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Method for giving wire damage alarm when lead wire is coated by ice

A wire and line technology, applied in the field of power grid transmission lines, can solve problems such as wire, tower damage, etc.

Active Publication Date: 2010-03-10
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The task of the present invention is to provide an improved early warning method for line damage when the wire is covered with ice, which solves the problem that the existing power transmission line ice coverage monitoring method does not quantitatively calculate the possible damage to the wire and tower from the perspective of line damage

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  • Method for giving wire damage alarm when lead wire is coated by ice
  • Method for giving wire damage alarm when lead wire is coated by ice

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Embodiment Construction

[0016] Referring to the accompanying drawings, according to a method for early warning of line damage when the wire is covered with ice, the load on the wire when the line is covered with ice mainly includes the self-gravity load of the wire, the ice gravity load and the wind load.

[0017] Gravity load g 1 =9.80665×p 1

[0018] specific load gamma 1 =g 1 / A【N / (m.mm2)】

[0019] Ice gravity load g 2 =9.80665×0.9πδ(δ+d)×10 -3

[0020] g 3 =g 1 +g 2

[0021] Self-gravity load + ice gravity load

[0022] Specific loading when icing¶ 3 =g 3 / A【N / (m.mm2)】

[0023] Wind load g when icing 5 =0.625v 2 (d+2δ)αμ sc ×10 -3

[0024] Comprehensive load when icing

[0025] Specific loading when icing¶ 7 =g 7 / A【N / (m.mm2)】

[0026] Among them: A wire cross-sectional area mm2

[0027] p1 wire unit mass kg / m

[0028] d wire diameter mm

[0029] δIcing thickness of electric wire mm

[0030] v Wind speed at the average height of the wire m / s

[0031] αWind pressure n...

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Abstract

The invention relates to a method for giving a wire damage alarm when lead wire is coated by ice, which performs calculation and judgment on disconnection, vertical overload of a tower and longitudinal unbalanced tension of the lead wire. The method is implemented by the following work procedures: a, calculating design load and actual load according to tower design, actual vertical span, the design load and ice thickness measurement data; b, at the same time, calculating wire tension and unbalanced tension according to the ice thickness measurement data and wind measurement data; and c, sending early-warning information when any of the design load and the actual load calculation, the wire tension calculation and the unbalanced tension calculation is overloaded. When an icing on-line monitoring device monitors the icing condition of a power supply wire, the method performs calculation and analysis according to the monitored data to judge whether the wire icing condition threatens the safety operation, and send warning signals in time.

Description

technical field [0001] The invention relates to power grid transmission lines, in particular to a method for performing real-time calculation and analysis on transmission line icing data measured by a power transmission line icing monitoring device, and giving a line damage warning method when a certain limit value is reached. Background technique [0002] Ice disasters on transmission lines are manifested as a large number of collapsed towers, damaged towers and disconnected faults. According to the investigation and analysis of ice disasters on the transmission line, several factors can cause the ice-covered tower collapse and damage of the transmission line. The collapse of towers caused by icing depends on the terrain environment of each tower and its design margin. [0003] There are many methods for monitoring icing on transmission lines, such as methods based on monitoring and calculation of fiber optic composite insulators, weighing methods, insulator stress monitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/00G08B31/00
Inventor 郑旭
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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