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how many coils away is the power leg from the neutral bushing of the lighter transformer
1 1/2
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the lighter transformer has a ______ KVA rating than the power pot
larger
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the lighting transformer supplies the _______ of the single phase load and half of the three phase load
majority
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what is the voltage form the power leg to the neutral of the lighting transformer
208
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what is the voltage from the power leg to any hot leg on the lighting transformer
240
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if you accidentally connect the power leg to a hot leg at the customer's serice, what could be the consequences
damage 120v electrical appliances
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if the primary coil voltage of a transformer is the same as the phase to phase voltage of system the transformer will be connected wye or delta
delta (system voltage)
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how many primary phases are required to connect open wye primary to provide three phase open delta secondary
2
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can open wye secondary provide three phase power using two transformers
no
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can you get 3 phase 120/208 from an open delta bank? what is the three phase voltage from an open delta bank on the secondary side
no; 120/240, 240/480
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can two or three single phase transformers be connected to supply three phase service
yes
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if the primary side of two transformers are connected to two phases and a neutral, is this a wye or delta connection
wye
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can you get three phases secondary using two phases of the primary? how would that primary connection be configured, wye or delta
yes; wye
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how do you swap rotation on three phase transformer
swap 2 hot legs on the lighting transformer
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how many phases are required on the primary side of an open delta/open delta bank
3
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how will the secondary on a 2 pot bank always be hooked up
delta
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what is an open bank
two transformers banked together to supply 3 phase secondary power; one leg of the delta or wye configuration is gone or open
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how many phases does it require to to deliver proper output voltages on a open delta primary connection
3
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how many phases does it require to deliver proper output voltages on a open wye primary connection
2
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open banks are only ____ as efficient as closed banks (closed banks have 2 transformers
57.7%
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how do you connect the primary on an open bank delta
- transformer 1 - H1 to A phase, H2 to B phase
- transformer 2 - H1 to B phase, H2 to C phase
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how do you connect the primary connections on a open bank wye
- transformer 1 - H1 connects to A phase, H2 to neutral
- transformer 2 - H1 connects to B phase, H2 to neutral
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how do you connect the secondary on open bank wye and delta (subtractive transformer)
- lighter transformer - X1 to phase, X2 to neutral, X3 to to X1 on power transformer
- power transformer - X1 to X3 of lighting transformer, X2 open, X3 to power leg
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