NGR Series - Neutral-Grounding-Resistor System

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Neutral-Grounding Resistors (NGRs) are used to ground power systems by inserting a resistor between the system neutral and ground. This lowers the prospective ground-fault current to a predetermined value. A properly designed NGR system provides benefits over both ungrounded and solidly grounded systems. Because the NGR  system is grounded, transient overvoltages do not occur and groundfault current can flow, allowing it to be detected and measured. Also, because an NGR is used to ground the system, the very large and destructive ground-fault currents of solidly grounded systems are absent. Ground-fault relays (such as the SE-701) can be used on feeders to provide selective coordination and the ability to quickly locate or isolate the fault.

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