A Comprehensive Lightning Protection Method for 35kV Transmission Line

A technology for transmission lines and comprehensive lightning protection, applied in the installation of varistors, electrical components, cables, etc., can solve the problems of not considering the operating conditions of the line, the limitations of lightning protection measures, and the narrow scope of application, and achieves the analysis method. Simple, practical and scientific, the effect of improving the reliability of power supply and reducing the amount of operation and maintenance

Active Publication Date: 2021-09-28
DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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Problems solved by technology

[0004] The purpose of the present invention is to provide a comprehensive lightning protection method for 35kV transmission lines, which solves the problems that the existing lightning protection measures are limited and the scope of application is narrow due to the lack of consideration of line operation status, lightning activities, and corridor environment

Method used

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  • A Comprehensive Lightning Protection Method for 35kV Transmission Line
  • A Comprehensive Lightning Protection Method for 35kV Transmission Line
  • A Comprehensive Lightning Protection Method for 35kV Transmission Line

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Embodiment

[0024] figure 1 A comprehensive lightning protection method for a 35kV transmission line is shown, including the following steps:

[0025] (1) Obtain the lightning density, topography, and historical operation records of each tower in the 35kV transmission line in the past five years, and divide the towers into light mine areas, medium mine areas, multiple mine areas, and strong mine areas according to the risk of lightning damage . specifically:

[0026] When the lightning density of the tower is less than or equal to 0.78 times / (km 2 .a) or the tower is located in a valley, then the tower is directly in the light minefield;

[0027] When the lightning density of the tower > 0.78 times / (km 2 .a), and the line connected to the tower is not in the suburbs or rural areas, it is determined that the tower is in the middle minefield;

[0028] When the lightning density of the tower > 0.78 times / (km 2 .a), and the line connected to the tower is in the suburbs or rural areas, b...

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Abstract

The invention discloses a comprehensive lightning protection method for a 35kV transmission line and relates to the technical field of lightning protection for transmission lines. Firstly, based on the lightning flash density reference index value of 0.78 times / (km 2 .a), combined with the line terrain and historical operation data, divide the lightning strike risk of each base tower into four levels: light minefield, medium minefield, multiple minefield and strong minefield. The four different levels correspond to the level of prevention plan, Level-level prevention schemes, level-level prevention schemes, and different lightning protection schemes for level-level prevention schemes. After the rectification of the 35kV transmission line, the lightning trip rate was reduced by about 70%, which greatly reduced the amount of operation and maintenance of the line and improved the reliability of power supply. The above-mentioned scheme comprehensively considers the terrain, historical operation, and lightning density, and the analysis method is simple, practical and scientific, and provides a scientific reference for the implementation of lightning protection and lightning damage control of 35kV transmission lines.

Description

technical field [0001] The invention relates to the technical field of lightning protection for transmission lines, in particular to a comprehensive lightning protection method for 35kV transmission lines. Background technique [0002] The number of insulators for 35kV transmission lines is 3-4 pieces, and the insulation level is low. Generally, lightning protection lines are not erected, and the tower is naturally grounded. Insulator flashover. The development of lightning protection schemes for 35kV transmission lines will help the operation and maintenance units to discover lines and sections with high lightning tripping rates in time, and implement targeted lightning protection renovation projects for weak points. At present, domestic and foreign studies on the formulation of lightning protection schemes for 35kV transmission lines are mainly focused on the configuration of individual lightning protection measures. There is no systematic comprehensive consideration of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G13/00H01C7/12
CPCH01C7/12H02G13/40H02G13/80
Inventor 张文锋朱道俊杨丽李国彬李志伟张国建苏洪羽史良池赵向东熊恒昌王宗明程海萍
Owner DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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