Previous in Forum: Deckwash Fitting   Next in Forum: Inconsistency Rating Voltage of Low Voltage Motor
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
7 comments
Rate Comments: Nested
elect-ok
Power-User

Join Date: Sep 2008
Location: Jakarta, Indonesia
Posts: 104

460-V Motor and 480-V Power Supply

05/08/2009 4:21 AM

Dear all,

can anybody explain why motor rating written 460 Volt, meanwhile power supply is

480 V ?? should we always use tap changer transformer and decrease the voltage of

our power supply ?

thank you
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: 460V Motor supplied by 480 V Power Supply ??

05/08/2009 5:49 AM

(480V-460V)/480V ≈ 4%

This fluctuation is to be expected. Nothing to worry about.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2
In reply to #1

Re: 460V Motor supplied by 480 V Power Supply ??

05/08/2009 8:27 AM

PW's right.

Like Michael Keaton said in Mr. Mom, "220, 221, whatever it takes.
Register to Reply Off Topic (Score 5)
lasam
Active Contributor

Join Date: Apr 2009
Posts: 10
#4
In reply to #1

Re: 460V Motor supplied by 480 V Power Supply ??

05/09/2009 1:01 AM

Good Answer.

-MS
Register to Reply
4
JRaef
Guru
United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#3

Re: 460-V Motor and 480-V Power Supply

05/08/2009 2:45 PM

There are 2 separate voltage "standards" in the US; Distribution Voltage and utilization Voltage (also nown as Equipment Voltage).

208, 240, 480 etc. is the Distribution Voltage, what the power utilities supply.

200, 230, 460 etc. is the Utiliation Voltage for equipment. The reason it is lower is that it allows for some voltage drop from the utility transformer to the motor windings. utilization voltages for motors are typically supposed to be at least +-10%. But that is a North American standard and other countries do not always understand this, especially low cost suppliers, so it is wise to be vigilant of what a manufacturer states. For example, I have seen where some low cost IEC devices are "rated" for 440V, because they are really designed for 400V +- 10% and 400 +10% = 440. But that is 440 + 0%!

__________________
 ** All I every really wanted to be, was... A LUMBERJACK!.**
Register to Reply Good Answer (Score 4)
No more Good Answers. Go to first "Almost" Good Answer
Anonymous Poster
#7
In reply to #3

Re: 460-V Motor and 480-V Power Supply

05/09/2009 10:50 PM

Most excellent good answer on you dude. I am glad to see that there is someone out there that actually has a clue answering these.
Register to Reply
Anonymous Poster
#5

Re: 460-V Motor and 480-V Power Supply

05/09/2009 1:24 AM

motor power supply voltage is mentioned as 460, means its the maximum voltage under fluctuation the motor can operate normally, if percentage fluctuation is not mentioned.

say 10%.fluctuation

if mentioned, than motor can operate within +-10 % fluctuatuation voltage w.r.t 460 volts.

some times its 460v-480v mentioned, means motor can operate efficiently within this range of supply voltage.

now see your supply voltage.

thanks.

V R Rao.
Register to Reply
suresh sharma
Guru

Join Date: Dec 2007
Location: Mumbai, India
Posts: 1983
Good Answers: 25
#6

Re: 460-V Motor and 480-V Power Supply

05/09/2009 7:11 AM

Hi elect-ok,

As per Indian Standards 10% variation in supply is acceptable for design consideration of the motors.

Suresh Sharma

__________________
 "Engineers should not look for jobs but should create jobs for others" by Dr.Radhakrishnan Ex President of India during my college graduation day
Register to Reply
Register to Reply
Have a Different Question?
7 comments

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (2); JRaef (1); lasam (1); lyn (1); PWSlack (1); suresh sharma (1)

Previous in Forum: Deckwash Fitting   Next in Forum: Inconsistency Rating Voltage of Low Voltage Motor

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (48 right now)
Show Members
Advertisement