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
For more details, please take a look at grounding.
Neutral Grounding Resistors are designed as per your requirements, and additional components such as current transformers, voltage transformers, disconnectors, etc. can be included in the resistor.
For your information, you can take a look at our Operation Manual for Installation, Commissioning and Maintenance.
