M.S. RESISTANCES

Neutral Grounding Resistors

Neutral Grounding Resistors (NGR) or Neutral Earthing Resistors (NER) are designed to detect and limit fault currents within a three-phase power transformer or generator.The resistor is connected between the neutral point of the symetrical three-phase windings and the ground.Associated to measuring apparatus, it will allow detection and control of defaults.

Neutral grounding resistors are defined through 3 main parameters :

• Network voltage (Un) or rated voltage (Ur = Un / √3)
• Fault current (In)
• Rated fault duration