Berezka S. Defining of thresholds earth resistance on overhead transmission lines using the simulation

Subject of the inquiry: interrelation of tower's grounding devices resistance value of overhead lines with a lines switch's resource. Purpose of the study: improvement of methods of determination of tower's grounding devices resistance limit values of overhead lines. Research methods: methods of the theory of electromagnetic circuits, statistical tests, symmetric components, probability theories. Theoretical results and application: development of algorithm and software for determination of tower's grounding devices resistance limit values of overhead lines of 110 kV and above, calculation of the induced voltage on working grounding of power line that can be used at design and operation of overhead lines. Novelty: elaboration of a method of determination of tower's grounding devices resistance limit values of overhead lines 110 kV and above by line switch resource expenditure simulation with using single-phase short-circuit currents models. Improvement of method of definition of lightning shutdowns expected number of overhead transmission lines of 110 kV and above using the stochastic modeling of insulators garland pulse overlapping and lightning current waveform model. Implementation: results are used in "Ukrenergomerezhproekt" institute for projecting of overhead lines grounding devices and in education on electric energy transmission chair of NTU "KhPI". Recommendations for work under the induced voltage are implemented in North power system of NEC "Ukrenergo". 05.14.02.