Impulse Current Waveform Compliance with IEC 60060-1

Abstract

After numerous simulations, authors could unsuccessfully design an impulse current calibrator, whose output's time parameters (front time, T₁ and time to half the peak, T₂ ) are quite close to ideals defined in IEC 60060-1. The investigation for the failed trial was commenced. Using normalized damped oscillating waveform e^-tsin(ωt), a relationship of the ratio T₂/T₁ and undershoot value are studied for all possible value for . With this relationship, it is derived that 1) one cannot generate an ideal wave form unless one has to accept a certain margin for the two parameters, 2) even with the allowable margin, one can generate a wave form only in a case a value for T₁ is smaller and T₂ is larger than standard values. In the paper, possible time parameter combination, which fulfils IEC 60060-1 requirements, is illustrated for a calibrator design.