02-12-2017, 07:22 PM
(02-12-2017, 06:24 PM)reset Wrote: So you are saying there are no transformers in the system????
Let's see 7.6 Mw at 11 Kv.
P = E * I
I = P / E
I = 6.6 Mw / 11 Kv = 690 amp
690 amp in a single phase system. This being a 3 phase system it would be about 400 Amp per phase.
P = E X I = 11kv X 400 = 4.4 Mw per phase
For three phase multiply by 1.732
4.4 Mw X 1.732 = 7.62 Mw
So the 11Kv feed would be at about 400 Amps when fully loaded.
If your home is fed 400 volts you would draw 1 amp from the 11 Kv line for evey 27.5 Amps you use. So your 200 Amp service would only draw a little over 7 Amps at full load.
The transformer increases the current as it reduces the voltage. A wire the size of your finger can easily carry a Mw at high voltage but would be under rated to power an electric stove at low voltage.
An amp is an amp at any voltage level but it represents a lot more power at 11 Kv than 220V.
