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Anonymous Poster #1

Help with Electrical Diagram

05/02/2013 4:21 AM

Could anyone help me with a diagram, both mains and control, for a closed transition star/delta starter?.

Regards,

Colin Taylor
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Randall
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Location: Hemel Hempstead, UK
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#1

Re: Electrical Design Engineer, UK company

05/02/2013 5:02 AM

Does this help?

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cb-taylor59
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Join Date: Apr 2013
Posts: 3
#2
In reply to #1

Re: Electrical Design Engineer, UK company

05/02/2013 5:27 AM

Randall,

Yes, that does help me.

Thank you for your assistance.

Regards,

Colin Taylor
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V.I.Abraham
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Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

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#5
In reply to #1

Re: Electrical Design Engineer, UK company

05/10/2013 3:11 AM

Avery good link.Real good search result.GA
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

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#3

Re: Help with Electrical Diagram

05/02/2013 10:27 AM

Just out of curiosity, why on earth would you want to go to that trouble, as opposed to spending less and attaining more control by using a solid state soft starter?

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cb-taylor59
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#4
In reply to #3

Re: Help with Electrical Diagram

05/03/2013 3:53 AM

JRaef,

We have an existing installation which starts a motor using an open transition

star/delta starter. On changeover from star to delta we are getting a high current

peak of about 6 times full load current. It is being proposed to change the starter to

closed transition type to reduce the current peak on changeover.

Soft starter is not suitable for this application.

Regards,

C Taylor
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

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Location: California, USA, where the Godless live next door to God.
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#6
In reply to #4

Re: Help with Electrical Diagram

05/10/2013 6:06 PM
  • "Soft starter is not suitable for this application."

What makes you say that? There is NOTHING that the Closed Transition Star-Delta starter is going to give you that you will not get from a soft starter, but there is PLENTY that you will get from the soft starter that you cannot attain with the CTSD.

Number one benefit, not closed transition, how about NO transition!

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cb-taylor59
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Posts: 3
#7
In reply to #6

Re: Help with Electrical Diagram

05/11/2013 10:47 AM

There is a physical limitation on this installation, i.e. it is not possible

to fit a soft starter of the size required for this pump motor in the

area available.

Regards,

C Taylor
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