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Retrofitting Method of Lightning Protection Corner for Overhead Transmission Line

An overhead transmission line and overhead transmission line technology, applied in the direction of overhead lines/cable equipment, etc., can solve the problems of high technical difficulty and high cost, and achieve the effect of reducing the probability of lightning shielding and improving the lightning protection level of the power grid.

Active Publication Date: 2016-02-24
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a modification method for the lightning protection angle of overhead transmission lines in view of the defects of the existing modification technology that is difficult and expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Record the distance between the conductors in the section of the overhead transmission line to be transformed, the distance between the ground and the ground, and the distance between adjacent conductors, and record the distance between the grounds at both ends of the overhead transmission line to be transformed. Then, according to the data recorded above, the lightning shielding trip rate of the overhead transmission line section to be transformed is calculated by using the procedure method;

[0019] (2), referring to the operating index of the lightning shielding tripping rate of the overhead transmission line section to be transformed, the lightning shielding tripping rate obtained in step (1) does not meet the operating index requirements of the lightning shielding tripping rate of the overhead transmission line section to be transformed, according to the steps (1) The recorded distance between the conductors and ground wires in the section of the overhead transm...

Embodiment 2

[0023] Step (1) is with embodiment 1;

[0024] (2) Compared with the operating index of the lightning shielding tripping rate of the overhead transmission line section to be transformed, the lightning shielding tripping rate obtained in step (1) meets the operating index requirements of the lightning shielding tripping rate of the overhead transmission line section to be transformed, and there is no need to carry out lightning protection Protective corner makeover.

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Abstract

The invention discloses a method for modifying the lightning protection corner of an overhead power transmission line. The method comprises the following steps: (1) acquiring the lightning shielding trip-out rate of the overhead power transmission line to be modified; (2) acquiring the distance between adjacent leads at the two ends of a power transmission line segment; (3) connecting windings in series with a spacer between the windings; (4) acquiring the lightning shielding trip-out rate; (5) repeating the step (1); (6) connecting windings in series with a spacer between the windings; (7) continually acquiring the lightning shielding trip-out rate. If the obtained trip-out rate meets a running index requirement, modification is successful. The method has the beneficial effects that (1) modification of the lightning protection corner of the overhead power transmission line is realized without changing the structure of a tower head; (2) the probability of lightning shielding is lowered, and the lightning protection level is raised; (3) the method is simple and practicable; (4) the method is suitable to be popularized to lightning protection design of a power grid infrastructure stage and modification of the lightning protection corner.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering and relates to a method for transforming lightning protection of overhead transmission lines. Using this method can reduce the lightning protection angle of the transmission line, reduce the lightning tripping rate, and improve the lightning protection ability of the power grid. Background technique [0002] Lightning strike is one of the important factors that endanger the safe and stable operation of the power grid. For a long time, transmission line tripping incidents caused by lightning strikes have occurred frequently, posing a great threat to the safe and stable operation of the power grid. For example, according to the fault classification statistics of Hunan Power Grid, in areas with a high trip rate, the number of trips due to lightning strikes accounts for 40-70% of the total number of trips. Statistical analysis found that when the lightning protection angle is greater ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G1/02
Inventor 王峰黄福勇王成彭波巢亚锋赵世华周卫华
Owner STATE GRID HUNAN ELECTRIC POWER
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