21/30438133 DC

Instrument transformers, Electrical insulation, Type testing, Rated voltage, Leakage paths, Temperature-rise limit, Electromagnetic compatibility, Impulse voltages, Performance testing, Marking, Grades (quality), Environment (working), Electric enclosures, Ratings, Electrical measurement, Temperature, Mechanical testing, Electrical insulating materials, Windings, Electrical equipment, Accuracy, Transformers, Classification systems, Capacitance measurement, Partial discharges, Rated current, Impulse-voltage tests, Electrical measuring instruments, Electrical testing, Withstand voltage, Overvoltage tests, Dielectric measurement