Ungrounded: There is no intentional ground applied to the system-however it's grounded through natural capacitance. This decreases the current at the fault and limits voltage across the arc at the fault to decrease. Ground fault current magnitudes depend on the system grounding method. These high levels typically require line tripping to remove the fault from the system. Ground overcurrent and directional overcurrent. Long term cost reduction (TCO) for trainings and maintenance by reduce variety of relays A fast and selective arc fault mitigation for air-insulated LV & MV switchgear and Relion protection and control relays and sensor technology protect staff and plant facilities for many years. The Art and Science of Protective Relaying, by C. Mason, John Wiley and Sons, 1956. McConnell, Presented at the Pennsylvania Elec-tric Association, May 16-17, 1957. Current Electrode (C): ction is essential for maintaining electrical system safety and reliability. By select-ing appropriate fuses, circuit breakers, and ground fault protection devices, enginee n engaged in rendering. 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.