1 to 3 Phase

[Derrick Hughes]

Any resident experts on this
Bought a machine with two 3 phase motors . No 3 here
Is it cheaper just to buy two new single Phase Motors
Or alternatives?
Sorry if it's in the wrong place
My uncle was king of electrics could do anything but sadly no longer here

 

[Timbo]

Any resident experts on this
Bought a machine with two 3 phase motors . No 3 here
Is it cheaper just to buy two new single Phase Motors
Or alternatives?
Sorry if it's in the wrong place
My uncle was king of electrics could do anything but sadly no longer here

If motors aren't silly big, get a VFD.

 

[vantage]

Any resident experts on this
Bought a machine with two 3 phase motors . No 3 here
Is it cheaper just to buy two new single Phase Motors
Or alternatives?
Sorry if it's in the wrong place
My uncle was king of electrics could do anything but sadly no longer here

The network operators are now obliged to put 3 phase in at either no cost or vastly reduced cost. Had an email recently about it . Worth enquiring.

 

[jd6820]

Any resident experts on this
Bought a machine with two 3 phase motors . No 3 here
Is it cheaper just to buy two new single Phase Motors
Or alternatives?
Sorry if it's in the wrong place
My uncle was king of electrics could do anything but sadly no longer here

Depends on horsepower requirements as stated by previous post. You can use VFD on reasonable sized motors. The limit can be the single phase supply, as current demand is high on larger motors and this is supported better by three phase supplies. With two motors you could also run a rotary phase converter off the single phase supply. This is essentially a single phase motor driving a three phase motor/alternator to create three phase output. But you get losses and if the motors are large you could soon be over the incoming supply between 60-100A typically. Another option is a generator, cheap enough to buy an run if no supply on site.

 

[jd6820]

The network operators are now obliged to put 3 phase in at either no cost or vastly reduced cost. Had an email recently about it . Worth enquiring.

Might you have a link? I've just been on to ENWL and been quoted £83,000 for a three phase supply.

 

[vantage]

Might you have a link? I've just been on to ENWL and been quoted £83,000 for a three phase supply.

No , sorry.
The email was from Arla, I’ll try and find it.

 

[vantage]

https://eur01.safelinks.protection.outlook.com/?url=https://www.ofgem.gov.uk/publications/decision-dcp406a-access-scr-changes-cccm&data=05|01|[email protected]|c86faf54bd7b48464fc008db2f93ccfe|f10e34fe89944b52a7da4f7aa9068ca0|0|0|638156084065192359|Unknown|TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=|3000|||&sdata=VsjegroXRLOs6cllw3qLQvZ4P/68BCZuViRLixm/95o=&reserved=0
@jd6820 , not sure if this is any help?

 

[jd6820]

https://eur01.safelinks.protection.outlook.com/?url=https://www.ofgem.gov.uk/publications/decision-dcp406a-access-scr-changes-cccm&data=05|01|[email protected]|c86faf54bd7b48464fc008db2f93ccfe|f10e34fe89944b52a7da4f7aa9068ca0|0|0|638156084065192359|Unknown|TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0=|3000|||&sdata=VsjegroXRLOs6cllw3qLQvZ4P/68BCZuViRLixm/95o=&reserved=0
@jd6820 , not sure if this is any help?

Thank you for the link, it would appear that was released after I made my latest enquiry so I may try again in the near future and see if they can price more competitively.

 

[Wood field]

Depends on the machine ! I run lathes and mills on inverters, wire the controls circuit and keep motor at full speed using the lathe / mill gearbox as normal
Bigger motors, either change motor or look at a phase converter, but good ones don’t come cheap

 

[Derrick Hughes]

I could have a problem
It seems the main motor is 15 kw now way will my supply drive that
Generator Job ?

 

[NH 200]

If you want some good advice phone Motor control warehouse in Newtown and ask for Gareth Lloyd. He can advise if the motors you have can work on a Invertek inverter, 1st class service.

 

[jd6820]

I could have a problem
It seems the main motor is 15 kw now way will my supply drive that
Generator Job ?

Probably be a struggle. Assuming peak efficiency of 100% which in a motor isn't possible, at full load that motor will draw at least 62 Amps, added to the fact that the startup current could easily exceed 150 Amps, I'd say with all the lights and other power draws switched off you may just about be able to start/run the motor on a standard supply but you'd be able to use nothing else at the same time. So I'd say a generator would be your best bet.

 

[Exfarmer]

Probably be a struggle. Assuming peak efficiency of 100% which in a motor isn't possible, at full load that motor will draw at least 62 Amps, added to the fact that the startup current could easily exceed 150 Amps, I'd say with all the lights and other power draws switched off you may just about be able to start/run the motor on a standard supply but you'd be able to use nothing else at the same time. So I'd say a generator would be your best bet.

or put a PTO on if possible

 

[Derrick Hughes]

Ok next question for you helpfull people
Two motors amount to aproxx 20 kw

How big a KV Genarator will I need to start and run it ?
Biggest motor is 15 kw

 

[upnortheast]

30kva min ?

 

[Exfarmer]

you can get different types of starter to assist. I s it a Star Delta ?
I know we used to have a mill many years ago had a large motor with something like this.
Suspect there are modern versions

 

[Bury the Trash]

How bout a PTO 3 phase genny?

 

[Universe]

Depends on a lot of things, should think 40-50Kva.
Star/star delta/inverter/soft start? starting separately or together, how many starts over how long, power factor, etc

 

[Highland Mule]

I’d be speaking to @grainboy about this one..

Large generator

I’m exploring the installation of 3 phase into our yard due to an increase in power requirement, largely for a drier and associated plant. My alternative is a generator, which I believe could be the most cost effective. What makes and suppliers of generators of this size do you have experience...

thefarmingforum.co.uk

 

[Blue.]

Might you have a link? I've just been on to ENWL and been quoted £83,000 for a three phase supply.

I've just put a 50kva 3ph supply in and it cost £19k.