Delta/Wye Transformation:
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Ed MacLaren
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Re: Delta/Wye Transformation:
Not sure I understand the question.
Delta-wye is now the most common transformer configuration for stepping down to load voltages.
Ed
Not sure I understand the question.
Delta-wye is now the most common transformer configuration for stepping down to load voltages.
Ed
Re: Delta/Wye Transformation:
Ed, when calculating the power from a generator say, it is easier for me to use the equivalent wye phase voltages rather than the line voltages. This is what we do anyway when we apply the 1.73 factors.
I am saying, I need to scratch out a little diagram to prove to myself that I am not doing it backwards. As long as it is equivalent, should be no problem.
Some of us have been looking at teeny-tiny ICs for so long that we have forgotten what little we ever knew about power. In retirement, I have time to think about such stuff on websites such as this. Who knows, may need to go back to work someday.
Ed, when calculating the power from a generator say, it is easier for me to use the equivalent wye phase voltages rather than the line voltages. This is what we do anyway when we apply the 1.73 factors.
I am saying, I need to scratch out a little diagram to prove to myself that I am not doing it backwards. As long as it is equivalent, should be no problem.
Some of us have been looking at teeny-tiny ICs for so long that we have forgotten what little we ever knew about power. In retirement, I have time to think about such stuff on websites such as this. Who knows, may need to go back to work someday.
Ed MacLaren
Senior Member
Re: Delta/Wye Transformation:
And yes, in a power calculation where the line current and line voltage are used, it doesn't matter whether the individual winding are connected wye or delta.
Ed
Yes, as long as we remember that the root3 factor (1.73) is applied to the currents in a delta connection, and to the voltages in a wye connection.
And yes, in a power calculation where the line current and line voltage are used, it doesn't matter whether the individual winding are connected wye or delta.
Ed
Re: Delta/Wye Transformation:
If you are going to do much power engineering, take the time to get used to a delta. It won't take that long. For the most part, a couple of multipliers and a phase angle are all you need to get used to.
That said:
I don't think you actually stated this, but I assume you are talking about transformers. That is, you would like to transform the primary from a delta to a wye, and leave the seconary as a wye.
Yes, you can do that. But:
1. The basic delta to wye transformation equations are for balanced loads. There are more complex equations for nonbalanced loads, but I think that would be doing things the hard way.
2. The secondary of the transformer remains unchanged. (Maybe this is better stated as the turns ratio remains the same). If you start with a 480 to 208V transformer, you still have 208V on the secondary after converting the primary.
3. You loose some information. You can still calculate line currents and voltages, but to actually calculate the transformer primary voltages and currents, I think you will have to transform back to a delta.
If you are going to do much power engineering, take the time to get used to a delta. It won't take that long. For the most part, a couple of multipliers and a phase angle are all you need to get used to.
That said:
I don't think you actually stated this, but I assume you are talking about transformers. That is, you would like to transform the primary from a delta to a wye, and leave the seconary as a wye.
Yes, you can do that. But:
1. The basic delta to wye transformation equations are for balanced loads. There are more complex equations for nonbalanced loads, but I think that would be doing things the hard way.
2. The secondary of the transformer remains unchanged. (Maybe this is better stated as the turns ratio remains the same). If you start with a 480 to 208V transformer, you still have 208V on the secondary after converting the primary.
3. You loose some information. You can still calculate line currents and voltages, but to actually calculate the transformer primary voltages and currents, I think you will have to transform back to a delta.
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