21/30387029 DC

High-voltage installations, Dielectric strength, Three-phase current, Overvoltage protection, Overvoltage, Selection, Protected electrical equipment, Electrical installations, Clearance distances, Overhead power lines, Electrical equipment, Withstand voltage, Mathematical calculations, Factor of safety, Surge protection, High-voltage equipment, Statistical distribution, Electrical insulation, Rated voltage, Impulse voltages, Coordination, Classification systems, Stress, Statistical methods of analysis