Rated dynamic current78.75 kApf)Rated insulation levelsi)1.2/50 micro second impulse voltage±170 kVpii)1 Minute power frequency withstand voltage70 kV (rms)g)One minute power frequency3.0 kV (rms)withstand voltage betweensecondary terminal & earthh)Maximum temperature rise over an ambient temperature of 50o CAs per IEC 60044-1i)Radio interference voltage at 1.1 Un/√3 and frequency< 1000 Microrange 0.5 to 2 MHzvoltsj)Rated continuous thermal current125% on alltaps