Problem on Wye-Wye Bank
Problem on Wye-Wye Bank
(OP)
Had a field connection done wrong the other day and wanted some input on the scenario. It was a wye-wye bank.
Transformer # 1: H1=A, H2=N ===> X1=a, X2=n
Transformer # 2: H1=B, H2=N ===> X1=b, X2=n
Transformer # 3: H1=C, H2=N ===> X1=n, X2=c (Incorrect On Sec. Side)
The field guy swapped the secondary connections on the third transformer. So we were getting the 120V out of the bank, but no 208V. I was running into problems when determining the phasor diagram. With the above scenario, what kind of phase angles will I get on the secondary.
Transformer # 1: H1=A, H2=N ===> X1=a, X2=n
Transformer # 2: H1=B, H2=N ===> X1=b, X2=n
Transformer # 3: H1=C, H2=N ===> X1=n, X2=c (Incorrect On Sec. Side)
The field guy swapped the secondary connections on the third transformer. So we were getting the 120V out of the bank, but no 208V. I was running into problems when determining the phasor diagram. With the above scenario, what kind of phase angles will I get on the secondary.






RE: Problem on Wye-Wye Bank
RE: Problem on Wye-Wye Bank
RE: Problem on Wye-Wye Bank
RE: Problem on Wye-Wye Bank
X1=a, X2=n
X1=b, X2=n
X1=c, X2=n
The Journeyman put it on as x1=n, x2=c. I understand the 180 degrees and it being backwards. So the phase angles would be 0, -60, -120. Can explain in a little more detail so I fully understand. I appreciate your time in this matter.
RE: Problem on Wye-Wye Bank
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RE: Problem on Wye-Wye Bank
RE: Problem on Wye-Wye Bank
All 120 volt, single phase equipment should work but there will be heavier neutral loading. The exact neutral currents will depend somewhat on the power factors of the individual loads.
respectfully
RE: Problem on Wye-Wye Bank
So to reiterate, with the secondary bushings as follows:
(Wye-Wye Bank)
X1=a, X2=n
X1=b, X2=n
X1=n, X2=c
Is the following data correct?
a to b = 208V (0 degree angular displacement) ; a to N = 120V
b to c = 120 V (-60 degree angular displacement) ; b to N = 120V
c to a = 120 V (-120 degree angular displacement) ; c to N = 120V
RE: Problem on Wye-Wye Bank
RE: Problem on Wye-Wye Bank
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