For low values of grounding resistance, the fault current will be high and the damage due
to ground faults may be great. As the value of the grounding resistance decreases, however, the
sensitivity of the ground relays decreases, since less of the available voltage will appear across
the zero-sequence network, as shown in Figure 18.4. The ground relays respond to the voltage
across the grounding resistance, and this voltage must be of a reasonable value for good relay
sensitivity. Some engineers consider this to be an advantage, in a way, since the ground relays
are less likely to operate for faults on the low voltage side of the GSU transformer. Others