Abstract
The recurrence of failures of 500 kV overhead lines in a vast region on an extended time interval is investigated. An essential scatter of their flaw rate (failure frequency) values under the effect of natural and social-economic factors has been revealed. The failure frequency wavelet spectra were plotted, from which a few historical failure rate periods have been revealed. It is proposed to consider the flaw rate as the output signal of a dynamic system containing a multitude of poorly formalized inputs. This parameter is determined by multifactorial and poorly formalized summation of the effects caused by the environment and by social-economic relations. The stability of this dynamic system has been estimated. Ways for formalizing the multidimensional dynamic model of failure rate in the grid backbone networks have been outlined.
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