This method supplies phase-to-neutral connected loads without the risk of finding dangerous neutral-to-ground voltages when a ground-fault arises. Additionally, straightforward ground relaying schemes isolate the defective portions of the network. However, high-impedance ground fault detection is difficult in multigrounded four-wire systems, in which the relay measures the ground fault current combined with the unbalance. Solidly Grounded: There is a connection of transformer or generator neutral directly to station ground. Why? If you get a second ground fault on adjacent phase, watch out! Why the power system needs to be. While ground-fault protective schemes may be elaborately developed, depending on the ingenuity of the relaying engineer, nearly all schemes in common practice are based on one or more of the methods of ground-fault detection discussed in this article. Distribution circuits that are solidly grounded. How to Detect a GF? How Does it Work? Product Standard? How To Troubleshoot? 3. Incorrect CT Polarity When Using Residual Current Method 4. Ground fault relays can be incorporated in dc systems, ac systems, solidly grounded systems, resistance-grounded systems, and systems carrying capacitive charging currents. Direct current. Generator protection covers: phase-to-phase short circuits in stator windings, stator ground faults, inter-turn short circuits in stator windings, external short circuits, symmetrical overload, stator overvoltage, single- and double-point grounding in the excitation circuit, and loss of excitation.