Medium voltage high resistance grounding

VOLTAGE CLASS

Up 5 KV

GROUND FAULT LIMITING

1 – 10 Amps,
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

View design guide (layouts, technical data and application information)

Download guide spec (26 05 95 11)

Learn more about power system design basics

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.

Spotlight application

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.

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

Specifications

Ratings

RATED MAXIMUM VOLTAGE	4160 V
GROUND FAULT LIMITING	1 – 10 Amps, 1 A increments
SHORT-CIRCUIT WITHSTAND*	Up to 60 kA

Standards

ANSI/IEEE	C37.20.2
UL*	Yes
NEMA	NEMA 1 indoor, NEMA 3R outdoor
SEISMIC QUALIFICATION*	IBC, CBC, UBC Zone 4

Devices

RESISTOR	5 A and 10 A resistors, 1 A taps, custom uses 32 A continuous
FAULT DETECTION	Current sensing and/or voltage sensing
FAULT LOCATION	System pulsing
* Not available for custom HRG designs

Enclosure

CONSTRUCTION	Metal-enclosed
POWER TERMINATIONS	Top and bottom entry
ENCLOSURE TYPE	Standalone

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Medium-voltage high resistance grounding

Core features

View design guide (layouts, technical data and application information)

Download guide spec (26 05 95 11)

Learn more about power system design basics

Customized or specialized high-resistance ground

Factors to consider when choosing a grounding system:

View design guide (layouts, technical data and application information)

Download guide spec (26 05 95 11)