Enter the harmonic current spectrum to calculate K-Factor, harmonic loss factors (FHL, FHL-STR), and current THD.
Enter the RMS current (A) at each harmonic order.
UL 1561 transformer rating
IEEE C57.110 winding eddy-loss factor (same formula as K-Factor)
IEEE C57.110 other stray-loss factor (uses h0.8)
Current distortion vs. fundamental (IEEE 519)
Rex Power Magnetics makes no representations as to the accuracy of the information used by or generated by this calculator. K-Factor is calculated per UL 1561 and the harmonic loss factors (FHL, FHL-STR) per IEEE C57.110. The results are provided for general reference only and should be independently verified by a qualified professional before being relied upon. Rex Power Magnetics assumes no responsibility for the results generated by the calculator or for any errors or omissions in connection with its use, and under no circumstances shall Rex Power Magnetics be held liable for any damages arising from the use of, or results generated by, the calculator.