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gauravgauramu
Member

Join Date: Dec 2008
Location: chennai
Posts: 9

Siemens Relay - Transient Dimensioning Factor

12/12/2008 4:13 AM

As we all know that CT transient overdimensioning factor is given as (1+X/R) , for 120 MVA relay value is about 21(20+1) but siemens have given transient overdimensioning (kt) as 4 for transformer differential protection, Pls somebody explain this in details.
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biswanath.das
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Join Date: Oct 2006
Location: Kolkata, India
Posts: 447
#1

Re: Siemens Relay - Transient Dimensioning Factor

12/24/2008 12:24 AM

What's 120MVA relay?

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gauravgauramu
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Join Date: Dec 2008
Location: chennai
Posts: 9
#2
In reply to #1

Re: Siemens Relay - Transient Dimensioning Factor

12/30/2008 1:33 AM

SORRY this is 120MVA transformer
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kapil_jani
Participant

Join Date: Jul 2011
Posts: 3
#3

Re: Siemens Relay - Transient Dimensioning Factor

08/23/2011 3:43 PM

Yes, siemens is giving value 4/5, there is different equation for other relay makes, as a basic equation Vknee=2 Ifs (Rct + 2 Rloop), what is basis of this equation to any standard?,
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