grounding resistor / current / neutral

The Neutral-Grounding Resistors (NGRs) are designed for ground power systems by using a resistor between the system neutral and ground. This product minimize the prospective ground-fault current to a pre-established value. With a properly placed resistance-grounded system gives benefits over both ungrounded and solidly grounded systems. This resistors functioned as the system is grounded, temporary overvoltages do not show and groundfault current can flow, allowing it to be known and measured. The resistor also used when it is grounding the system, the large and destructive ground-fault currents of solidly grounded systems are unknown. Meanwhile, the ground-fault relays is used on feeders to give selective coordination and to quickly place or isolate the fault.