Driving point and transfer impedance computation

THERE ARE a number of power system problems in which the driving point and transfer impedances of the network are required. In the past, the network analyzer has been widely used to determine these impedances by measurement; however, there is a serious question as to whether the accuracy obtainable with analyzer measurements is sufficient for all purposes. An example where analyzer accuracy is questionable is in the determination of open-circuit impedances, sometimes referred to as self and mutual impedances, for use in loss equations. Several methods of computing such impedances digitally have been described.¹