CN203859480U - Novel lightning protection structure for overhead high voltage transmission line - Google Patents

Abstract

The utility model provides a novel lightning protection structure for an overhead high-voltage transmission line, which is characterized in that it is composed of a composite material cross arm, a live conductor, a ground conductor and a discharge gap h; the live conductor is a metal straight pipe with one end fixed to a pole tower, The grounding conductor is a metal straight tube that is L-shaped and one end of which is fixed on the high-voltage end fittings of the composite material cross arm. The discharge gap h is formed between the floating end of the charged conductor and the floating end of the grounding conductor. The composite material cross arm, grounding The conductor and the live conductor are on the same plane, which is parallel to the ground plane, or the high-voltage end is inclined upward to form an angle of no more than 30° with the ground plane. The lightning protection structure can effectively avoid lightning accidents on overhead high-voltage transmission lines, and at the same time can improve the anti-pollution flashover and anti-ice flashover levels of the lines, reduce the height of towers, reduce the width of line corridors, and save line construction costs.

Description

A New Lightning Protection Structure for Overhead High-Voltage Transmission Lines

technical field

The utility model relates to the technical field of overhead high-voltage transmission lines, in particular to a novel lightning protection structure for overhead high-voltage transmission lines.

Background technique

The current overhead high-voltage transmission conductors are usually suspended at the lower end of the suspension insulator string fixed at the end of the steel cross-arm. Usually, the lightning protection of this kind of transmission line is mainly realized by erecting a lightning protection line above a certain distance from the conductor. Since the lightning conductor is above the wire, most of the lightning strikes the lightning conductor, thereby protecting the conductor from being struck by lightning. However, most of the overhead high-voltage transmission lines in my country are located in a relatively complex geographical environment, and the operating conditions are relatively complex, which may cause the lightning conductor to fail to effectively protect the conductor from lightning strikes. , so that the wires are placed out of the protection angle range of the lightning conductor, the wires may be struck by lightning. In addition, lightning has various forms such as direct lightning strike, circumventing lightning strike, and counterattack lightning strike. accounted for a considerable proportion.

Contents of the invention

Aiming at the above problems, the utility model aims to provide a new type of lightning protection structure for overhead high-voltage transmission lines. The lightning protection structure can effectively avoid lightning accidents on overhead high-voltage transmission lines, and at the same time improve the anti-pollution flashover and anti-ice flashover levels of the lines. Reduce the height of the pole tower, reduce the width of the line corridor, and save the cost of line construction.

In order to achieve the above object, the utility model provides a new type of lightning protection structure for overhead high-voltage transmission lines, which is characterized in that it is composed of a composite material cross arm, a live conductor, a ground conductor and a discharge gap h; the live conductor is a metal straight pipe and its One end is fixed on the pole tower, the grounding conductor is a metal straight tube that is L-shaped and one end is fixed on the high-voltage end fittings of the composite material cross-arm, and the discharge gap h is formed between the floating end of the live conductor and the floating end of the grounding conductor. The cross arm of the material, the grounding conductor and the live conductor are on the same plane, and the plane is parallel to the ground plane, or the high-voltage end is inclined upward to form an included angle not higher than 30° with the ground plane.

The novel lightning protection structure for overhead high-voltage transmission lines as described above is characterized in that the axis of the composite material cross-arm is parallel to the lightning discharge gap h, and the included angle with the ground plane is 0°~30°. the

The novel lightning protection structure of the overhead high-voltage transmission line as described above is characterized in that the distance L between the shed of the composite cross arm and the discharge gap h is not less than 500 mm.

The novel lightning protection structure for overhead high-voltage transmission lines as described above is characterized in that the grounding conductor and the charged conductor are made of metal materials, and the discharge end can be made into a ball, tip or needle.

Compared with the prior art, the utility model has the following advantages: the lightning protection structure is generally installed horizontally on the pole tower or the high-voltage end is installed obliquely upwards, and the angle formed between the cross arm and the ground plane is not higher than 30° when installed obliquely upwards. The self-cleaning and anti-icing performance of insulators installed horizontally or inclined upward at a small angle is better than that of vertically installed insulators, which is not easy to cause pollution and ice flash, and can improve the safety of transmission lines. In addition, since the wires are directly hung at the end of the cross-arm made of composite materials, it will not form wind deflection like the suspension insulators, which can reduce the width of the line corridor and effectively reduce the cost of land acquisition for line construction. Cost and basic costs.

Description of drawings

Fig. 1 is the structural diagram of the novel lightning protection structure of the overhead high-voltage transmission line of the present invention;

Among them: 1—composite material cross arm, 2—charged conductor, 3—grounding conductor, 4—iron tower, 5—conductor, h—discharge gap, H—length of cross arm, L—distance between discharge gap and cross arm shed.

Detailed ways

In order to better understand the utility model, the content of the utility model is further explained below in conjunction with the examples, but the content of the utility model is not limited to the following examples. Those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms are also within the scope of the claims listed in the application.

