Transformer center tap

[chattahoochee electrical]

I work for a textile co. in Alabama, we presently have our own power distribution system for several plants within a 6 mile radius. We are making plans for the local Power company to serve the plants. Our voltage is around 11,850 volts and the local power company runs around 12,600 volts, we have several 1000 and 1500 kva pad mounts at our plants which are multiple tap transformers and all but one are 12,000 volt center tap. This one in question is a 11,400 volt center tap which is the oldest of the lot ,installed in late 1960's. The transformers with the 12,000 center taps can be moved two taps to end up close to the power company 12,600 volt. I have concern about the 11,400 center tap, I will wecome any input and info.

 

[zog]

I work for a textile co. in Alabama, we presently have our own power distribution system for several plants within a 6 mile radius. We are making plans for the local Power company to serve the plants. Our voltage is around 11,850 volts and the local power company runs around 12,600 volts, we have several 1000 and 1500 kva pad mounts at our plants which are multiple tap transformers and all but one are 12,000 volt center tap. This one in question is a 11,400 volt center tap which is the oldest of the lot ,installed in late 1960's. The transformers with the 12,000 center taps can be moved two taps to end up close to the power company 12,600 volt. I have concern about the 11,400 center tap, I will wecome any input and info.

Yep. you may have a problem, good thing is you can have the tap changer modified, but with a unit that old replacement may make more sense. I am guessing the poco will be giving you 12,470, that is an easy voltage for a small pad mount like you have.