×
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

Motor Starting Current and Transformer Voltage Drop

Motor Starting Current and Transformer Voltage Drop

Motor Starting Current and Transformer Voltage Drop

(OP)
When we start a large motor it is having a large starting current which loads the transformer causing the voltage drop.

If I keep this starting Motor MVA lower than the Transformer Short Circuit MVA. Can it be of any help in controlling  the Voltage drops?

Thanks
ITE

RE: Motor Starting Current and Transformer Voltage Drop

(OP)
Thanks rbulsara

RE: Motor Starting Current and Transformer Voltage Drop

You still need to do the calcs. Lowering of starting kVA will help but how much? That depends on the details.

Rafiq Bulsara
http://www.srengineersct.com

RE: Motor Starting Current and Transformer Voltage Drop

I have to start motors Direct on line.How can i keep the starting motor MVA lower than the Transformer s.c MVA.
Because of DOL i think, i must change transformer ratings.

RE: Motor Starting Current and Transformer Voltage Drop

Keeping motor starting MVA below transformer SC MVA is no guarantee of acceptable voltage dip. As indicated before do some calculations or have someone do it for you.

Rafiq Bulsara
http://www.srengineersct.com

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