OK, that makes sense.
I guess my question now is given the situation where we have a transformer with now way of telling the internal temperature, can we use the case temperature at all to determine if they are running to hot?
From what I have read online, for some transformers it is completely normal for them to run so hot that you can not touch them.
If my calculations are correct, we are definitely not overloading the transformers.
My supervisors are concerned about the heat because it showed up in an infrared temperature scan. The center transformer is about 20 degrees hotter than the others. We I checked the current for each transformer was 240, 380, 140. With 380 amps being the center transformer. The temperatures in farenheight are respectively 101, 120, 97.
There concern is mainly because of the infrared scans and the age of the transformers (about 20 years). But I told him because of the imbalance, the temperatures will not be the same. We may be able to balance some of the loads, but most of the loads are from single phase lighting panels.
Does anyone think this is really a problem? I'm going to try to get ahold of the transformer manufacturer to see if I can get any specific information, or to possibly see if thermometers can be added to these transformers, but can certainly use any advice anyone can give.
Thanks again for the help
Jamey
