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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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