Neutral Grounding Resistor Wiring Diagram. Where one ner serves all the transformers at the substation the maximum 11 kv earth fault current is usually independent of the number of transformers and is determined largely by the ner value. The se 325 is a neutral grounding resistor monitor for resistance grounded systems up to 25 kvac.
In solid grounding the system is directly grounded and the fault current is limited only by the soil resistance. Install the cable entrance bushing in the hole provided and tighten securely if applicable. A neutral grounding resistor limits the fault current to a value which is sufficient enough to operate protective relays yet prevent unwanted fault damage.
41 neutral lead resistor only or step down transformer with resistor typical connection diagram grounding resistor typical connection diagram step down transformer the neutral lead from the transformer or generator may be connected one of five ways depending upon the specific design.
Handbook for application of neutral earthing resistors ners at the substation. Neutral grounding resistor wiring diagram. The line to neutral voltage will be 480 v 3 277 v. Than 40 percent of the rating of the neutral grounding resistor ii.