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CT Ratio
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Author:  hastheknack [ Thu Aug 19, 2010 9:16 am ]
Post subject:  CT Ratio

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?

Author:  richxtlc [ Thu Aug 19, 2010 9:21 am ]
Post subject: 

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.

Author:  jghrist [ Thu Aug 19, 2010 1:34 pm ]
Post subject: 

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.

Author:  hastheknack [ Mon Aug 23, 2010 7:05 am ]
Post subject: 

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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