Neutral Grounding Resistor: What Is a Neutral Grounding Resistor Used For?
Equipment safety is a fundamental aspect of electrical power system management. In the event of a fault, power transformers, generators and other electrical components may be exposed to potentially serious damage.
To keep the current within safe limits, a neutral grounding resistor can be installed between the system neutral and ground.
This solution helps protect electrical equipment while improving the overall safety of the installation.
What Is a Neutral Grounding Resistor?
A neutral grounding resistor, also known as a neutral earthing resistor, is a resistor installed between the system neutral and ground to keep the current within safe limits in the event of a fault.
With direct grounding, resistance is limited to the resistance of the ground itself. By installing a resistor between the neutral and ground, it is possible to increase the resistance of the electrical system and limit the current generated during a ground fault.
The main purpose of this type of resistor is therefore to protect power transformers, generators and other electrical equipment from the possible consequences of a fault.
What Are the Advantages of Neutral Grounding Through a Resistor?
The use of neutral grounding resistors can provide several advantages in the management of electrical power systems.
In particular, these solutions help to:
- improve the safety of equipment installed in medium- and high-voltage power systems;
- reduce operating and maintenance costs;
- increase the overall safety of the installation in which they are used.
A neutral grounding resistor therefore plays an important role, especially in power systems where equipment protection and operational safety are key priorities.
When Are Neutral Grounding Resistors Used?
Neutral grounding resistors are used when direct grounding is not sufficient.
They are particularly suitable for electrical power systems in which a fault could have significant consequences for the equipment or the operation of the installation.
Typical applications include:
- hospitals;
- industrial plants;
- power plants;
- mining sites.
These are environments in which particular attention must be paid to safety and to the protection of installed electrical components.
Fairfild: Custom Solutions for Neutral Grounding
Fairfild develops customised resistors based on the specific requirements of each customer and offers a wide range of resistors that can be used as the core components of neutral grounding resistor systems.
The available resistors have protection ratings ranging from IP00 to IP65 and maximum operating voltages of up to 27.5 kV.
The main features of Fairfild solutions include:
- wire-wound resistors on tubular or saddle-shaped ceramic supports;
- power ratings ranging from 15 W to 3.5 kW;
- sealed and unsealed versions;
- sealed solutions suitable for extreme weather conditions;
- filled and unfilled resistors for increased thermal capacity.
Choosing a dedicated neutral grounding solution helps protect electrical equipment and improve the overall safety of the installation.
Thanks to its ability to develop customised resistors and provide different configurations, Fairfild can meet specific customer requirements with solutions designed for this particular application.
