In a resistance grounding system, a resistor is connected from the source wye point to the ground with a grounding conductor for minimizing fault currents.
A hybrid resistance grounding (HRG) system is most suited in systems with medium-voltage  generators.
Panetta, "Advanced concepts in high resistance grounding," in Petroleum and Chemical Industry Technical Conference (PCIC), 2012 Record of Conference Papers Industry Applications Society 59th Annual IEEE, pp.
The code which implements the methodology set out in the paper allows on the basis of the relevant electrical measurements to evaluate not only the resistance of the grounding of electrical devices, but also as its own and mutual resistance grounding
all the electrodes in a three-electrode setup measuring the resistance of the grounding device.
When the high resistance grounding fault occurs at the fault point F1, the fault component current differential protection and zero-sequence current differential protection are correct to operate, but segregated phase current differential protection refuses to operate.
When the high resistance grounding fault occurs at the fault point F4, segregated phase current differential protection and fault component current differential protection refuse to operate.