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Method for researching influence of micro-landform strong wind area on safety operation of electric transmission line

A technology for transmission lines and safe operation, applied in data processing applications, instruments, calculations, etc., can solve problems such as line tripping, lack of reliability, etc., to achieve the effect of easy to master, simplification of geographic information and meteorological expertise

Active Publication Date: 2015-02-18
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no reliable method for how to detect micro terrain areas where high winds may cause line trips

Method used

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  • Method for researching influence of micro-landform strong wind area on safety operation of electric transmission line
  • Method for researching influence of micro-landform strong wind area on safety operation of electric transmission line
  • Method for researching influence of micro-landform strong wind area on safety operation of electric transmission line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] Embodiment: The basic source of the meteorological data collected in the design and operation of the transmission line is the local meteorological station. The geographical environment of the transmission line is poor, and it is far away from densely populated areas such as cities and towns. Meteorological stations are generally set up in the suburbs of cities, and there are basically no meteorological stations in the areas where the line passes, especially in micro-topographic and micro-meteorological areas. At present, most of the meteorological data related to transmission lines are calculated by designers and operators based on existing data. Larger, greater impact on transmission line safety and project cost.

[0022] This project collected 20 failure data from July 2005 to July 2012 (see Table 1 below).

[0023] Table 1 Fault data

[0024]

[0025]

[0026] From the perspective of distribution characteristics, most of the faults occurred between the Jiangh...

example 500

[0075] Example 500kV line wind deflection protection scheme

[0076] 3 Project Overview

[0077] 3.1 Tower type

[0078] After consulting the design drawings of the as-built drawings, a total of 7 types of straight towers are used on the whole line, namely ZM1, ZM2, ZM3, ZM4, ZMK1, ZMK2, ZMJ2 and other single-circuit cat head towers.

[0079] 3.2 Wire parameters

[0080] After reviewing the design drawings of the as-built drawing of this project, the wires are 4×LGJ-630 / 45 steel-cored aluminum stranded wires, and the technical parameters of the wires are shown in Table 3.1.

[0081] Table 3.1 Technical parameter list of conductors

[0082] project

unit

data

model

LGJ-630 / 45

Calculation section

mm 2

666.55

outer diameter

mm

33.6

calculate weight

kg / km

2060

Test to ensure breaking force

N

148700

Linear expansion coefficient

1 / ℃

20.9×10 -6

Elastic coefficie...

example 1

[0140] Simulate the distribution of strong winds in Anhui Province. Bringing the 1:50,000 geographical information data of Anhui Province into the regression equation, the GIS spatial distribution of the wind factor is obtained. Judging from the simulated extreme winds, the extreme winds in Anhui Province gradually increase from north to south, and the extreme winds in the south of Huainan are basically above 25m / s; The extreme wind speed is basically above 29m / s, and some parts exceed 33m / s; in addition, the hills and slopes near the Jianghuai hills, Chaohu Lake and the Yangtze River and other water bodies are also relatively large, reaching 29m / s in most areas. / s or above; Most of the Huaibei Plain has slightly lower extreme winds, but there are also sporadic high-value areas of extreme winds in the hilly areas in the north of Huaibei City, with local maximum winds ranging from 27 to 31 m / s.

[0141] The simulated average extreme wind and simulated gale frequency also have...

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Abstract

The invention discloses a method for researching the influence of a micro-landform strong wind area on the safety operation of an electric transmission line. The method for researching the influence of the micro-landform strong wind area on the safety operation of the electric transmission line comprises the steps that (1) a stepwise regression equation a1 is established based on a strong wind factor set a1 and a landform factor set a1; (2) the landform factor set a1 is substituted into the stepwise regression equation a1, so that a simulation strong wind factor set a1 is obtained; (3) based on the linear relationship between the simulation strong wind factor set a1 and a strong wind factor set a2, a unary linear regression equation a2 is established; (4) a landform factor set b1 is substituted into the unary linear regression a2 so that a simulation strong wind factor set b1 is obtained; (5) according to the difference value set between the simulation strong wind factor set b1 and a strong wind factor set b2, a strong wind factor set b3 is obtained; (6) based on the strong wind factor set b3 and a landform factor set b2, a stepwise regression equation b2 is established; (7) a modeling result is obtained, wherein the stepwise regression equation b2 and the unary linear regression equation a2 are back substituted into the stepwise regression equation a1, and then the final modeling result is obtained.

Description

Technical field: [0001] The invention relates to a research method for the influence of micro-terrain and strong wind areas on the safe operation of power transmission lines. Background technique: [0002] Transmission lines are exposed in the atmosphere all the year round, and are often affected by various meteorological conditions such as wind, ice, temperature, and lightning strikes. For example, in spring, summer and autumn, the line is affected by the combination of temperature and wind, and in winter by the combination of temperature, wind and ice. According to statistics, more than 60% of the faults of the line during operation are caused by changes in natural conditions. Therefore, the influence of wind, icing and atmospheric temperature changes is greater, especially the influence of micro-topography and micro-meteorology (marking wind) on the line, which is still a weak link in the line design, operation and maintenance work. [0003] The cases of wind deflection...

Claims

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Application Information

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IPC IPC(8): G06Q50/06
CPCG06Q50/06
Inventor 郝韩兵谢学飞
Owner STATE GRID CORP OF CHINA
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