Thunder damage protection risk automatic assessment method for power transmission line

Abstract

The invention provides a thunder damage protection risk automatic assessment method for a power transmission line. The thunder damage protection risk automatic assessment method comprises the steps of collecting parameters of a typical pole tower and recording values of parameters comprising thunder parameters, pole tower parameters, landform parameters, line parameters and cloud-to-ground lightning parameters; establishing a back striking calculation model and a shielding failure calculation model according to the parameters of the typical pole tower; calculating the shielding failure trip-out rate n1 of the pole tower on the basis of electromagnetic transient calculation program and according to the parameters of the typical pole tower and the shielding failure calculation model; calculating the pole tower shielding failure trip-out rate n1=NgP1eta on the basis of a guiding developing model; calculating the average lightning stroke trip-out rate N according to the back striking trip-out rate n1 and the shielding failure trip-out rate n2; and performing grading on the whole line pole tower based on lightning stroke risks according to the average lightning stroke trip-out rate N. The pole tower with the severe anti-thunder situation can be found before lightning stroke faults occur in the line, modification measures are adopted ahead of time, and the lightning stroke trip-out rate of the power transmission line is reduced.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an automatic assessment method for lightning protection risks of transmission lines. Background technique [0002] In the power system, the transmission lines are mostly located in the wilderness, and the span is very long, so it is easy to be struck by lightning. Although a variety of lightning protection technical measures have been taken, the trip rate due to lightning strikes is still high, which has become the most important threat to the safety and stability of the power system. [0003] The lightning protection work of transmission lines has been in a relatively passive situation for a long time, which is related to the random characteristics of lightning in nature on the one hand, and is also caused by ineffective technical management measures on the other hand. At present, lightning protection work mainly relies on experience guidance, and lightning protection m...

AI Technical Summary

Problems solved by technology

[0005] One is the lack of foresight and guidance, and it is impossible to find the weak link of line lightning protection in advance and take measures;

[0006] The second is that the pertinence is not strong, with a certain degree of blindness, and often the investment is large but the effect is not obvious;

[0007] Third, the calculation of the lightning trip rate is obviously rough, and the calculation results lack accuracy

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