ECN Forum Forums Technical Discussion Electrical Theory and Applications Variable transformer

At the maximum voltage level of the transformer:

121kVA = 280V x 250A (3P).

To set the OCP for 291A @ 240V would allow the transformer to overload if it was adjusted to 280V. If this were a normal transformer and you could lug it to the 240V terminals, OCP can be sized for 291A, but in this case, 250A is required for safety.

[This message has been edited by SteveFehr (edited 11-14-2006).]