×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Russian 220 voltage, how many phases?

Russian 220 voltage, how many phases?

Russian 220 voltage, how many phases?

(OP)
I need to purchase metering pumps for a plant in St. Petersburg, Russia.  One quote listed the motor as 220 V, single phase, while another had 220V, three phases?  Which should it be?

RE: Russian 220 voltage, how many phases?

Shouldn't you be the one telling the supplier what you want? Ring the plant and ask them what they need. Or if it isn't yet built, ask the designers.

Generally 3-phase motors are more reliable than 1-phase types so if you have 220V single phase then you likely also have 380V 3-phase, and the latter would be a sensible choice.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Russian 220 voltage, how many phases?

(OP)
Thanks for your reply.  I really did not think this through before posting the question.  I am the designer of this plant, which is a new plant at an existing site.  380 V, 3 phase, 50 Hz comes into this site now, but we need to add more power, and a new motor control center is needed.  The larger motors will be 380 V, 3 phase, but these three metering pumps are small.  The lowest bids I have are 220 V, 3 phase if manual but 220 V, single phase if electronically controlled.  My plan is two pumps electronically controlled and one manual.   

RE: Russian 220 voltage, how many phases?

If you have 380V 3-phase, you get 230V single phase for free, but 230V 3-phase costs you a transformer, a d perhaps a non-standard transformer to boot.  

RE: Russian 220 voltage, how many phases?

Just check if the 220V 3-phase motor is delta connected because very often it could easily be changed to 380V star connected by a simple change of links at the terminal box, unless it's been deliberately designed to prevent this.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Russian 220 voltage, how many phases?

(OP)
Thanks for the good advice.  This has been very helpful.  What seems clear is that we should have all three metering pumps electronically controlled, and thus all will be 220 V, single phase.

RE: Russian 220 voltage, how many phases?

There is no good reason whatever to use 1 phase 220V motors if you have acces to 3 phase 380 V.

The 3 phase motors are cheaper and more reliable, many small motors running 1 phase is really 3 phase motors with a capacitor to provide the turning field, these motors have a much lower torque than a 3 phase motor.

RE: Russian 220 voltage, how many phases?

"but these three metering pumps are small" - Nitzey - Just how small are these pumps motors? our electrical engineers always told us that 3/4 HP and above, we should use 3 phase, 1/2 HP and below, use single phase.

Scott,

"very often it could easily be changed to 380V star connected by a simple change of links at the terminal box"

I was once told that changing a motor wiring in the field will result into losing your UL listing.

RE: Russian 220 voltage, how many phases?

cry22,

I honestly don't know - UL is just an interesting curiosity where I work. Our motors are designed so a voltage change requires a simple change of links in the temrinal box. UL must be a total pain in the ass if they object to something as simple as that.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Russian 220 voltage, how many phases?

If it is listed as a multi-voltage motor there would no UL issues using either voltage per the manufacturer's instructions.  If it were a motor theoretically capable of two voltages, but only listed for one and no instructions for changing voltages, then there be a voiding of the listing if you tear it apart and reconnect for another voltage.

RE: Russian 220 voltage, how many phases?

Thanks David.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources