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Distribution line lightning protection level evaluation method

A technology for power distribution line and level evaluation, which is applied in the field of level evaluation, can solve the problems of complex structure of distribution lines, no specification of the indicator value of lightning trip rate for distribution lines, and heavy workload of evaluation of lightning protection level, etc., so as to improve the accuracy. and scientific, the input parameters are flexible and changeable, and the effect of simplifying the calculation process

Pending Publication Date: 2019-05-14
GUANGDONG POWER GRID CO LTD +1
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AI Technical Summary

Problems solved by technology

[0003] The structure of distribution lines is complex, the workload of lightning protection level evaluation is large, and the lightning data has obvious time characteristics and spatial characteristics, and the timeliness of lightning protection level evaluation results is not long
Moreover, there is no specific specification for distribution lines to specify the index value of lightning tripping rate, and the index values ​​of different lines in different regions are also slightly different, which causes uncertainty in the evaluation results of lightning protection level

Method used

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  • Distribution line lightning protection level evaluation method
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  • Distribution line lightning protection level evaluation method

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Embodiment 1

[0038] Such as figure 1 As shown, a method for evaluating the lightning protection level of distribution lines disclosed in the present invention includes:

[0039] S1: Collect electrical and structural parameters of distribution lines, and establish a line parameter database;

[0040] In the example of this application, the distribution line parameters include: tower height, insulator type, tower grounding resistance, topography and topography.

[0041] In this embodiment, all possible parameters of the distribution lines are firstly collected, and then combined to obtain actual line parameters under various working conditions, and the statistical results include line parameters of all towers of all distribution lines.

[0042] S2: Statistically analyze the actual lightning data in the distribution line area, and establish a statistical model for lightning density and a fitting model for the probability distribution function of lightning current amplitude;

[0043] In the e...

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Abstract

The invention discloses a distribution line lightning protection grade evaluation method, which comprises the following steps: S1, collecting distribution line electrical and structural parameters, and establishing a line parameter database; S2, carrying out statistical analysis on the actual lightning data of the distribution line region, and establishing a ground lightning density statistical model and a lightning current amplitude probability distribution function fitting model; S3, establishing a distribution line lightning overvoltage accurate simulation analysis model based on an electromagnetic transient numerical simulation program PSCAD / EMTDC; S4, simulating and calculating the lightning resistance level and the lightning trip-out rate of the distribution line under different linestructures, lightning data and landforms; and S5, arranging the simulation data, establishing a distribution line lightning protection grade evaluation mathematical model, and evaluating the distribution line lightning protection grade. On the basis of index values such as power distribution line parameters and lightning positioning system data, the lightning protection level of each base tower can be directly obtained according to the calculation model, and the effectiveness and scientificity of power distribution line lightning protection level evaluation are improved.

Description

technical field [0001] The invention belongs to the field of electrical technology, and more specifically relates to a lightning protection level evaluation method for distribution lines. Background technique [0002] The power distribution line is an important part of the power system. It is the last level of power distribution. It directly supplies power to special transformer users, and then distributes power to ordinary power users through distribution transformers. Its operation is safe and stable. It is directly related to the reliability of power consumption of power users. Lightning strike is one of the main factors affecting the safe operation of distribution lines. Relevant statistics show that lightning strike accidents in my country's distribution line accidents are as high as 40%-70%. Therefore, it is of great significance to accurately evaluate the lightning protection level of distribution lines for effective lightning protection of distribution lines. [00...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 程子专林清华梁健昂李孟伟陈雅芳郭亚平邱续东韩永霞刘浩陈长富颜永光王世龙信莲莲
Owner GUANGDONG POWER GRID CO LTD
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