COMPUTER ANALYSIS OF OVERVOLTAGE HAZARD DUE TO LIGHTNING DISCHARGES IN MEDIUM VOLTAGE OVERHEAD LINES WITH COVERED CONDUCTORS

Specific medium voltage (20 kV) overhead power lines with cover conductors (the so-called PAS system) are not equipped with bare conductors but covered ones, i.e. covered by a thin resin insulating layer. In effect of such a modification new functional features bring to light in particular considerable less faults and disturbances than in the case of traditional lines [1, 6]. However, overvoltages can threaten these specific lines during thunderstorms and such hazard, caused by direct and nearby lightning strokes, is analysed in the paper.