Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 20,701
I thought 3 windings on an E core was cheaper than 3 single phase transformers, a bit less steel. Don't remember for sure which they would have installed.
Either way, the price was almost all the labor of hanging a transformer on a utility pole and stringing wires, with insulators on a couple poles, to the 12kV (+/-) pole near by.
I don't know if any other company allowed to do such a hookup.
Of course I could have bought and installed transformers on my own property. But doubt it would be appropriate to bring 12kV to there.
The rules vary on what the neighborhood has. If there was already a low voltage transformer for 3-phase near by, might have been different.
I was trying to get power for future shop tools, 3-phase appliances like HVAC, and my Sunny TriPower.
But that GT PV inverter was rejected for not having the latest grid support and control features required as of 2020, so I backed off to using Sunny Boy. (will substitute Smart Energy which is replacing the discontinued model.)
I'll just use VFD for any tools.
Considered 3x Sunny Island to make 3-phase from single phase, but I haven't found a way to feed 120/240V to them, only 120V, cutting in half the pass-through current. I did get 3x SI to connect but had excessive current flow (using transformers to do vectors off 120/208Y phases to get 180 degrees phase.)
Either way, the price was almost all the labor of hanging a transformer on a utility pole and stringing wires, with insulators on a couple poles, to the 12kV (+/-) pole near by.
I don't know if any other company allowed to do such a hookup.
Of course I could have bought and installed transformers on my own property. But doubt it would be appropriate to bring 12kV to there.
The rules vary on what the neighborhood has. If there was already a low voltage transformer for 3-phase near by, might have been different.
I was trying to get power for future shop tools, 3-phase appliances like HVAC, and my Sunny TriPower.
But that GT PV inverter was rejected for not having the latest grid support and control features required as of 2020, so I backed off to using Sunny Boy. (will substitute Smart Energy which is replacing the discontinued model.)
I'll just use VFD for any tools.
Considered 3x Sunny Island to make 3-phase from single phase, but I haven't found a way to feed 120/240V to them, only 120V, cutting in half the pass-through current. I did get 3x SI to connect but had excessive current flow (using transformers to do vectors off 120/208Y phases to get 180 degrees phase.)