumper device - Google Patents

Abstract

The invention provides an anti-halo ball for a squirrel-cage rigid wire jumper, which belongs to the field of overhead installation of electric wires or cables. The anti-halation ball of the present invention is suitable for being installed on the clamp of the spacer bar at the end of the squirrel-cage rigid jumper wire of a 750kV transmission line, and indirectly increases the radius of curvature of the contact part between the end of the spacer bar and the wire, so that it has a unique shape in appearance. The regular circular surface can effectively improve the distribution of the electric field intensity on the surface of the end of the spacer, suppress the occurrence of corona discharge at the end, reduce the corona noise and corona loss of the transmission line, and play the role of energy saving and noise reduction. The anti-coronavirus ball includes a hemispherical shell and bolts, and the bolts fasten the two hemispherical shells together in an embedded manner. The anti-halo ball of the present invention is small in size, light in weight, and easy to install, and does not need to disassemble other hardware components on the original circuit during installation, which is convenient for operation and maintenance.

Description

An anti-sickness ball used in a squirrel-cage rigid jumper

technical field

The invention belongs to the field of aerial installation of electric wires or cables, and in particular relates to an anti-sickness ball used for a squirrel-cage rigid jumper.

Background technique

Corona noise is produced by conductor partial discharge or corona, which is closely related to the level of voltage. If the voltage level is high and the electrical wiring is complicated, the higher the local field strength on the surface of the charged conductor, the easier it is for partial discharge or corona occur. The corona is generated because the uneven conductor produces an uneven electric field. Near the electrode with a small curvature radius around the uneven electric field, when the voltage rises to a certain value, the electric field strength on the surface of the electrode exceeds the breakdown strength of the air molecule. discharge, forming a corona. Corona consumes energy, and the pulsed electromagnetic waves generated by corona discharge will interfere with radio and high-frequency communications, and will also corrode the surface of the conductor, thereby reducing the service life of the conductor. At present, the electromagnetic environment has become an important factor that must be considered in the design, construction and operation of transmission lines.

The design and application conditions of charged metal fittings are related to their surface working field strength. When the surface working field strength is higher than the corona initiation field strength, corona discharge will be generated on the surface of the metal fittings. The size of the working field strength of the fittings is closely related to the structure of the fittings. Studies have shown that the smaller the curvature radius of the fittings surface, the higher the working field strength on the surface under the same voltage, the more likely corona discharge will occur at this place, resulting in electric shock. Halo noise and power loss are not conducive to energy saving and environmental protection.

Under the rated operating conditions of the transmission line, a large electric field intensity will be generated around the wire and fittings. Through the on-site measurement of corona and noise of some typical 750kV single-circuit transmission lines, it is found that corona discharge phenomenon of different degrees generally occurs on the spacer at the end of the middle-phase squirrel-cage rigid jumper. The reason is that there is a portion with a small curvature radius on the surface of the clamp of the spacer at the end, so that under the rated voltage, the electric field distortion on the surface is relatively serious, and the working field strength exceeds the corona initiation field strength, so corona discharge occurs , where the phenomenon of corona discharge is more serious.

At present, the method of preventing and treating corona is mainly realized through the special structural design of the squirrel-cage rigid jumper device. The scheme is: the jumper device fixes multiple multi-conductor split spacers and at least one suspension connector on the connecting pipe; the technical problems to be solved are: reducing line faults, preventing corona, improving the stability of the jumper, and reducing jumping. Improve the electrical performance and operational reliability of the power system. Another example is the authorized announcement number CN201252379Y, the utility model patent of the invention titled "UHV DC six-split squirrel-cage hard jumper device", the technical solution is: a six-split spacer bar is installed on the steel hoop, and the drainage line Through the six-split spacer bar, there is a soft jumper spacer bar on the drainage line, and the drainage line is fixed by the soft jumper spacer bar, and a suspension part is provided on the steel hoop; the jumper device has a simple structure and is Corona performance is good and so on.

The above-mentioned technology is mainly aimed at improving the structure of the wire jumper, and its improvement effect is limited.

