Previous in Forum: Star delta starter: resistor calculation   Next in Forum: what is O-0.3s-CO-3min-CO for a Circuit breaker?
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
4 comments
Rate Comments: Nested
iturrospe
Participant

Join Date: Mar 2008
Posts: 2

Closed transition resistor

03/12/2008 12:47 PM

Could you inform me how I can calculate the resistors (in ohms and watt values) of a Wy starter with closed transiton?

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.
dkwarner
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 6215
Good Answers: 248
#1

Re: Closed transition resistor

03/12/2008 11:52 PM

First, thank you for registering, and welcome to CR4!

You need to give a lot more details. I suspect you are talking about a Wye-connected motor soft starter, but then...

__________________
 Teaching is a great experience, but there is no better teacher than experience.
Register to Reply
iturrospe
Participant

Join Date: Mar 2008
Posts: 2
#2
In reply to #1

Re: Closed transition resistor

03/13/2008 5:40 AM

Yes I am talking about a star delta motor starter. I know the way to calculate the contactors but I don´t know the way to calculate the value of the resistors in order to get a "closed transition".

The motor is 40HP, 1800rpm, 60HZ, 3x220VCA.

If this information is not enough, please, don´t hesitate to consult me.

thank you
Register to Reply
dkwarner
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 6215
Good Answers: 248
#3
In reply to #2

Re: Closed transition resistor

03/13/2008 11:43 AM

That motor size is out of my range of experience, so I can't really help, but hopefully your added data will give someone else who does know, enough information to help.

Dick

__________________
 Teaching is a great experience, but there is no better teacher than experience.
Register to Reply
crm
Power-User
Engineering Fields - Piping Design Engineering - New Member Technical Fields - Architecture - New Member

Join Date: Apr 2006
Location: Bangalore India
Posts: 288
Good Answers: 3
#4

Re: Closed transition resistor

03/14/2008 6:57 AM

you better bug the starter manufacturer they will provide these in puts but you need to drive them mad thats what i have been doing best of luck

crm

__________________
 Run silent run deep
Register to Reply
Register to Reply
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

crm (1); dkwarner (2); iturrospe (1)

Previous in Forum: Star delta starter: resistor calculation   Next in Forum: what is O-0.3s-CO-3min-CO for a Circuit breaker?

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 (58 right now)
Show Members
Advertisement