Analogue computer methods applied to steady-state A-C system problems

THE GROWING complexity of aircraft a-c power systems has required more and more detailed analysis of the system performance under abnormal conditions, such as asymmetrical loading or asymmetrical faults. These calculations are used to predict the proper setting of the different protection functions and to assure proper co-ordination of primary and secondary protection in the distribution network. Another factor is concerned with the reduction of positive sequence voltage is applied to polyphase a-c motors. These motors are being applied in aircraft in increasing numbers.