High Resistance Grounding System Advantages
* Keeps plants up and running 24/7/365
* Safer for your employees, equipment and your plant
* Easy to locate fault
* Easy to install
PowerKeepⓇ is an Excellent Choice for a Wide
Range of High Resistance Grounding Applications:
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Process Industries Steel Mills Mining Operations |
Pulp & Paper Mills Power Distributors Internet Service Providers |
"PowerKeep" is a registered trademark ® of Gratek CONTROLS CO.
Features & Capabilities
* Ideal for the continuous process industries where you do not want the process to stop on the first fault
* Offers protection to transformers, generators and drives from ground faults. Low probability of mechanical
damage to transformer when using high resistance grounding
* Available to 6.6 KV
* 600v class packages available as kits
Grounding Comparison Chart
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Standard Practices For Industrial Plants
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Voltage
600 volts and lower
3.3 to 24 kv |
Grounding Method
Solid Grounding & High-Resistance Grounding
Low Resistance Grounding |
|
NOTE: A recent trend on 600-volt and lower systems has been to use high resistance grounding with all the inherent advantages it has to offer. | |
|
Comparative Benchmarks for Various Grounding Methods
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|
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Methods of System Grounding
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Characteristics
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Ungrounded
|
Solid Ground
|
Low Resistance Ground
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High Resistance Ground
|
|
Susceptible to Transient overvoltages |
WORST |
GOOD |
BEST | |
|
Under fault conditions(line-to-ground) Increase of voltage stress |
POOR |
GOOD |
POOR | |
|
Arc Fault Damage |
WORST |
GOOD |
BEST | |
|
Personnel Safety |
WORST |
GOOD |
BEST | |
|
Reliability |
WORST |
BETTER |
BEST | |
|
Economics'(Maintenance costs) |
WORST |
POOR |
BEST | |
|
Plant continues to operate under single line-to-ground fault |
FAIR |
POOR |
BEST | |
|
Ease of locating ground faults(time) |
WORST |
BETTER |
BEST | |
|
System Coordination |
NOT POSSIBLE |
BETTER |
BEST | |
|
Upgrade of ground system |
WORST |
GOOD |
BETTER |
BEST |
|
Two voltage levels on same system |
NOT POSSIBLE |
POSSIBLE
|
NOT POSSIBLE |
NOT POSSIBLE |
|
Reduction in number of faults |
WORST |
BETTER |
GOOD |
BEST |
|
Initial fault current into ground system |
BEST |
WORST |
GOOD |
BETTER |
|
Potential flashover to ground |
POOR |
WORST |
GOOD |
BEST |
PowerKeepⓇ
High Resistance Grounding
Keeps Plants Up and Running
24/7/365
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[Products]
MV Switchgears
LV Switchgears
Motor Control
Centers(MCC)
PowerKeepⓇ High Resistance Grounding Equipments(HRG)
Derived Neutral Grounding Equipments for 3,300V 4,160V 6,600V Delta System