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Lightening arrester of transmission line

A lightning protection device and transmission line technology, applied in the installation of cables, electrical components, installation of lighting conductors, etc., can solve problems such as large investment and environmental damage, and achieve the effects of reduced lightning trip rate, low cost, and easy promotion.

Inactive Publication Date: 2010-09-01
龚良贵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the former is very damaging to the environment, while the latter requires a lot of investment

Method used

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  • Lightening arrester of transmission line
  • Lightening arrester of transmission line
  • Lightening arrester of transmission line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] On the transmission line lightning protection device used in 110kV double lightning protection line transmission line:

[0043] DL / T620-1997 stipulates that lightning protection lines are generally erected along the entire line of 110kV lines, and double lightning protection lines should be erected in mountainous areas and areas with particularly strong lightning activities. In southern China, more than 90% of 110kV transmission lines are equipped with double lightning protection lines. The following is the calculation and analysis of the lightning trip rate after the lightning protection gap is installed on the 110kV double lightning protection line transmission line:

[0044] (1) Calculation of counterattack tripping rate of 110kV double lightning protection line transmission line without lightning protection device

[0045] 110kV double lightning conductor line such as figure 1 :

[0046] 1) The average height h of the lightning conductor g =22.85-2 / 3×2.8=21(m) ...

Embodiment 2

[0102] Embodiment 2: The lightning protection device of the transmission line is installed on the 220kV double lightning protection line transmission line:

[0103] DL / T620-1997 stipulates that 220kV transmission lines should be erected with double lightning protection lines, laying the foundation for the application of transmission line lightning protection devices.

[0104] (1) Calculation of counterattack tripping rate of 220kV double lightning protection line transmission line without lightning protection device

[0105] The calculation examples in Appendix C of DL / T620-1997 "Overvoltage Protection and Insulation Coordination of AC Electrical Installations": are quoted below.

[0106] 220kV double lightning protection lines such as figure 2 :

[0107] 1) The average height h of the lightning conductor g =29.1-2 / 3×7=24.5(m)

[0108] 2) The average height of the wire h c =23.4-2 / 3×12=15.4(m)

[0109] 3) The geometric coupling coefficient of the double lightning condu...

Embodiment 3

[0152] When the impact grounding resistance of towers is greater than the specified value, install lightning protection devices for transmission lines to reduce the tripping rate due to lightning strikes

[0153] For transmission lines with a voltage level of 500kV and above, when the tower impacts the grounding resistance R i When i The increase of counterattack tripping rate increased significantly.

[0154] Now, according to the 110-500kV line tower size and the 50% lightning impulse withstand voltage level of the insulators in Examples 1-3, the respective lightning withstand levels calculated for different tower grounding resistance impact values ​​are listed in the following table.

[0155]

[0156] It can be seen from the above table that for various voltage levels, the lightning resistance level of line counterattack decreases with the increase of tower grounding resistance. According to the inherent characteristics of the cumulative probability distribution of ligh...

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Abstract

The invention discloses a lightening arrester of a transmission line, comprising a lightening wire main body, a lightening wire jumper, an insulating stay wire and gap impedance, wherein the insulating stay wire is fixed below a tower top through a suspension clamp at the tower top; the tower top is longitudinally connected with an insulating strut; the insulating strut fixes one end of the lightening wire jumper through a metal fixed plate transversely connected with the top end of the insulating strut; the other end of the lightening wire jumper and the lightening wire main body are connected and fixed with the insulating stay wire through strain clamps at the two ends of the insulating stay wire; an air gap is formed between the lightening wire jumper and the tower top; and the air gap is internally provided with the gap impedance. In the lightening arrester of the transmission line of the invention, the gap impedance is utilized to lower the counterattack trip-out rate of the transmission line, thus lowering the lightening stroke trip-out rate of the transmission line with the voltage grade of 110kV or more. The lightening arrester of the transmission line of the invention is simple and practicable, low in cost, convenient to promote and can be applied in all the transmission lines adopting double lightening wires.

Description

technical field [0001] The invention relates to a lightning protection device for transmission lines. Background technique [0002] Transmission lines extend vertically and horizontally, are located in the wilderness, and are vulnerable to lightning strikes. Tripping accidents caused by lightning strikes account for one-third or more of all tripping accidents on transmission lines. Therefore, seeking more effective lightning protection measures for transmission lines has always been a topic of concern to electric power workers all over the world. [0003] The lightning protection work of transmission lines has gone through two periods: inductive lightning protection and direct lightning protection. Before the 1930s, inductive lightning protection was the main aspect of the lightning protection work of power grid enterprises. However, the actual measurement proves that the induced lightning overvoltage generally does not exceed 500kV, and it will cause a certain flashover a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G13/00
Inventor 龚良贵
Owner 龚良贵
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