CONTINUITY OF SERVICE-CRITICAL FOR EQUIPMENT, SAFE FOR OPERATORS
This facility received primary utility service at 2,400 VAC, 3 Phase, 3,000 amps, ungrounded delta. When your client is an industrial facility with a coal-fired boiler providing process steam through a utility interconnected extraction steam turbine-generator, the last thing you want is an accidental ground clearing the fault, and the power needed to operate and control your power plant.
A high resistance grounding package was chosen, including a ground fault current monitoring scheme.
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REGENCY PLASTICS SELECTS I-GARD HIGH RESISTANCE GROUNDING
Ungrounded systems are susceptible to severe overvoltages. When the inductive reactance of the ground fault closely matches the system capacitance to ground, overvoltages as much as ten times normal can be experienced. When these severe overvoltages are created by the ground fault, insulation breakdowns occur and phase-ground-phase faults develop resulting in equipment damage and lost production.
In order to eliminate the severe overvoltages due to ground faults, it is recommended that an artificial neutral (i.e. a zig-zag grounding transformer) and resistance ground be installed along with the appropriate ground fault monitoring equipment and protective fusing.
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