Parameter Estimation for three core Underground Cable

For wave propagation analysis it is highly essential to calculate impedance of various types of underground cable. The cable narrated here has three conductors namely core, sheath and armour for each phase. The impedance matrix is not only useful for understanding the circulating currents inside the cable but also it is useful in examining more complex system. The sheath potential is considered virtually zero as the sheaths are grounded at both ends. Therefore, the shunt admittance is absent between different phases as the electric field is constricted to each of the phases. A MATLAB program has been developed to calculate the impedance at various frequency level. The proposed impedance is highly useful for transient analysis of underground cable.