jegues said:
I determined that the OCT was conducted on the LV side and the SCT was conducted on the HV side.
That seems logical. Is that how you arrived at that--based on common sense? Because I suppose it would not be beyond the bounds of possibility for someone to come up with a disasterous design where this was not the case; where you really did have to apply 50% of the supply voltage in order to get the full rated current on s/c test! It would be a very inefficient transformer.
I was told in class that rated load (which implies rated current) does not always mean rated voltage!
You're saying "does not always mean
exactly, precisely 1000.00 volts", are you?
Short answer: I forget. :(
Longer answer: It most likely is true that rated load (which implies rated current) does not always mean while delivering the exact rated voltage. For the simple reason that the answer you get would be very little different from what you'd get if, during tests, you really did go to all the trouble of adjusting the primary voltage until the secondary terminal voltage was precisely 1000.00 volts under load. And after all your extra effort, the figure would probably be less helpful to users, when in practice they are concerned with the actual terminal voltage when supplied from actual mains.
Think about it. Choose any transformer model and calculate regulation (at rated current) when E is 1000.0 volts. Now calculate it again, but for E of 1013.0 volts, or whatever you'd like it to be so that V equals 1000.0 volts. With the higher E, the load voltage will now drop by just a tiny tiny bit more under full load, leading to your calculation of regulation being almost identical as when you didn't involve all the expense of providing a heavy-current variable 100-115vac supply for practical testing of the transformer.
The biggest difficulty I have is reading the questions and pulling out the information they are giving me based on rated "this", and rated "that".
I recall, now with amusement, how my class had a lecturer who clearly didn't understand the
per unit system for analysing transformers that he was trying to teach us. You may not have heard of it, but
per unit is a way to simplify the analysis of large power systems. Well this particular lecturer folded his arms and refused to mark our lab reports until we re-worked them in the way he insisted we should, even though we pointed out that this was plainly wrong because it attributed to the transformer an efficiency of greater than 100%. But he was adamant. So we re-worked the calculations, and got our reports marked! Everyone passed the subject.
It was a lesson in life, that no one is perfect!
Though I didn't accept it with such equanimity at the time.
