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Power transmission line bow-shaped wire sag measuring method

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 expenditure, improving safety benefits, and reducing errors.

Active Publication Date: 2016-01-06
STATE GRID SHANDONG ELECTRIC POWER +1
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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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  • Power transmission line bow-shaped wire sag measuring method

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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 power transmission line bow-shaped wire sag measuring method, belonging to the measurement method technology field. The power transmission line bow-shaped wire sag measuring method comprises steps of measuring characteristics of angles and distances through a total station, determining part of the side length and the angle of two triangles, and performing calculation according to the triangle cosine law so as to obtain the maximum sag of the bow-shaped wire. The invention, on the one hand, reduces the measurement errors and improves the pertinency of the wind drift risk alteration. On the other hand, the invention does not need the worker to clime the pole and perform wire outgoing measurement, reduces the consumption of the labor and material resources, saves the cost, greatly reduces the safety risks, guarantees the safety of the working staff and greatly improves the safety benefit. The power transmission line bow-shaped wire sag measuring method is widely applicable to the power transmission line bow-shaped wire sag measurement.

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 Applications(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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