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Recent content by Gibbs

  1. Gibbs

    Arcing Ground Faults

    I have a 3 phase, 4-wire, 120/240 volt delta service to a machine shop. I have recently had some 3 phase equipemnt damaged: an inverter, transformer, and 2 three phase surge protectors damaged from high voltage. There was no damage to any single phase equipment. I suspect an arcing ground...
  2. Gibbs

    zig zag grounding transformer sizing

    A zig-zag grounding bank is typically used to provide a source of fault current so a phase to ground fault on a delta system can be detected and interrupted.  The bank is sized based on the neutral current and the phase to ground voltage multiplied by a constant "K" which is...
  3. Gibbs

    Blown fuse element indicator

    You didn't mention your application so neither of these may be useful.  The old type plug fuses that screw into a fuse holder indicate they're blown (max rating is usually 30 amps or less).  Bussman makes an R-rated fuse that has a small pin in the end which is pushed outward...
  4. Gibbs

    Fero- resonance

    Try ANSI/IEEE C57.105-1978 or later.  Section 7, page 22 has a good discussion of Ferroresonance.  Best of all, Section 9.2, page 32 has a bibliography with 27 references on Ferroresonance.  Item [8], "Abnormal Voltage Conditions Produced by Open conductors on...
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