ESTIMATION OF INDICATORS OF RELIABILITY OF POWER TRANSMISSION LINES IN THE LOWER VOLGA REGION

The research is performed of statistical data on power line failures (110 kV overhead lines) in the Lower Volga region for the period of operation from 2010 to 2016, inclusive, after commissioning in 1965. The identifi ed failures led to a loss of power and, consequently, to the need in repair of the power transmission line. The mathematical relationships of the estimation of reliability indicators are presented in the form of failure rates and the time between failures, both by the length of the transmission lines and by the time of operation. The novelty of this paper is that for the fi rst time in the Lower Volga region, studies have been carried out on reliability of high-voltage transmission lines with a voltage of 110 kV. Based on the results of the research, specifi c numerical values of failure rates and estimates of time between failures were obtained by the length of the transmission lines and by the time of operation. To establish the law of distribution of failures, an agreement criterion (chi-square) is given. It is found that the distribution of failures of power transmission lines (110 kV) obeys the exponential distribution with length parameters λп = 0.0011 (1/km), Tп = 1265 km, λв = 0.0049 (1/hr), Tв = 257 hrs. The resulting estimations of reliability parameters are recommended to use for creating state-of-art modern highvoltage transmission lines.

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