3 Phase 120VAC to 1 Phase 230VAC - PLCS.net

gibson · July 28th, 2013, 11:59 PM

How do i make this conversion ? shall i use a Transformer ?

iant · July 29th, 2013, 01:02 AM

transformrs rely on turns ratio's ONLY
Be aware of the load here
you use a STEP UP transformer on one of the phases
formula = 120/230 = 1:2 or (0.5217:1) turns ratio
remember any current on the secondary side of the Transformer is multiplied by the turns ratio on the primary side.
this is Single Phase to Single Phase

but 230 v Ac might be 50 Hz not 60 as is the case with 120vac supplies
(this might effect the device if you are not aware of it)

jvdcande · July 29th, 2013, 01:05 AM

Quote:

Originally Posted by gibson

How do i make this conversion ? shall i use a Transformer ?

Yes.

The next question is what kind of transformer. (edit: and since Ian beat me to it, he already has given the answer and some other things to think about)

balash · July 29th, 2013, 01:31 AM

what about using rectifier and inverter?

iant · July 29th, 2013, 01:34 AM

as Jean Pierre said
I should have answered Yes

so Yes
if you want to build one
sso design it - it is your task for the day.

jvdcande · July 29th, 2013, 01:57 AM

Quote:

Originally Posted by gibson

How do i make this conversion ? shall i use a Transformer ?

Maybe not.

How is the three phase network configured?

@iant: there's nothing wrong with confusing somebody a little bit. It might make them think, at least I hope so.

iant · July 29th, 2013, 02:06 AM

yep I coulnt help myself

iant · July 29th, 2013, 02:11 AM

I forgot to mention
after you have built the Inverter
make sure that Microwaves will work with pulsed square wave generation

iant · July 29th, 2013, 02:12 AM

I suppose you could run a 3 phase motor generator
3 Phase 120v to 1 Phase 230v
that might work

jvdcande · July 29th, 2013, 03:44 AM

Ian,

in the past we've used that method to generate 3-phase 400V 60hz out of 3-phase 380V 50Hz. You only have to choose the right setup.

Another option is to buy (or rent) an emergency generator set with the right specs.

Kind regards,

iant · July 29th, 2013, 04:45 AM

380 V 3 phase 50 HZ
which country uses that? China?

jvdcande · July 29th, 2013, 05:26 AM

Quote:

Originally Posted by iant

380 V 3 phase 50 HZ
which country uses that? China?

Belgium at that time, and almost all European countries except the UK. Single phase was 220V.

We had to construct and test machinery for the far-east market and so needed a 3-phase 400V 60Hz supply.

Nowadays we use 3-phase 415V 50Hz and 240V single phase.

Kind regards,

OZEE · July 29th, 2013, 08:25 AM

I'm more confused by the 3-phase 120...

iant · July 29th, 2013, 08:42 AM

Quote:

Originally Posted by OZEE

I'm more confused by the 3-phase 120...

AND?

keithkyll · July 29th, 2013, 08:42 AM

The voltage in India is 380/230, 50 Hz. When someone says 3 phase 120, I assume they mean 208/120.
gibson, what are you trying to do? Do you have a machine from the US you are trying to run?

July 28th, 2013, 11:59 PM	#1
gibson Member Join Date: Sep 2012 Location: mumbai Posts: 46	3 Phase 120VAC to 1 Phase 230VAC How do i make this conversion ? shall i use a Transformer ?

July 29th, 2013, 01:02 AM	#2
iant Lifetime Supporting Member + Moderator Join Date: May 2002 Location: Melbourne Posts: 3,663	transformrs rely on turns ratio's ONLY Be aware of the load here you use a STEP UP transformer on one of the phases formula = 120/230 = 1:2 or (0.5217:1) turns ratio remember any current on the secondary side of the Transformer is multiplied by the turns ratio on the primary side. this is Single Phase to Single Phase but 230 v Ac might be 50 Hz not 60 as is the case with 120vac supplies (this might effect the device if you are not aware of it) __________________ Give all the answers - People seldom learn. Guide People to the posibilities - Their Answers will come easily. - Their Knowledge will grow. They will then teach others Regards Ian Trost

July 29th, 2013, 01:34 AM	#5
iant Lifetime Supporting Member + Moderator Join Date: May 2002 Location: Melbourne Posts: 3,663	as Jean Pierre said I should have answered Yes so Yes if you want to build one sso design it - it is your task for the day. __________________ Give all the answers - People seldom learn. Guide People to the posibilities - Their Answers will come easily. - Their Knowledge will grow. They will then teach others Regards Ian Trost

July 29th, 2013, 02:06 AM	#7
iant Lifetime Supporting Member + Moderator Join Date: May 2002 Location: Melbourne Posts: 3,663	yep I coulnt help myself __________________ Give all the answers - People seldom learn. Guide People to the posibilities - Their Answers will come easily. - Their Knowledge will grow. They will then teach others Regards Ian Trost

July 29th, 2013, 02:11 AM	#8
iant Lifetime Supporting Member + Moderator Join Date: May 2002 Location: Melbourne Posts: 3,663	I forgot to mention after you have built the Inverter make sure that Microwaves will work with pulsed square wave generation __________________ Give all the answers - People seldom learn. Guide People to the posibilities - Their Answers will come easily. - Their Knowledge will grow. They will then teach others Regards Ian Trost



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July 29th, 2013, 01:31 AM	#4
balash Member Join Date: Dec 2012 Location: Koprivnica, HR Posts: 412	what about using rectifier and inverter?

July 29th, 2013, 02:12 AM	#9
iant Lifetime Supporting Member + Moderator Join Date: May 2002 Location: Melbourne Posts: 3,663	I suppose you could run a 3 phase motor generator 3 Phase 120v to 1 Phase 230v that might work __________________ Give all the answers - People seldom learn. Guide People to the posibilities - Their Answers will come easily. - Their Knowledge will grow. They will then teach others Regards Ian Trost

July 29th, 2013, 03:44 AM	#10
jvdcande Member Join Date: Apr 2002 Location: Menen Posts: 2,178	Ian, in the past we've used that method to generate 3-phase 400V 60hz out of 3-phase 380V 50Hz. You only have to choose the right setup. Another option is to buy (or rent) an emergency generator set with the right specs. Kind regards, __________________ Jean Pierre Vandecandelaere Professional expert industry VDAB Hoofdbestuur Gasthuisstraat 31 - 10e verd B-1000 Brussel Belgium

July 29th, 2013, 04:45 AM	#11
iant Lifetime Supporting Member + Moderator Join Date: May 2002 Location: Melbourne Posts: 3,663	380 V 3 phase 50 HZ which country uses that? China? __________________ Give all the answers - People seldom learn. Guide People to the posibilities - Their Answers will come easily. - Their Knowledge will grow. They will then teach others Regards Ian Trost

July 29th, 2013, 08:25 AM	#13
OZEE Member Join Date: Mar 2006 Location: Kansas Posts: 1,695	I'm more confused by the 3-phase 120... __________________ "I wonder how people did this before the days of PLCs?" If people would take the time to learn how a simple relay control circuit works..... [Helliana]

July 29th, 2013, 08:42 AM	#15
keithkyll Member Join Date: Jul 2005 Location: Heath, TX Posts: 2,020	The voltage in India is 380/230, 50 Hz. When someone says 3 phase 120, I assume they mean 208/120. gibson, what are you trying to do? Do you have a machine from the US you are trying to run?

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