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CT wiring question

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OCPD

Member
Location
Tempe, AZ
I had a question about the CT wiring to the relay shown in the picture. I was wondering is there a reason to show the wiring swapped other than connecting the polarity to the polarity input of the relay.
Capture.JPG
 

Hv&Lv

Senior Member
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Engineer/Technician
That’s it. The 787 doesn’t show that cross that way.
The differential need to be wired that way.
700G? It looks like an SEL drawing.
That swap is where I see most errors in the IOP and IRT values
It’s in all the 87 relays
 
Last edited:

OCPD

Member
Location
Tempe, AZ
That’s it. The 787 doesn’t show that cross that way.
The differential need to be wired that way.
700G? It looks like an SEL drawing.
That swap is where I see most errors in the IOP and IRT values
It’s in all the 87 relays
Yes, 700G
 

Hv&Lv

Senior Member
Location
-
Occupation
Engineer/Technician
Here’s an example of the 787.
The cards are wired the same.
The cross is there also, just drawn differently
4B067687-F683-484A-922E-F07B9AA54B32.jpeg
 
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