oddball transformer sizes

[reppy007]

Has anyone seen any odd ball transformer sizes or wondered why they have some sizes that are urd and not overhead.When I was younger you didnt see 37.5 kva urd transformers,later on you might see a few...Ive never seen a overhead 37.5 kva.Overhead transformers were 5kva,10kva,15kva 25kva,75kva,100kva,167kva,250kva,333 kva and 500kva...urd 25kva,37.5kva,50kva,75kva,100kva,167kva,250kva,and thats around these parts.Later on in another state there were larger Urd transformers that Ive worked on,So I guess what Im asking is if anybody has worked a kva size between those sizes that I have typed down,or is there such an animal as a 37.5 overhead....I cant see why not.

[Lineman North Florida]

Plenty of 37.5 and 50 kva overhead pots out there.

[reppy007]

My mistake with the 50 kva,we have them ,sorry......not overhead 37.5s...unless I just cant picture them.

[THE KID]

We hang tons of 37.5 KVA

[reppy007]

Ok how about this one....how many 167kva transformers or above have you seen get replaced due to overload?..maybe just a handful?

[THE KID]

I haven't had to replace 167 because of overload but we also have some 333KVA Tx also never replace them either.

[kooman]

we probably have more 37.5's overheads than just about any other size. over the years we have pulled down several 7.5 kva overhead pots.

[reppy007]

Was that a mistake? 7.5 kva overhead pot.

[Orgnizdlbr]

Taken 37.5s down, we hang 50s in their place, oh I mean overhead Rep

[kooman]

Was that a mistake? 7.5 kva overhead pot.

No sir it was not a mistake, taken down several old 7.5 kva pole mount transformers. since 7.5 is exactly halfway betweene 5 and 10 it fit the bill back when the loads were very low, 5 was too small and 10 was to big, (lol a 10 kva trans too big). Just like 37.5 is halfway betweene 25 and 50, alot of times a 25 is too small and a 50 would be overkill.