Convert 120/240 split phase service to 3 phase 208/120 service 120KVA

[synchro]

For the 10-lead, to get three 120/240V outputs at 120 degrees from each other you would connect T3, T1, and T2 to T0. T6, T4, and T5 would not be connected to another winding. The three 240V L-L outputs would be T9-T6, T7-T4, and T8-T5.

 

[Hv&Lv]

For the 10-lead, to get three 120/240V outputs at 120 degrees from each other you would connect T3, T1, and T2 to T0. T6, T4, and T5 would not be connected to another winding. The three 240V L-L outputs would be T9-T6, T7-T4, and T8-T5.

Well I’ll be…

Yes, it’s the back of an envelope…

 

[kwired]

If you are buying a new generator and haven't bought it yet, just order it with an oversized alternator so you get the KW you need when its wired to single phase. The issue with reduced capacity (by 1/3) when in single phase has to do with the alternator windings, internal wiring, and breaker and nothing to do with the engine.

For example I have a couple 70kw gensets that have 120kw alternators on them so they can supply full current when operating in single phase mode.

Well you will only use about 2/3 the capacity so the engine is oversized and as result maybe less efficient than one closer sized to load.

Never mind, later posts addressed this

 

[garbo]

My organization is building a remote hospital in Haiti. The city power service is 120/240 split phase. We can't find a 120/240v split phase 120 KVA generator in Haiti. We are going to install a 208/120v 3 phase generator. We would like to use all three phases on the generator. The city poco cannot up grade the service to 3 phase power.

We would like the facility to be 3 phase. Is there a way to convert the the 120/240 split phase into 3 phase.

In my experience phase converters are used for running a specific piece of equipment. Not powering a whole facility.

https://www.phoenixphaseconverters....p-digital-rotary-phase-converter-gpx100l.html and even this beast is to small.

Does anyone know of a double conversion UPS that can convert split phase to 3 phase?

I retired from a very large hospital and we were never allowed to make even minor changes. They removed a 112 KVA 1 year old transformer that sat unused for maybe 6 months. They would not reuse it until a testing company that did our switchgear maintenance came in and meggered it before energizing it It was only reused to supply normal power to offices. Must be a very small hospital if they do not have three phase power. One problem I can see if you go to 120/208 system is if they have brown outs during very hot days or what ever existing 240 volt motors have problems running below 208 volts. We had to install 208 to 240 volt transformers for some touchy equipment that could not be rewired for the 480 volts we had thru out the hospital. Liked what another poster said about just ordering the correct gen not that good set from the states. We had 16 generators at our 5 millon square foot campus. Most were Cat diesels st 2,000 KW each. Had 4 natural gas Cat gens that only ran at 1200 ROM due to summer peak shaving ( instead of normal 1800 ROM ). Even after a million dollar upgrade to the 4 gens & controls were good. Could not run over 85 to 88% full resistance load bank monthly test to prevent wet stacking. Also gas gens harder to start & regulate voltage. They had to install 3 starters along with 6. 1500 CCA huge batteries to get the pigs on line by the required 10 seconds. Good luck.

 

[tortuga]

For the 10-lead, to get three 120/240V outputs at 120 degrees from each other you would connect T3, T1, and T2 to T0. T6, T4, and T5 would not be connected to another winding. The three 240V L-L outputs would be T9-T6, T7-T4, and T8-T5.

Nice!

 

[kwired]

I retired from a very large hospital and we were never allowed to make even minor changes. They removed a 112 KVA 1 year old transformer that sat unused for maybe 6 months. They would not reuse it until a testing company that did our switchgear maintenance came in and meggered it before energizing it It was only reused to supply normal power to offices. Must be a very small hospital if they do not have three phase power. One problem I can see if you go to 120/208 system is if they have brown outs during very hot days or what ever existing 240 volt motors have problems running below 208 volts. We had to install 208 to 240 volt transformers for some touchy equipment that could not be rewired for the 480 volts we had thru out the hospital. Liked what another poster said about just ordering the correct gen not that good set from the states. We had 16 generators at our 5 millon square foot campus. Most were Cat diesels st 2,000 KW each. Had 4 natural gas Cat gens that only ran at 1200 ROM due to summer peak shaving ( instead of normal 1800 ROM ). Even after a million dollar upgrade to the 4 gens & controls were good. Could not run over 85 to 88% full resistance load bank monthly test to prevent wet stacking. Also gas gens harder to start & regulate voltage. They had to install 3 starters along with 6. 1500 CCA huge batteries to get the pigs on line by the required 10 seconds. Good luck.

did you miss that it was a remote hospital and in Haiti?