NER Neutral Earthing Resistor

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 will be connected between the neutral point of the symmetrical three-phase winding and ground. Associated to the measuring apparatus, it will allow detection and control of defaults. Neutral grounding resistors are defined through three 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.

In addition to the resistors, we are able to supply any associated components such as current transformers, voltage transformers, surge arrestors, disconnectors (off load, on load)… in any required configuration.

Most of the time we are able to integrate the resistor and accessories in one single cubicle.

In collaboration with M.S. Resistances, we are the leader in the International Neutral Grounding Resistor market. We can assemble the resistors in any required configuration and can get them type tested.

For your information, you can take a look at our Operation Manual for Installation, Commissioning and Maintenance.

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