It is currently Sun Mar 07, 2021 10:21 am



Post new topic Reply to topic Board index » Arc Flash and Electrical Safety » General Discussion
Author Message
ekstra   ara
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?
Top
 Profile Send private message  
Reply with quote  
richxtlc
 Post subject:
PostPosted: Thu Aug 19, 2010 9:21 am 
Sparks Level
User avatar

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.
Top
 Profile Send private message  
Reply with quote  
jghrist
 Post subject:
PostPosted: Thu Aug 19, 2010 1:34 pm 
Arc Level

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.
Top
 Profile Send private message  
Reply with quote  
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.
Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 4 posts ] 

Board index » Arc Flash and Electrical Safety » General Discussion

All times are UTC - 7 hours


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
© 2019 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883