An early warning method for weak links of ice-coated transmission lines

A technology for transmission lines and weak links, which is applied in the field of early warning of weak links in ice-covered transmission lines, and can solve problems such as long time consumption, lack of accuracy, and low accuracy

Inactive Publication Date: 2016-08-31
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common disadvantage of the above two methods is that the indirect acquisition of stress values ​​lacks accuracy; the first method requires relevant staff to go to the site to measure the sag, which not only consumes human resources, but also takes a long time; the second method relies on experts Experience, not automatic enough, and relatively low accuracy

Method used

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  • An early warning method for weak links of ice-coated transmission lines
  • An early warning method for weak links of ice-coated transmission lines
  • An early warning method for weak links of ice-coated transmission lines

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Embodiment 1

[0127] An icing scene consists of 6 consecutive gears in a tension section. Real-time temperature t=-5°C, maximum temperature 40°C, minimum temperature -20°C, average temperature 15°C, temperature t during wiring 0 = 10°C. Icing thickness value of each gear b i =[10mm 15mm 15mm 25mm 20mm 20mm]. The wire model of the transmission line is LGJ-300 / 40, and the corresponding elastic coefficient E of the wire is 73000N / mm 2 、Cross-sectional area A=338.99mm 2 , Outer diameter D = 23.94mm, mass per unit length q = 1.133kg / m, temperature expansion coefficient α = 19.6 / ℃, corresponding ultimate tensile force is 92220N, each gear span l i0 =[350m 400m 450m 500m 500m 350m], height difference h of each file i0 =[20m 20m 10m -10m -20m -20m], the length λ of the hanging string on each base line tower i (m)=5.2m, vertical load G i =2300N, the initial horizontal stress σ under the air temperature of the wire 00 =51N / mm 2 .

[0128] Step 1. Determine the meteorological data, ice thick...

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Abstract

The invention discloses an early warning method for weak links of ice-covered transmission lines, which comprises the following steps: 1. Determining weather forecast information, ice-covered information, and transmission line information; The real-time stress value of each gear in the tower section, and calculate the unbalanced force on the tower, 3. Analyze the numerical relationship between the real-time stress value and the ultimate stress value, conduct early warning for wires in different levels, and compare the unbalanced force and limit unbalance of the tower Power, and the tower early warning is carried out in different levels. The invention can realize the intelligent judgment on the wire breakage of the transmission line when the power system is in ice-covered period. Through the comprehensive collection of information, the representative span calculation model and the precise stress calculation model are used to measure the stress values ​​of each gear of the line, so as to accurately judge whether the line is in danger of disconnection, and avoid the indirect, low precision, and energy-consuming traditional judgment methods. Shortcomings of time.

Description

technical field [0001] The invention belongs to the safety defense of icing disasters in power systems, in particular to an early warning method for weak links of icing transmission lines. Background technique [0002] Due to my country's vast territory, complex geographical environment and diverse climate types, extreme natural disasters occur frequently, such as typhoon disasters that often occur in the southeastern coastal areas every year, ice disasters in the Yunnan-Guizhou Plateau and the Three Gorges area, etc. Under these extreme weather conditions, the load on the transmission line will exceed its design capacity, causing significant changes in the stress of the transmission line, which will lead to grid failure. For example, in the ice and snow disaster in 2008, due to the long-term freezing rain, serious icing occurred on the transmission line, which caused changes in the stress of the conductors, resulting in excessive stress on the conductors and the accident of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B19/02
Inventor 谢云云张连花金颖张明宇张令灏
Owner NANJING UNIV OF SCI & TECH
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