Westinghouse CO Relay Curve

[ProtectionEngineer]

Hi,
Can someone please tell me where I can download Westinghouse Relay CO time curve for CO7, CO8, CO9 and CO11 or any equations?

Thanks.

 

[DougMSOE]

You might be able to find it in the Westinghouse or TECO (Tiwan(sp) Electric Co.) site as well.
However I would suggest that you look in the Basler web site under protective relays (or call your local rep) and look at their solid state relay set up curves. I have found them (W) CO curves there.

 

[DanDel]

Actually, ABB now owns the Westinghouse-type CO relay line. Follow this link:

http://www.abb.com/global/abbzh/abb...lobal/seapr/seapr035.nsf&v=6312A&e=us&m=9F2&c

 

[busbar]

On equations, there is IEEE C37.112-1996 Standard Inverse-Time Characteristic Equations for Overcurrent Relays Abstract

 

[Dopler]

Check this link, there are the curves for CO relays

http://www.abbus.com/abbrelays/pdf/ILsIBs/Cs41/41101u.pdf