transformer question
transformer question
(OP)
What will happen if I power a 5kva 480v primary transformer on 400v, besides the lower voltage on the secondary.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: transformer question
RE: transformer question
The problem seems to be in "besides the lower voltage on the secondary", which can be interpreted in several ways. Two of them are:
1. I conncet primary to 400 V (besides the connections on the lower voltage side). What happens then?
2. I connect to primary 400 V. What will happen then? Besides that I get a lower secondary voltage?
I think that interpretation #2 is the right one.
Then, Scotty is correct. You can get the same current as before.
A couple of secondary effects are that the iron losses decrease, so you may load the transformer a little more and still not overheat it. The inrush and the Isc will be lower.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: transformer question
If the consumer is pure resistive the required power will be V^2/Rcons [so will drop to (5/6)^2 as Skotty said].If the consumer will be induction motor the torque will drop to (5/6)^2=70%[the motor could stop] but the current will be starting current reduced to 5/6 [may be 5 times the rated].
RE: transformer question
Where is that post of yours that I answered?
Your post (another one, I think) is now posted later than the one I answered. An act of relativity theory, space-time physics - or what?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: transformer question
RE: transformer question
RE: transformer question
Usually the secondary rated voltage of a 480 V transformer is 240 V. So will be 240/1.2=200 V- the new voltage. It is only 200/220[90.9%] but it could work.
If they are lightly loaded it looks fine.