A two machine power system is shown below Transmission line

Last updated: 6/10/2023

A two machine power system is shown below Transmission line xy has positive sequence impedance of z Q and zero sequence impedance of zo Q X Tel a phase to ground fault with zero fault impedance occurs at the centre of the transmission line Bus voltage at x and line current form X to F for the phase a are given by Va volts and la amperes respectively Then the impedance measured by the ground distance relay located at the terminal x of line xy will be given by