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?
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.
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If we learn from our mistakes I'm getting a great education!
RE: Russian 220 voltage, how many phases?
RE: Russian 220 voltage, how many phases?
RE: Russian 220 voltage, how many phases?
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If we learn from our mistakes I'm getting a great education!
RE: Russian 220 voltage, how many phases?
RE: Russian 220 voltage, how many phases?
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?
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?
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.
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If we learn from our mistakes I'm getting a great education!
RE: Russian 220 voltage, how many phases?
RE: Russian 220 voltage, how many phases?
----------------------------------
If we learn from our mistakes I'm getting a great education!