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Transformer Theory

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As of December 15, 2006
Existing 15kVA transformer:

  • Gather data relating fault currents to phase voltage
  • Determine relation between fault and load currents
  • Obtain fuse elements capable of protecting transformer
Shorting mechanism:
  • Detailed fault current modeling
  • Thermal analysis for conductor sizing
  • Size fuses to clear fault within 2-3 cycles
  • Safe enclosure designed for fuse bank
Test bench design:
  • Obtain dimensions of transformer
  • Bench must be functional and aesthetically pleasing
Final testing with 55kVA transformer:
  • Fault signature not as apparent in phase quantities
  • Filtering with MathCAD relay model necessary to determine fault signature
  • Results used to design special differential protection scheme
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Last updated: 4/25/07.
University of Idaho, Moscow, Idaho.