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neutral grounding resistors are used in ac distribution networks to limit the fault current which would flow from the transformer or generator neutral star point in the event of an earth fault in the systems. it is used when the neutral of supply transformer is accessible and its own impedance is not enough to limit fault current. the rating of the resistor should be so chosen that the fault current is limited to that necessary to operate the protection relays within the required time.
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power resistors like earthing resistors , neutral earthing resistors , neutral grounding resistors , electrical resistors , buffer resistors , battery discharge resistors , loading resistors , dynamic braking resistors. ,
UPS and Power Supply