Research On The Systemreliability Of The Transmission Line

As a complex of lifeline engineering, the transmission line is an important andessential part of the power system. It is also the realization of the power energy of longdistance transportation. The investment of Transmission line is enormousand far-reaching.Safety, economy and reliabilityis not only the basic requirement of thepower system, but alsothe fundamentalrequirements for transmission line. Reasonableand reliabledesignis to ensure the effective protection of the safe operation of thecircuit.Therefore, research on integral reliability of the transmission line project hasimportant engineering significance.In this paper, We use the method of moments whichis based on the Rosenblatt transform and the moment method based on Nataftransform, Series system reliability analysis method to analyze the reliability oftransmission lines with meticulous analysis and simplified analysis. Specifically, theresearch mainly including the following aspects.Firstly, according to the relevant information, by selecting the typical tower wereanalyzed and using the finite element software ANSYS, We establish the finite elementmodel of the typical tower and tower line system.Secondly, for the typical tower line system, by introducing the equivalent extremevalue event principle, and using the moment method for reliability analysis, we cananalys the overall reliability index of the tower line system.Then, in the fine analysis of multi tower line system, considering the correlation ofwind speed, we generate relevant speed model by using the Nataf transform andthe wind load dependent. By using the moment method equivalent extreme valueevent based on the principle of the statistical moments of the corresponding and thefinal overall reliability index. We can get the final overall reliability index by using themoment method based on the principle of equivalent extreme value event.Finally, according to the correlation coefficient function with exponential decay,the tension section were analyzed by using the method for calculating the reliability ofseries.Then the reliability index β with an unknown parameter a is equal to thereliability index of fine analysis, so that, the unknown parameter is got.Through theanalysis of the relationship between reliability index of tower line systemand thecharacteristic parameters of the reliability index, then an explicit model for reliability calculation of line tower line system and tension tower line system are obtained.