Answer / pramit dutta

according to condition of paralleling of two or more 3 phase transformer banks ,the phase shift between primary and secondary voltages must be same. it follows that all transformers in same main group can be connected in parallel.

Answer / raul

Yes, it is possible to parallel the YD11 AND DY1. Because
they lie in the same phase difference group family of the
paralleld connections. Since the phase angle difference
between the primary and secondary in both the cases is 30
degree lead and lag.

The possible parallel connections are :
1) YD1 AND DY11
2) YD11 AND DY1
3) DD0 AND DD6
4) YY1 AND YY11

Answer / 7anoter4

You can turn DY1 into DY11 by swapping phase B with W.See:

http://files.engineering.com/getfile.aspx?folder=df1b9784-
7409-4333-a537-
780523d888a8&file=How_to_turn_a_Dy11_transformer_into_a_Dy1.
pdf

Answer / 7anoter4

It is not possible since there are not the same phase angle
shift [they have to be in the same group of connections]
See:

http://electrical-engineering-portal.com/principles-of-
transformers-in-parallel-connection-1

1- XC and the RC time constant are both measures of the reaction of C to a change in ____? 2-The power factor is a numerical ratio with a value between 0 and 1 equal to the ______________ of the phase angle. 3-When V and I are out of phase because of reactance, the product of V times I is called ______________ power 4-For _____________ inductors, the branch currents can be added algebraically. 5- The ______________ power in watts can be calculated as I^2R 6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL 2*3.141592653*1kHz*30mH =188 ohms Please check) 7-A parallel RL circuit has the values, R = 5kohms, XL = 5kohms. A voltage source of Vt = 10Vrms is connected in parallel to R and L. Determine the total current, It delivered by the voltage source Vt. 8-A series RC circuit has R = 1Mohm and C = 1microF. How long would it take for the capacitor to fully discharge if it is initially fully charged? 9-A circuit has real power = 300W and an apparent power of 500VA. Determine the power factor and phase angle. 10-The time constant for an LR series circuit is T = 0.1s and R = 10ohms. Calculate the inductance L.

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