This paper provides an electrical equivalent circuit of a high-resistance grounded (HRG)
power supply transformer to discuss damage at a fault location so long as the fault remains a
line-ground fault. Fault resistance and fault current that have an effect on damage are
included in the equivalent circuit. Three-line diagrams showing fault current flows along with
their vector diagrams are also included. Part II of this paper provides a similar equivalent
circuit for an HRG grounded generator. This paper provides guidance to update the current …

This paper provides the electrical equivalent circuits of high-resistance grounded (HRG)
power systems other than the delta-wye-connected utility power supply transformer included
in Part I of this paper. This paper also provides the HRG of a medium-voltage generator for
connection to an industrial power system and to a utility power system, and this paper
discusses a line-ground fault with fault resistance. Three-line diagrams of ungrounded
power systems are also included to illustrate the HRG application and its effect on the …