Contents of the invention

In order to overcome the defects of the prior art, the present invention proposes a kind of anti-halation ball used for the spacer bar at the end of the squirrel-cage rigid jumper of 750kV transmission line. It has a regular circular surface, improves the distribution of the electric field intensity on the surface of the end of the spacer, suppresses the occurrence of corona discharge at the end, reduces the corona noise and corona loss of the transmission line, and plays the role of energy saving and noise reduction.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

An anti-corona ball for a squirrel-cage rigid jumper, the anti-corona ball includes a hemispherical shell and bolts; the improvement is that the interior of the anti-corona ball is hollow, and the hemispherical shell is provided with The wire outlet hole and the installation hole, the anti-halation ball is cast and formed by aluminum alloy material.

Another preferred technical solution of the present invention is: the bolts are threadedly connected to the hemispherical housing in an embedded manner.

Another preferred technical solution of the present invention is: the bolts are arranged in a triangle in the anti-halo ball.

Another preferred technical solution of the present invention is: the upper and lower ends of the hemispherical housing are provided with the wire outlet holes.

Another preferred technical solution of the present invention is: the diameter D2 of the wire outlet hole is 2-3 mm larger than the diameter of the wire.

Another preferred technical solution of the present invention is: the diameter D1 of the inner surface of the installation hole is larger than the size of the spacer wire clamp arm matched with it.

Another preferred technical solution of the present invention is that: the size of the hollow part of the anti-halation ball is larger than the size of the clamping part of the spacer rod matched with it.

Another preferred technical solution of the present invention is: the anti-halo ball is cast aluminum alloy according to GB 1173-1995, and is made of any type of aluminum alloy.

Owing to adopting above-mentioned technical scheme, compared with prior art, the beneficial effect of the present invention comprises:

1. Effectively suppress the phenomenon of corona discharge, play the role of energy saving and noise reduction

The radius of the outer surface of the hemispherical shell is R not less than 50mm, and the internal size is related to the size of the matching spacer. The hollow part is larger than the size of the spacer clamp head, and the size of D1 is larger than the arm size of the spacer clamp. , to ensure that the anti-halo ball can completely shield the clamp head, and will not exert additional pressure on the clamp arm; there are wire outlet holes at both ends of the spherical shell;

The design of the anti-corona ball makes the clamp completely shielded, indirectly increases the curvature radius of the clamp surface, makes the surface electric field evenly distributed, and can effectively suppress the corona discharge of the spacer bar at the end of the squirrel-cage rigid jumper of the 750kV transmission line; Prevention and treatment of noise and power loss due to corona;

2. Simple structure, small size, light weight, easy installation

The anti-corona ball of the present invention is composed of a hemispherical shell and bolts, and the bolts fasten the two hemispherical shells together in an embedded manner; the structure is simple, and there is no need to carry out other hardware components on the original circuit during installation. Disassembly, the anti-halation ball is cast from aluminum alloy material, the material is light; and the processing process of the anti-halation ball is optimized, and the production cost is low.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is the overall schematic diagram of the anti-halo ball;

Fig. 2 is a side view and a sectional view of an anti-sickness ball (hemisphere);

Fig. 3 is a top view and a sectional view of an anti-sickness ball (hemisphere);

Reference signs:

1-hemispherical shell, 2-bolt, 3-installation hole;

R represents the radius of the outer surface of the hemispherical shell, D1 represents the connection between the anti-corona ball and the clamp, D2 represents the diameter of the wire outlet hole, and φ represents the diameter of the bolt.

Detailed ways

The invention uses three-dimensional finite elements to establish a squirrel-cage rigid jumper simulation calculation model, and by analyzing the electric field distribution on the surface of the spacer at the end of the jumper, and taking appropriate optimization measures, a squirrel-cage rigid jumper end spacer is invented. Anti-halo ball. After the laboratory high-voltage corona test and the operation of hanging the net on the pilot line, the anti-corona ball has good anti-corona performance, which can effectively reduce the corona noise and corona loss of the line; The electromagnetic environment of transmission lines in high altitude areas plays a significant role.

Below in conjunction with specific embodiment, the anti-sickness ball of the present invention is further described:

Example 1:

As shown in Figure 1, the overall schematic diagram of the anti-sickness ball, the spherical shell, the interior is hollow, cast from aluminum alloy material, the anti-sickness ball can be divided into two parts: a hemispherical shell 1, and bolts 2. The side view and sectional view of the anti-sickness ball (hemisphere) are shown in Figure 2, and the top view and sectional view of the anti-sickness ball (hemispheric) are shown in Figure 3.

