240 volts 1-phase, 3-phase 1-line
240 volts 1-phase, 3-phase 1-line
(OP)
On customer request I have a design for 240 voltsa 1-p,3-p system 1-line with CT connection to provide power for 4 tenents.
Can some one direct me to a link for a typical 1-line to refresh my memory.
I do not do 240 vots system on regular bases.
I need to have 120 v, 240 volt 1-p and 240 v -3p loads. I know a Y-Delta transfor will take care of this but I like to review a typical 1-line for such system
Thank you in advance
Can some one direct me to a link for a typical 1-line to refresh my memory.
I do not do 240 vots system on regular bases.
I need to have 120 v, 240 volt 1-p and 240 v -3p loads. I know a Y-Delta transfor will take care of this but I like to review a typical 1-line for such system
Thank you in advance






RE: 240 volts 1-phase, 3-phase 1-line
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 240 volts 1-phase, 3-phase 1-line
I agree with Bill - many utilities will no longer provide this service.
The spilt between three phase and single phase loads and between 120V and 240V loads is also a factor.
David Castor
www.cvoes.com
RE: 240 volts 1-phase, 3-phase 1-line
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RE: 240 volts 1-phase, 3-phase 1-line
In other areas open delta may be used to power a relatively small three phase load and a large single phase load.
One particular application was a small machine shop in a residential area. There was a 100 KVA single phase transformer serving a couple of blocks of residences as well as the machine shop. There was a teaser transformer of about 25 KVA to supply open delta 240 Volts to the three phase machinery in the machine shop.
Open delta was also used for large residential loads back when large single phase air conditioning units were not available.
I don't think that many new installations are going in but I have seen the remnants of the three phase residential services a few times. As well as the normal 120:240 Volt single phase service there would be a teaser transformer to supply open delta three phase for the air conditioner.
And in agreement with you, I have seen a number of full delta three phase services for factories where the lighting was fed from one of the three transformers in the transformer bank.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 240 volts 1-phase, 3-phase 1-line
If there was no electricity there would be no internet. Good point, don´t you? :D
RE: 240 volts 1-phase, 3-phase 1-line
RE: 240 volts 1-phase, 3-phase 1-line
The utility has a choice.
David Castor
www.cvoes.com
RE: 240 volts 1-phase, 3-phase 1-line
If there was no electricity there would be no internet. Good point, don´t you? :D
RE: 240 volts 1-phase, 3-phase 1-line
At 800 Amps the utility may demand a three phase wye service. It depends. Some utilities will meter up to 400 Amps single phase directly without CTs.
Bill
--------------------
"Why not the best?"
Jimmy Carter