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AN ASSESSMENT OF WIND DIRECTION AND WIND INDUCED ELECTRIC TRANSMISSION LINE LOADS_ A PROBABILISTIC APPROACH

ABSTRACT

 This work takes a look on the importance and role of probability concept in the design of transmission lines. The reliability of transmission line is clearly a function of the maximum loads that may be imposed over the useful life of the lines. These loads are, more often than not, caused by the extreme wind atmospheric events to which the line is exposed. In the current design calculation of wind load for overhead transmission and distribution lines the annual or weekly extreme wind is always assumed to act at a right angle to the line. This is a conservative assumption, which may result in unnecessarily expensive designs with the reliability values much higher than required. A new method for analyzing line loadings, taking into account wind directions was used in carrying out this work. The approach was based on separating extreme wind data into eight convenient line orientations and non-directional. The probability distribution functions of the wind speeds were obtained for each of the line orientations and that of the non-directional. Weather data obtained from the meteorological department of Nigeria Civil Aviation Enugu were used to determine the loading of the wind speeds on the conductor. Reliability indices were computed for the eight line orientations and that of the non-directional. Results show that the mean values of the non-directional wind and loadings are always greater than the corresponding values in directional cases. Thus, the saving in the line construction costs could be significant if the effect of wind directions were taken into account in the calculation of the design wind load.

Project detailsContents
 
Number of Pages201 pages
Chapter one Introduction
Chapter two Literature review
Chapter three  methodology
Chapter  four  Data analysis
Chapter  five Summary,discussion & recommendations
ReferenceReference
QuestionnaireQuestionnaire
AppendixAppendix
Chapter summary1 to 5 chapters
Available documentPDF and MS-word format


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