Grounding is commonly used in the electrical industry to mean an intentional connection to earth of conductive materials either solidly or through impedance. An ungrounded system is a system, circuit or apparatus in which there is no intentional connection between the system conductors and earth. A system may still be considered ungrounded if there is a possible connection to earth ground through potential measuring devices or very high impedance devices. High resistance grounding, for medium-voltage systems, less than 5 kV, means that a certain resistance has been intentionally put between the neutral point of a system and earth ground.
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Medium-voltage high resistance grounding
Eaton’s high resistance grounding system limits the magnitude of current during a ground fault, reducing arc-flash energy to increase personnel safety and minimize the failure of motors, transformers, power cables and other equipment. Providing integrated fault tracing for easy detection, the solution is ideal for critical applications such as industrial, oil and gas, petrochemical, healthcare and utility.
VOLTAGE CLASS
Up 5 KV
GROUND FAULT LIMITING
1 – 10 Amps,
1 A increments
1 A increments
SHORT-CIRCUIT WITHSTAND
Up to 200 kAIC
Core features
- Provides ground fault detection and integrated fault tracing for quick resolution
- Enhances personnel safety by reducing the risk of arc flash
- Built-in alarm alerts operator of problem
- Available with a Wye connection with neutral option or Delta connection with artificial neutral option
- Stand alone in NEMA 1 or NEMA 3R enclosure (MVHRG), custom ratings and options available
- Ground fault limiting up to 5 A with MVHRG, custom up to 10 A available
Customized or specialized high-resistance ground
Eaton’s medium-voltage HRG, available in a variety of ratings and configurations to protect against overvoltage conditions, can be application-engineered to apply a customer's desired requirements. From a small footprint to accommodate floor space restrictions and NEMA 1, 3R and 4X stainless-steel, to options such as ungrounded until ground fault and high-resistance ground without a signal blocker, Eaton’s custom HRG units enhance safety and extend runtime.
Factors to consider when choosing a grounding system:
- There is a need for service continuity after the first ground fault
- There is a need to be able to easily locate ground faults
- There is no need to serve line-to-neutral loads
- If there is no available neutral, it will be necessary to create an artificial neutral
- It will be necessary to estimate, calculate, or measure the capacitive charging current of the system
- The magnitude of maximum current acceptable on the system under ground-fault conditions
Eaton’s Electrical Engineering Services and Systems
With more than 1,500 experts in 60 locations throughout Canada and the U.S., and more around the world, Eaton’s Electrical Engineering Services and Systems team is one of the largest and most experienced service organizations in the industry.
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