An Algorithm for Digital Impedance Calculation Using a Single PI Section Transmission Line Model

This paper presents a digital impedance calculation algorithm which does not require prior filtering of transmission line voltage and current signals to remove either transient DC offset components or transient high frequency components before calculating the impedance of the line. The algorithm is based on a signie equivalent πsection model of a transmission line. Computational requirements of the algorithm are presented and compared to those of a corresponding algorithm which requires prior filtering out of transient high frequency components before the impedance of the line is calculated.