GIS (geographic information system) based three-dimensional jumper sag determination method

A determination method, a technique for sag, applied in the direction of adjusting/maintaining mechanical tension, etc.

Inactive Publication Date: 2014-12-10
STATE GRID CORP OF CHINA +1
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Problems solved by technology

In the process of transmission line design, it is

Method used

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  • GIS (geographic information system) based three-dimensional jumper sag determination method
  • GIS (geographic information system) based three-dimensional jumper sag determination method
  • GIS (geographic information system) based three-dimensional jumper sag determination method

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Embodiment Construction

[0046] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] The meanings of symbols in the present invention are as follows:

[0048] 1)ψ 1 , ψ 2 is the number of horizontal rotation angles (°) of the tension string on the front and rear sides. Only when the maximum sag of the jumper is calculated, the inner side line ψ of the corner is negative, and the rest are negative. When the cross arm is located on the bisector of the angle between the line directions, ψ 1 =ψ 2 .

[0049] 2)λ 1av , λ 2av are the average lengths (m) of the front and rear tensile strings, respectively. In the case of split conductors, calculate to the average center of the ends of each tension clamp.

[0050] 3)G 1v , G 2v are the vertical loads (N) of the front and rear tensile strings, respectively.

[0051] 4)G 1h , G 2h are the horizontal wind loads (N) of the front and rear tensile strings respec...

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Abstract

The invention relates to a GIS (geographic information system)-based three-dimensional jumper sag determination method. The method includes (1) calculating the minimum tolerance sag f<pm> of the jumper; (2) examining the minimum tolerance sag f<pm>; (3) calculating the minimum tolerance sag f<pm> in an interactive manner; (4) calculating the maximum tolerance sag f<pm> of the jumper; (5) selecting a jumper construction sag f<p0>; (6) calculating a swing sag of a quad-bundle jumper; (7) calculating the sag length of the jumper. By the use of the method, operation efficiency and safety on a tower are improved so as to shorten the construction period, save labor and enhance mounting quality; construction cost is lowered during the construction, safety and efficiency are improved, use requirement of line project is met, and design quality is increased; wire number is available before construction, thus wire waste is avoided during the construction, construction cost is reduced, construction materials are saved, and construction benefits of the project department are increased.

Description

technical field [0001] The invention relates to a method for determining the sag of an overhead transmission line, and a method for determining the sag of a three-dimensional jumper based on GIS. Background technique [0002] The jumper is the tension tower drainage line connecting the conductors on both sides of the tension tower. The installation of jumper drainage is an important part of the installation of overhead transmission line accessories, which directly affects the process of the entire transmission project. [0003] In the construction of existing transmission lines, in order to save manpower, improve work efficiency and ensure safety in tower operation, the so-called "prefabricated" construction method is often used, that is, the length of the wire between the support points of the tower wire and the tension tower are estimated in advance. The length of the jumper; when laying out the wire on the ground, mark the position where the wire clip is fixed, and insta...

Claims

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Application Information

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IPC IPC(8): H02G7/02
Inventor 刘蕊莫娟曹枚根张霞张雪松沈鸿冰刘玉杰
Owner STATE GRID CORP OF CHINA
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