35kV power transmission line comprehensive lightning protection method

A technology for transmission lines and comprehensive lightning protection, which is applied in the installation of electrical components, varistors, cables, etc., and can solve problems such as narrow application scope, no consideration of line operating conditions, and large limitations of lightning protection measures.

Active Publication Date: 2020-10-23
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 light

Method used

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  • 35kV power transmission line comprehensive lightning protection method
  • 35kV power transmission line comprehensive lightning protection method
  • 35kV power transmission line comprehensive lightning protection method

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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 35kV power transmission line comprehensive lightning protection method, and relates to the technical field of power transmission line lightning protection. The method comprises the following steps: firstly, based on a lightning ground flashover density reference index value of 0.78 times/(km < 2 >. a), by combining line terrain and historical operation data , dividing thelightning stroke risks of the stepped towers into four levels, namely a light thunder area, a medium thunder area, a multi-thunder area and a strong thunder area, wherein four different levels sequentially correspond to a level prevention scheme, a level prevention scheme, a level prevention scheme and different lightning protection schemes of the level prevention scheme, and after the 35kV powertransmission line is rectified, the lightning trip-out rate is reduced by about 70%, the operation and maintenance amount of the line is greatly reduced, and the power supply reliability is improved.According to the scheme, terrain, historical operation and lightning density are comprehensively considered, the analysis method is simple, practical and scientific, and a scientific reference basisis provided for 35kV power transmission line lightning protection implementation and lightning damage treatment.

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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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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