Abstract
Chosen problems relevant to overvoltage hazard of MV overhead power lines and power cables with polymeric insulation are discussed. Computer simulation results regarding the hazard due to lightning discharges occurring within MV power network systems are presented. These prove that 20 kV power network systems can be threatened by overvoltages during thunderstorms. Maximum values of total overvoltages induced within such conductors in dependence on distance between lightning stroke channel and a line have been estimated. Ill. 5, bibl. 6 (in English; summaries in English, Russian and Lithuanian).
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