As shown in Figure 1, the new lightning protection structure of the overhead high-voltage transmission line provided by the utility model is composed of a composite material cross arm 1, a charged conductor 2, a grounding conductor 3 and a discharge gap h. The live conductor 2 is a straight metal tube with one end fixed on the pole tower, the grounding conductor 3 is a straight metal tube in an L shape and one end is fixed on the high-voltage end hardware of the composite material cross arm 1 . A discharge gap h is formed between the floating end of the charged conductor 2 and the floating end of the grounding conductor 3 . Composite material cross arm 1, grounding conductor 2 and live conductor 3 are on the same plane, and the plane is parallel to the ground plane, or the high voltage end is inclined upward to form an angle not higher than 30° with the ground plane.

The distance of the discharge gap h between the live conductor 2 and the ground conductor 3 is determined according to the two technical parameters of the composite material crossbar in actual operation. It should meet: (1) The power frequency withstand voltage on the discharge gap h is not less than the power frequency withstand voltage of the composite material cross arm 1; (2) The lightning impulse discharge voltage on the discharge gap h is not greater than (1-3δ) composite Material cross-arm lightning impulse discharge voltage (δ is the standard deviation).

The axis of composite material cross arm 1 is parallel to the lightning discharge gap h, and the included angle with the ground plane is 0°~30°.

In order to avoid the discharge arc from burning the composite cross-arm shed, the distance L between the discharge gap h and the cross-arm shed should not be less than 500mm.

The grounding conductor 2 and the charged conductor 3 are made of metal materials, and their discharge ends can be made into a ball shape, a tip shape or a needle shape.

In order to ensure the stability of the discharge gap h and the safety of the wires, the bending mechanical load of the composite material cross arm 1 should not be less than twice the weight of the wire when the maximum ice is covered. When the line is in normal operation, the maximum deformation of the composite material cross arm should not be less than 1% of the length H.

The lightning protection structure is generally installed horizontally on the pole tower or the high-pressure end is installed obliquely upward, and the angle formed by the cross arm and the ground plane is not higher than 30° when installed obliquely upward. The self-cleaning and anti-icing performance of insulators installed horizontally or inclined upward at a small angle is better than that of vertically installed insulators, which is not easy to cause pollution and ice flash, and can improve the safety of transmission lines.

Referring to the accompanying drawings, fabricate and assemble a new type of lightning protection structure for overhead high-voltage transmission lines in the following order:

(1) According to the general composite material cross-arm production method, produce composite material cross-arms that meet the mechanical strength requirements;

(2) Make a live conductor 3, and weld a Φ100mm metal ball at one end of a Φ30mm metal tube. After being bent into a 90° right angle according to the required size, the other end is connected to the high-voltage end fittings of the composite cross-arm;

(3) Make the grounding conductor 2, weld a Φ100mm metal ball at one end of the Φ30mm metal pipe, and weld the connecting seat at the other end of the metal pipe, and the connecting seat is provided with a bolt hole for connecting with the tower;

(4) Bolt the metal attachment of the grounding end of the composite cross-arm to the tower so that it is parallel to the ground plane, or the high-voltage end is inclined upward to form an angle of no more than 30° with the ground plane, and the metal attachment of the high-voltage end of the cross-arm The accessory is equipped with a boat-shaped clamp for fixing the wire;

(5) Adjust the grounding conductor to the same straight line as the live conductor, and adjust the distance of the discharge gap h between the two, and fix the grounding conductor on the tower with bolts;

(6) During the installation process, the axes of composite material cross arm 1, grounding conductor 2 and live conductor 3 are on the same plane, which is parallel to the ground plane, or the high-voltage end is inclined upward to form an angle not higher than 30° with the ground plane. angle.

Claims (4)

1. A new type of lightning protection structure for overhead high-voltage transmission lines, which is characterized in that it is composed of a composite material cross arm (1), a charged conductor (2), a grounding conductor (3) and a discharge gap h; the charged conductor (2) is a metal straight The grounding conductor (3) is a metal straight tube that is L-shaped and one end is fixed on the high-voltage end hardware of the composite material cross arm (1), and the floating end of the live conductor (2) and the grounding conductor The discharge gap h is formed between the suspended ends of (3), and the composite material cross arm (1), grounding conductor (2) and live conductor (3) are on the same plane, which is parallel to the ground plane, or the high voltage end is inclined upward Make an angle of not more than 30° with the ground plane. 2. The new lightning protection structure for overhead high-voltage transmission lines according to claim 1, characterized in that the axis of the composite material cross arm (1) is parallel to the lightning discharge gap h, and the included angle with the ground plane is 0°~30°. 3. The new lightning protection structure for overhead high-voltage transmission lines according to claim 1, characterized in that the distance L between the shed of the composite material cross arm (1) and the discharge gap h is not less than 500 mm. 4. The new lightning protection structure for overhead high-voltage transmission lines according to claim 1, characterized in that the grounding conductor (2) and the charged conductor (3) are made of metal materials, and the discharge end can be made into a spherical shape or a tip shape or needle-like.