Online monitoring method of overhead line equivalent icing thickness

Abstract

The invention discloses an online monitoring method of overhead line equivalent icing thickness. The method comprises the steps of (1) extracting guide / ground wire historical tension force data, dip angles and meteorological data which are monitored on line, obtaining guide / ground wire historical tension force data and dip angle data in the ice-free period, (2) according to the guide / ground wire historical tension force data and dip angle data in the ice-free period, obtaining guide / ground wire historical tension force vertical load data to obtain average vertical load and the maximum vertical load, (3) according to the average vertical load, the maximum vertical load and tower foundation information, obtaining average equivalent guide / ground wire lengths and the maximum equivalent guide / ground wire lengths, (4) extracting guide / ground wire real-time tension force data and dip angle data which are monitored on line, calculating the guide / ground wire equivalent icing thickness and the guide / ground wire conservative equivalent icing thickness, and (5) according to the real-time meteorological data, selecting reference equivalent icing thickness or the conservative equivalent icing thickness to judge the icing amount of an overhead line. The online monitoring method has the advantages of being simple in calculation, and high in accuracy and reliability.

Description

technical field [0001] The invention relates to the field of on-line monitoring of transmission lines in the field of electric power, in particular to an on-line monitoring method for the equivalent ice thickness of overhead lines. Background technique [0002] Ice and snow accumulation on transmission lines will lead to a sharp decline in its mechanical and electrical performance, causing accidents such as icing flashover of insulators, disconnection of ground conductors, galloping of conductors, collapse of towers, and interruption of power communications. my country is one of the countries in the world where transmission lines are seriously covered with ice. At the beginning of 2008, 13 provinces and cities including Guizhou, Hunan, Jiangxi, Zhejiang, Hubei, Yunnan, and Guangxi suffered severe freezing rain and snow disasters, and the direct economic losses of State Grid and China Southern Power Grid reached 10.45 billion yuan and 15 billion yuan respectively. The ice di...

AI Technical Summary

Problems solved by technology

However, the calculation model of the equivalent icing thickness of the existing transmission lines is too idealized, so that even if advanced hardware devices are installed on site, the power grid company still cannot accurately and effectively grasp the icing status of the line, and then compare it with the design specification for early warning

The insufficient calculation of the ice thickness of the existing transmission lines is mainly manifested in: 1. The theoretical calculation model is too ideal, the amount of basic information required for the tower is large, the steps are cumbersome, and the engineering use is not generalizable; 2. Some models consider wind loads, However, this value cannot be accurately calculated, and the wind speed sensor is often frozen when ice is covered, and the obtained data is invalid; 3. There are errors or errors in the basic information of the tower provided by the power company. Due to the deviation between construction and design, a large number of basic information data of towers are not reliable. The calculation results of the model deviate significantly. The existing correction method is to manually shift the calculation results, which is obviously not scientific and popular, and the reliability of the results is not high.

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