Equivalent single-phase networks for calculating short-circuit currents due to grounds on three-phase star grounded systems

H. M. Trueblood: The question of the degree of precision worth while in estimating short-circuit currents in power networks presents itself as of immediate importance as soon as consideration of the problem of the induetive effects of these currents in exposed communication circuits is undertaken; for it is necessary only to glance over a single-line diagram of a large modern power system to realize that an exact calculation of the distribution of residual current due to an arbitrarily located fault to ground will be a lengthy, difficult and expensive proceeding.