Transposition study and field measurements of long radial static-reactive power compensated transmission system

Results of a transposition study carried out on the 654 km Muja-Kalgoorlie 220 kV radial transmission system are presented. Voltage control and stabilisation of this network is achieved with the installation of three saturated-reactor type static VAr compensators. By suitable line transposition, it is shown how voltage imbalances at the SVC locations can be reduced to ensure minimal negative phase sequence current loading on the saturated-reactors. The amount of third harmonic current generated by the reactors is also reduced. The accuracy of the simulation results is assessed by comparing the predicted network imbalances with those obtained from field test measurements