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Sag Measurement Method of Bow and Subline of Transmission Line

A measurement method and transmission line technology, applied in measurement devices, instruments, etc., can solve problems such as unfavorable development and potential safety hazards, and achieve the effects of reducing human and material expenditures, improving safety benefits, and saving costs

Active Publication Date: 2018-02-13
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the maximum sag is greater than the operating standard, it is easy to cause safety hazards, and it needs to be included in the maintenance plan for modification
However, there is currently no effective method to measure the sag of the bow line. One way is to estimate it visually, but there is a large error
Another way is to complete the measurement work by three people climbing on the pole and going out of the line (down wire), which has potential safety hazards and is not conducive to the development of the work.

Method used

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  • Sag Measurement Method of Bow and Subline of Transmission Line

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Embodiment

[0030] As a preferred case, in the actual measurement process, a total station is used to measure l at the observation point O 1 The length is 5m, l 2 The length is 15m, and the included angle α is 60 degrees. According to the measured included angle α and l 1 , l 2 , using the law of cosines to calculate l 4 , in triangle OAB, cosα=(l 1 2 +l 2 2 -l 4 2 ) / 2l 1 l 2 , then l 4 =[l 1 2 +l 2 2 -(2l 1 l 2 ×cosα)] 0.5 , put the measured value into the formula to calculate l 4 =13.2m. Using the measured l 1 , l 2 and angle α and l 4 , using the law of cosines to calculate l 5 , the calculation formula is: in the triangle OAB, cosβ=(l 2 2 +l 4 2 -l 1 2 ) / 2l 2 l 4 , in triangle OBC, cosβ=(l 2 2 +0.25l 4 2 -l 5 2 ) / l 2 l 4 , namely (l 2 2 +l 4 2 -l 1 2 ) / 2l 2 l 4 =(l 2 2 +0.25l 4 2 -l 5 2 ) / l 2 l 4 , so that l can be obtained 5 =7.8m. Since the midpoint C of AB is an imaginary point, not an actual object, it cannot be measured by ...

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Abstract

The invention discloses a method for measuring the sag of a transmission line bow and sub-line, which belongs to the technical field of measurement methods. According to the characteristics of a total station that can measure angles and distances, the side lengths and angles of two triangles are determined, and then calculated according to the triangle cosine theorem. Thus the maximum sag of the bow line can be obtained. Through this method of measurement, on the one hand, it reduces the error of measurement and improves the pertinence of the renovation of hidden dangers of wind deviation; on the other hand, it does not require staff to climb poles and measure wires (down wires), which reduces manpower and material resources and saves costs. , greatly reducing safety risks, ensuring the personal safety of staff, and greatly improving safety benefits. It can be widely used in the sag measurement of bow sub-lines of transmission lines.

Description

technical field [0001] The invention relates to a measuring method, in particular to a method for measuring the sag of a bow-wire of a power transmission line. The maximum sag of the bow-wire is measured, which facilitates the timely reconstruction of the larger sag of the bow-wire and prevents windage accidents. Background technique [0002] In recent years, ensuring the safe operation of the power grid and reducing the fault trip rate has become an extremely important task in the power industry. In fault tripping, due to the strong wind, the bow wire swings with the strong wind. When the bow wire swings towards the tower, it is easy to cause insufficient insulation distance. The bow wire discharges to the tower and causes a trip accident, which seriously affects the safe power supply. Therefore, preventing wind deflection accidents has become an important work item for transmission lines in recent years. [0003] Before carrying out the wind deflection reconstruction proj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/02
Inventor 曹付勇王丙强陈文栋张晓徐文震王金惠岳宝城胡燕宁张宝光高玉宝阎军
Owner STATE GRID SHANDONG ELECTRIC POWER
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