Industrial power resistors, dynamic braking, load banks, low resistance grounding, high resistance, grounding, harmonic filters, motor controls, resistor element types
High Resistance Grounding Comparison Chart
Standard Practices For Industrial Plants

Voltage
600 volts and lower
2.4 to 35 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
  Methods of Grounding
Characteristics Ungrounded Solid Grounded Low Resistance High Resistance

Immunity to transient over-voltages

Worst

Good

Good

Best

Increase in voltage stress under line-to-ground fault conditions

Poor

Best

Good

Poor

Equipment protected against arc fault damage

Worst

Poor

Better

Best

Safety to personal

Worst

Better

Good

Best

Service reliability

Worst

Good

Better

Best

Maintenance cost

Worst

Good

Better

Best

Continued production after first ground fault

Better

Poor

Poor

Best

Ease of locating first ground fault

Worst

Good

Better

Best

Permits designer to coordinate protective devises

Not Possible

Good

Better

Best

Ground fault protection can be added easily

Worst

Good

Better

Best

Two voltage levels on the same system

Not Possible

Best

Not Possible

Not Possible

Reduction in frequency of faults

Worst

Better

Good

Best

First high ground fault current flows over grounding circuit

Best

Worst

Good

Better

Potential flashover to ground

Poor

Worst

Good

Best

Video Tutorial
HIGH RESISTANCE GROUNDING HR103-08

More Information
HIGH RESISTANCE GROUNDING- IEEE
HIGH RESISTANCE GROUNDING APPLICATION GUIDE HR003-05
HIGH RESISTANCE GROUNDING CASE STUDY - MARATHON OIL
HIGH RESISTANCE GROUNDING CONVERSION GUIDE HR002-05
HIGH RESISTANCE GROUNDING PULSER PLUS PRO INSTALLATION MANUAL HR106-06
HIGH RESISTANCE GROUNDING TECHNICAL PAPER
HIGH RESISTANCE GROUNDING BROCHURE HR001-05
HIGH RESISTANCE GROUNDING OEM KIT HR203-07

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