Hi,

I dont understand transformer theory at all so it is all a learning experience for me smile

I now have the data that was monitored:

Main incomer average demand 375kw
Main incomer total 62884 kWh

Phase 1 reading 64130 kWh
Phase 2 reading 59427 kWh
Phase 3 reading 65098 kWh

Poco meter reading 64420 kWh

They state that as the phase 1 reading is so close to the poco meter reading, they have a ct on phase 1 and are multiplying by 3. They state that the difference is within the tolerance of the 2 meters

The poco meter does state 11kv/110v on it. I will check it later.

I may be more confused than ever smile

Thanks

I took my time, I hurried up, The choice was mine, I didn't think enough