A current transformer for microsecond pulses

A toroidal current pulse transformer suitable for the measurement of large microsecond current pulses is described. An accuracy of 2 percent was obtained in reproducing approximately rectangular pulses over the 0.5- to 20-µs range for amplitudes up to 250 A. The transformer gave agreement to 5 percent with a Rogowski coil system for currents up to 70 000 A.