Power transmission line equivalent icing thickness calculation method

Abstract

The invention discloses a power transmission line equivalent icing thickness calculation method, which comprises the steps of: step 1, extracting historical tensile force value measured data of an icing monitoring terminal, removing tensile force value data when a line is iced, and acquiring historical tensile force value data in a non-icing period; step 2, calculating a historical tensile force average value of the line when the line is not iced; step 3, calculating a tensile force value of the line when the line is not iced according to a conductor state equation, comparing the tensile force value with the historical tensile force average value when the line is not iced, and correcting tensile force value measured data; step 4, and establishing a power transmission line equivalent icing thickness calculation model which takes the line designed ice thickness and the vertical span varying along with the icing thickness into account according to the corrected tensile force value data acquired in the step 3. The power transmission line equivalent icing thickness calculation method solves the technical problems of large power transmission line equivalent icing thickness errors calculated by adopting the prior art and the like.

Description

technical field [0001] The invention belongs to the field of icing calculation of power transmission lines, and in particular relates to a calculation method for equivalent icing thickness of transmission lines. Background technique [0002] The icing of transmission lines in winter is a physical phenomenon mainly caused by the joint action of air temperature, relative humidity and convection of cold and warm air. In my country, line icing mainly occurs in the southwest region, and there are also small areas of icing in the northwest and central China. The icing of the line increases the vertical load of the conductor. When the load reaches a certain critical value, it will cause serious electrical disasters such as tower collapse and disconnection, resulting in large economic losses. At the beginning of 2008, 13 provinces in my country suffered from severe freezing rain disastrous weather, which led to the collapse of large-scale transmission towers and caused direct econo...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for calculating the equivalent icing thickness of a transmission line to solve the problem that the calculation of the equivalent icing thickness of a transmission wire in the prior art does not take into account the change of the vertical span of the tower during the icing process of the line Different vertical spans directly lead to different vertical loads on the line; at the same time, the influence of the initial design ice thickness of the line on the calculation of the equivalent ice thickness is ignored; therefore, the calculated equivalent ice thickness of the transmission line has a large error, etc. technical problem

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