A neutral grounding resistor (NGR) is a resistor installed in the neutral-to-ground connection of a power system to limit line-to-ground fault current. By controlling fault current, an NGR can reduce equipment damage risk and support a more manageable response to ground faults in many industrial and commercial systems.
NGRs are commonly used as part of resistance grounded systems. In high resistance grounding (HRG) packages, the NGR is typically combined with monitoring and ground-fault detection features, and some solutions add pulsing and feeder-level fault detection to help narrow down where a fault is occurring.
Bender HRG solutions integrate an NGR assembly as part of a complete solution (examples include HRG Series 1, Series 2, and Series 3). Bender also offers neutral grounding resistor monitoring devices such as the LINETRAXX NGRM700 for monitoring resistor failures and ground faults.
