Numerical Relays
Numerical Relays
(OP)
Hi Guys,
In Numerical Relay defining star point what does it means
1.From object or towards object whether it influence protection operation.
2.why star point is also done towards protected equipment.
In Numerical Relay defining star point what does it means
1.From object or towards object whether it influence protection operation.
2.why star point is also done towards protected equipment.






RE: Numerical Relays
We had here thread on the topic, but..don't remember when and where.
1. Star point isn't influence on the protection functionality ( except in the differential protection).
2. From this thread, I remember that lot of us use rule of tumb, star point towards protected object.
3. Reason..CT by temselves also in protected zone.
Best Regards.
Slava.
BTW, in newer relays, you can chenge polirity of each set CT's directly in the protection.
RE: Numerical Relays
RE: Numerical Relays
Thanks for your response can u explain in detail so that it will help me