week 3 Flashcards
a phase to neutral connection is a ________ connection?
Wye
the _________ leg is 1 1/2 coils from the neutral
power
the power leg has ______ volts by itself but will supply the third phase of 240 needed for three phase power
208
what type of open bank connection : H1’s to phases and H2’s connect and may or may not be grounded?
wye primary
in an open bank the larger of the two KVA rated transformers is the ?
lighter pot
what is the only way an open bank secondary can be hooked up?
delta
what directly affects how the transformer will be wired?
circuit voltage
7200/12000 on a transformer nameplate and 12000 volts on a system would be what primary connection?
delta
small nameplate voltage to small system voltage ?
wye primary connection
determined by the engineering department?
KVA rating
utilities prefer to install what verses a single three phase transformer?
three single phase transformers banked together
phase current is 1.732 times higher than coil current in a _____ system
delta
phase voltage is 1.732 times higher than coil voltage in a _____ system
wye
which transformer has the larger KVA in a open bank?
lighter
an open bank is _____% less efficient than a closed bank
57.7
