kartracer087
Electrical
- Apr 18, 2020
- 62
Hello,
I am wondering if it is possible to connect a circuit like the one I have shown in the attached PDF where the 87T differential current circuit will only compare the current flowing through my TR-1 transformer? Is that what an 1:1 Aux CT would do for me? The issue is that I don't want the relay to think any current flowing to TR-2 is fault current as it is just normal load current flowing out of zone. I only want in-zone fault current to operate the 87T relay and was wondering if using an Aux CT would do this for me to isolate only that part of the tapped circuit for current comparison purposes.
Thanks.
I am wondering if it is possible to connect a circuit like the one I have shown in the attached PDF where the 87T differential current circuit will only compare the current flowing through my TR-1 transformer? Is that what an 1:1 Aux CT would do for me? The issue is that I don't want the relay to think any current flowing to TR-2 is fault current as it is just normal load current flowing out of zone. I only want in-zone fault current to operate the 87T relay and was wondering if using an Aux CT would do this for me to isolate only that part of the tapped circuit for current comparison purposes.
Thanks.
