I live under a rock.... The Powell 15kV gear we use - we specify dual trip coils on our mains. The emergency trip at the gear is mechanical. We use the 2 trip coils for our relaying, local tripping and remote tripping where required.
So.. in your case your 2nd TC is fail safe, can you used a...
Where I work, our philosophy is to use 2 seperate lockouts.The 63 will hit an '86-63T' and the 87T will hit an 86T. As jghrist stated..At our higer voltages we hit each of the 2 breaker trip coils with seperate 87T relay outputs (SEL 387, moving to 487E)and another relay output hits the 86T...
Hello all,
What kind of soil resistivity test is used to obtain soil resistivity values to be used to design a ground grid for a 138kV substation? I see the 4 point wenner method is used and also lab resistivity testing with the soil sample.
Which method is generally used by utilities or...
SEL claims this course is of theory and calculations. Even the break down of the topics doesn't include SEL products, but I guess when you get there it's different...
UMRPWR recommended it. ScottyUK, I'm in the US. I dont want to go to a class and then it's all marketing for their product....
Has anyone taken the SEL relaying course?? or ABB or any relaying course. I'm interested in learning more about relaying and I'm looking for a course that's really good for someone with NO experience and with the basic pre requites....
Any Advice??
All, thanks for your advice. I've started a collection of relaying books and I'll add those mention above. Any advice for someone interested in this field?
Can anyone please explain long time and short time settings on a digitrip type solid state trip device?
I'm an intern and would like to learn more about power sys protection. Can anyone please recommend a book that explains relaying, fault analysis,... I'm looking for a real good book for a...
