What KVA is this transformer?

[KyleFowler]

I'm wiring a job where they want to use this transformer from 1983 haha. What is confusing me however is that the transformer seems to have different ratings and isn't a standard size going by the nameplate. However if you look up the model number online two different sources that sell secondhand equipment say it's a 45kva transformer. Going by the tag on the transformer which states the high voltage amps at 480 volt is 54 amps that also aligns with being a 45kva transformer. What's going on? I attached a picture of the tag on the transformer, sorry the image quality isn't the best, that tag has seen better days.

 

[don_resqcapt19]

Never seen that on a small transformer before...The kVA is different based on how hot you want to let the windings get.

 

[jim dungar]

Most small dry type transformers use a base temperature rise of 150°C. If you want to have the transformer run cooler, say 80°, you simply don't load it as much.

 

[KyleFowler]

What was confusing me was that at 150°C it looks like it was only rated for 15kva. But I think that might be a misprint. Or maybe it did originally say 45kva and the tag has degraded to where the 4 now looks like a 1. I will say zooming in it looks like the spacing between the 1 and 5 is awfully far apart on the KVA line compared to the spacing between the 1's and 5's on the temperature rise line.

 

[augie47]

Look at your input amps and the math gives you 45kva (at 150C)... the nameplate is damaged.

 

[KyleFowler]

Look at your input amps and the math gives you 45kva (at 150C)... the nameplate is damaged.

Yeah I believe you are correct. It's just about unbelievable how that 4 turned into a 1 without the other numbers around it being as damaged. I felt like a CSI investigator for a moment zooming in and comparing type spacing LOL

To prevent future confusion I'm going to attach a new label beside the old one clarifying what the transformer is

 

[Jraef]

Yeah I believe you are correct. It's just about unbelievable how that 4 turned into a 1 without the other numbers around it being as damaged. I felt like a CSI investigator for a moment zooming in and comparing type spacing LOL

To prevent future confusion I'm going to attach a new label beside the old one clarifying what the transformer is

I thought it was a 7, but that was even more "unright"... I agree it's a damaged 4.

 

[ptonsparky]

The impedance change was noteworthy to me. I've never noticed it before. Probably wasn't looking either.

 

[ggunn]

Yeah I believe you are correct. It's just about unbelievable how that 4 turned into a 1 without the other numbers around it being as damaged. I felt like a CSI investigator for a moment zooming in and comparing type spacing LOL

ENHANCE!