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Charging Current Data for Guesswork-Free Design of High-Resistance Grounded Systems

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1 Author(s)
Baker, D.S. ; Central Engineering Division, Brown & Root, Inc., Houston, TX 77001.

The design of high-resistance grounded power systems requires the sizing of the grounding resistor to provide a current flow equal to or greater than three times the system charging current (Ico) of each phase. In industrial power systems the insulated power cables are a major source of system charging current which flows into line-to-ground faults. Data are presented which will allow cable charging currents to be quickly and precisely determined after the cable size, voltage, footage, insulation type, and thickness have been determined. Charging current data for transformers, motors, generators, and capacitors are also included.

Published in:

Industry Applications, IEEE Transactions on  (Volume:IA-15 ,  Issue: 2 )

Date of Publication:

March 1979

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