Initial Specifications



Transformer Theory

Test Circuit


Thermal Analysis



Schweitzer Engineering Laboratories, Inc. (SEL) has requested the transformer with primary, secondary, and tertiary windings to include:
  • 240/240/24 Volts.
  • 25/25/2.5 kVA (or 50/50/5.0 kVA).
  • 480/480/48 turns (1/2 Volt per turn).
  • Windings should have leads left open so they can be connected in testing to a specific formation: delta or wye.
  • Taps from turns at specific locations: 2, 4, and 8 winding turns and 1%, 2%, 5%, and 10% of the winding. Use only 2, 4, and 8 winding turns in tertiary. Taps should come from the turns to a plate of some kind and be well-marked.
  • 3-phase, 3 legs (If cost will be too high, only put taps on middle leg.).
  • Thermocouples to measure heat.
  • Search coils to measure flux.
  • Wire size should be rated for dry use—may be immersed in oil later.
  • Core needs to be as small as possible.
During the time we create the test bench, we will also be creating a safety procedure as we do some initial testing on an existing transformer. Specific safety concerns to be researched are listed:
  • Safely short circuit transformer when there is a huge current running through a small number of turns. Possible solutions include current transformers, switches, fuses, and circuit breakers.
  • Transformer must not be ruined.
  • Students and the surrounding environment must remain safe during all testing.
  • We need at least ten duty cycles to read a measurement
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Last updated: 4/26/07.
University of Idaho, Moscow, Idaho.