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Numerical weather prediction-based early warning method for windage yaw flashover of power transmission line

A technology for numerical weather forecasting and transmission lines, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as the inability to realize wind deflection flashover risk warning

Active Publication Date: 2016-11-09
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +1
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Problems solved by technology

The above studies are all based on wind deflection online monitoring devices or finite element simulation software to complete the calculation of wind deflection angle and its model parameters, and cannot realize the early warning of wind deflection flashover risk of transmission lines

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  • Numerical weather prediction-based early warning method for windage yaw flashover of power transmission line
  • Numerical weather prediction-based early warning method for windage yaw flashover of power transmission line
  • Numerical weather prediction-based early warning method for windage yaw flashover of power transmission line

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0028] A wind deflection flashover warning method for transmission lines based on numerical weather forecasting. Firstly, an inverse distance weighted interpolation algorithm is used for grid point forecast wind speed mapping processing, and the wind speed component perpendicular to the line is calculated according to the angle between the wind direction and the line direction ; Then, taking a typical wineglass tower as an example, the minimum air gap between the line and the tower is calculated by using the rigid body straight rod method; finally, the air density, humidity and rainfall are corrected for the gap breakdown voltage, and the flashover under forecast weather conditions is obtained The voltage value is compared with the system operating voltage to complete the classification and early warning of wind deviation flashover. The specific ...

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Abstract

The invention designs a numerical weather prediction-based early warning method for windage yaw flashover of a power transmission line. The method comprises the steps of firstly, performing grid point forecast wind velocity mapping processing by adopting an inverse distance weighted interpolation algorithm, and finishing a wind velocity component perpendicular to the line according to an included angle between a wind direction and a line route; secondly, calculating a minimum air gap between the line and a pole tower by applying a rigid straight bar method by taking a typical cup tower as an example; and finally, performing air density, humidity and precipitation correction on a gap breakdown voltage to obtain a flashover voltage value under a forecast weather condition, and comparing the flashover voltage with a system running voltage to finish graded early warning of the windage yaw flashover. The method has an important practical significance for wind prevention and disaster reduction work of a power grid.

Description

technical field [0001] The invention relates to the technical field of power grid disaster prevention and mitigation, in particular to a wind deflection flashover early warning method for transmission lines based on numerical weather forecasting. technical background [0002] For transmission lines without wind deflection measures, the insulator string or jumper is inclined towards the tower under the action of wind load, which reduces the air gap between the conductor and the tower. When the insulation strength of the gap is not enough to withstand the operating voltage of the system Wind flashovers will occur. Wind flashover is the main factor causing transmission line tripping. According to statistics, from 2007 to 2010, 157, 93, 79, and 174 trips occurred on high-voltage and ultra-high-voltage transmission lines in the jurisdiction of the State Grid due to wind deviation, involving Beijing, Henan, Anhui, Zhejiang and other provincial and municipal companies. Since the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 吴大伟谷山强王海涛赵淳卢恩泽郭钧天田浩陶汉涛章涵张磊陈玥何君
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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