Neutral Grounding Resistors
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Neutral Grounding Resistors

Neutral grounding resistors 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 symetrical three phase windings and ground.
Associated to 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)neutr_gr_resist1
- Fault current (In)
- Rated fault duration
For more details, please take a look at "grounding".


M.S. Resistances is the leader in the International Neutral Grounding resistor market. We can assemble the resistors in any required configuration & can get them type tested.

M.S. Resistances can design NGRs as per your requirements. However, following basis shall be taken into consideration.
- Up to 36 kV rated networks, cubicles will be grounded.
- At 52 and 66 kV, NGRs can be proposed either with grounded cubicles or with live cubicles.
- Over 66 kV, NGRs will be provided with live cubicles only!

We can use different protection level (IP level) for NGR such as IP23, IP 54 & IP 55.

In addition to the resistors, M.S. Resistances is able to supply any associated component such as current transformers, voltage transformers, surge arrestors, disconnectors (off load, on load)... in any required configuration. (see our accessories web page).
Most of the time we are able to integrate resistor and accessories in one single cubicle.

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

Our Neutral Grounding Resistors manufacturing Process does follow the best quality Charts :
- See attached ITP (Inspection & Test Plan).
- See all our NGR Type tests.