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hastheknack
 Post subject: CT Ratio
PostPosted: Thu Aug 19, 2010 9:16 am 

Joined: Fri Jan 08, 2010 5:55 am
Posts: 8
Location: NH
What does the following CT ratio feeding an 87T Differential Relay mean?
600/100-5

Do I use the 600 or the 100 as the primary ratio?
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richxtlc
 Post subject:
PostPosted: Thu Aug 19, 2010 9:21 am 
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Joined: Mon Nov 23, 2009 6:37 am
Posts: 51
Location: Tampa, FL
hastheknack wrote:
What does the following CT ratio feeding an 87T Differential Relay mean?
600/100-5

Do I use the 600 or the 100 as the primary ratio?


How many leads are coming out of the secondary? It may be a multi-ratio CT. MR 600/5 conn 100/5.
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jghrist
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PostPosted: Thu Aug 19, 2010 1:34 pm 
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Joined: Wed Jun 04, 2008 9:17 am
Posts: 428
Location: Spartanburg, South Carolina
richxtlc wrote:
How many leads are coming out of the secondary? It may be a multi-ratio CT. MR 600/5 conn 100/5.


This is generally what the underlining means.
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hastheknack
 Post subject:
PostPosted: Mon Aug 23, 2010 7:05 am 

Joined: Fri Jan 08, 2010 5:55 am
Posts: 8
Location: NH
Thanks guys for the info. After some digging I found that it was a Multi-Ratio (MR) CT with the 100 lead selected.
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