The radius R of the outer surface of the hemispherical shell 1 is not less than 50mm, and the internal size is related to the size of the matching spacer, wherein the hollow part is larger than the size of the spacer clamp head. The diameter D1 of the inner surface of the mounting hole 3 should be larger than the size of the arm of the spacer clamp to ensure that the anti-halation ball can completely shield the head of the clamp without exerting additional pressure on the arm of the clamp.

The upper and lower ends of the hemispherical housing 1 have wire outlet holes, and the diameter D2 of the wire outlet holes is 2-3mm larger than the diameter of the inserted wires. Usually the diameter of the wire outlet holes is 30-36mm.

There are three bolts 2 arranged in a triangle. The diameter of the bolt 2 is φ=21 mm, and the two hemispherical shells are fastened together by means of an embedded method.

Example 2:

The preparation material of anti-halation ball of the present invention can select ZL-102 aluminum alloy material for use, about ZL-102 aluminum alloy material, introduce as follows:

Material name: ZAlSi12

Alloy code: ZL102

Standard: GB/T 1173-1995

Features and scope of application:

It cannot be strengthened by heat treatment. The alloy has excellent casting performance, no hot cracking and loose tendency, and high air tightness. It has low density and good corrosion resistance. It can be used in environments subject to atmospheric and seawater corrosion, and can withstand the corrosion of concentrated nitric acid and hydrogen peroxide in industrial atmospheres. It also has good welding performance. However, the alloy has low mechanical properties, poor heat resistance and machinability.

chemical composition:

Silicon Si: 10.0-13.0

Aluminum Al: balance

Iron (sand casting): 0.000～0.700

Iron (metal mold casting): 0.000～1.000

Copper Cu: ≤0.30 (impurity)

Manganese Mn: ≤0.5 (impurity)

Magnesium Mg: 0≤0.10 (impurity)

Zinc Zn: ≤0.1 (impurity)

Titanium Ti: ≤0.20 (impurity)

Note: The sum of impurities: (sand casting) ≤ 2.0; (metal casting) ≤ 2.2

Mechanical properties:

Tensile strength σ _b (MPa): ≥145

Elongation δ ₅ (%): ≥4

Hardness (HB): ≥50(5/250/30)

Casting method:

Sand casting plus modification, metal casting plus modification, investment casting.

The invention has been described herein in terms of specific exemplary embodiments. Appropriate substitutions or modifications will be apparent to those skilled in the art without departing from the scope of the present invention. The exemplary embodiments are illustrative only, and not limiting of the scope of the invention, which is defined by the appended claims.

Claims (8)

1. an anti-stunning ball for squirrel-cage type rigid wire jumper, said anti-stunning ball comprises a hemispherical housing (1) and a bolt (2); it is characterized in that said anti-stunning ball is hollow inside, said The hemispherical shell (1) is provided with wire outlet holes and installation holes (3), and the anti-corona ball is cast and formed by aluminum alloy material. 2. An anti-corona ball for a squirrel-cage rigid wire jumper as claimed in claim 1, characterized in that the bolt (2) threads the hemispherical shell (1) in an embedded manner connect. 3. An anti-stunning ball for a squirrel-cage rigid wire jumper as claimed in claim 1, characterized in that said bolts (2) are arranged in a triangular shape in said anti-stunning ball. 4. An anti-halo ball for a squirrel-cage type rigid wire jumper as claimed in claim 1, characterized in that the upper and lower ends of the hemispherical shell (1) are provided with the wire outlet holes. 5. An anti-corona ball for a squirrel-cage rigid wire jumper as claimed in claim 1 or 4, characterized in that the diameter D2 of the wire outlet hole is 2-3 mm larger than the diameter of the wire. 6. An anti-halo ball for a squirrel-cage rigid jumper device according to claim 1, characterized in that the diameter D1 of the inner surface of the mounting hole (3) is larger than the spacer rod clamp arm matched with it size of. 7. An anti-coronavirus ball for a squirrel-cage type rigid wire jumper as claimed in claim 1, characterized in that the size of the hollow part of the anti-coronavirus ball is larger than the size of the collapsible part of the spacer. 8. A kind of anti-halo ball for squirrel-cage rigid wire jumper as claimed in claim 1, characterized in that said anti-halo ball is cast aluminum alloy according to GB 1173-1995, and adopts any type of aluminum alloy to make.

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