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Relaying, Protection & Coordination at higher voltages

Relaying, Protection & Coordination at higher voltages

Relaying, Protection & Coordination at higher voltages

(OP)
Good morning folks! First post, hoping to learn lots and in the future contribute!

Something I'm working on requires knowledge of how P&C is done, the approach, the process and the decisions that need to be made. I was reading the IEEE Buff Book(which primarily focuses on industrial and commercial power systems, plant level) but in it it specifically states:

"Industrial power system voltages fall into three categories: above 15 000 V, from 15 000 to 601 V, and below 600 V. The industrial power system usually includes only the distribution busses 15 000 V and below. However, it may include the subtransmission substation bus at a higher voltage level. Bus protective relaying at this level may overload sections of equipment supplied by the electric utility."

The specific area of interest to me is busbar protection at higher voltages (in my case, 49 kV and 230 kV). I was assuming that you'd follow the same principles no lower voltage levels, but the quoted paragraph leads me to believe otherwise.

Can anyone recommend any good resources about P&C within the context of transmission and distribution voltage levels (high voltages)?

Thank you in advance.

RE: Relaying, Protection & Coordination at higher voltages

Bus differential relaying is not load sensitive, and certainly doesn't cause overloading. It will also not prevent overloading. My 2001 version states it a bit differently:
"Bus protective relaying at this level may create a panel space problem in sections of equipment supplied
by the electric utility."

RE: Relaying, Protection & Coordination at higher voltages

Check this:
http://www.areva-td.com/solutions/US_930_US%3A%3ASolutions%3A%3AAutomation%3A%3ANPAG.html

I am not sure if it is free to download now, or something have to be paid, as my hardrcopy is a gift from AREVA (complementary to 700 000 USD order smile)
NRAG is great book for every protection engineer, sometimes even experienced one can find something useful.
 

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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant
 

RE: Relaying, Protection & Coordination at higher voltages

It's still free but you need to register. Areva will send it out on CD upon request, but sadly they have stopped publication of the book which I think is a great mistake.
  

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If we learn from our mistakes I'm getting a great education!
 

RE: Relaying, Protection & Coordination at higher voltages

I am agree with you ScottyUK, but when accontants dictate company policy...

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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant
 

RE: Relaying, Protection & Coordination at higher voltages

good point lz5pl, when accountant dictates..engineers where nowhere to be found and no word to deliberate.
i had my 2004 NPRAG hard copy, it's good stuff for protection relay engineers.  


"..the more, the merrier" Genghis Khan

 

RE: Relaying, Protection & Coordination at higher voltages

I got one of the very last hard copies. The purchasing weasels in my own company wanted me to accept the downloaded version to save £70. I tactfully* pointed out that the power station which paid their wages was making that amount every second and it only did that because the engineers and techs had the knowledge and resources to keep it running. I got my book.

*Tact and diplomacy being one of the classes I skipped at school. wink
  

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If we learn from our mistakes I'm getting a great education!
 

RE: Relaying, Protection & Coordination at higher voltages

Blackburn's Protective Relaying: Principles and Applications is a pretty good book.

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