CT's

[RAVWARD]

Hi Everybody,
I am not a protection and coordination guy but I am venturing to this new area and it is an exhaustive field. Could you plz advise me, where on the web I can find a literature section that can give me a better idea about types of CT's and PT's and selection criterion. As for example, where we would use a zero sequence CT and how many cables will run through it and for example can a window type CT can be a zero seq CT. These are just questions that come to my mind. I am starting with IEEE protection and coordination book but its chapter on CT and PT talks about the characteristics and not the types. A piece of advise for a specific web section would be appreciated.

Thanks

 

[jghrist]

Chapter 6 of the Areva PRAG Network Protection & Automation Guide at ftp://ftp.areva-td.com/NPAG/Chap6-78-97.pdf

Chapters 7&8 of Art & Science of Protective Relaying by C. Russell Mason at

http://www.geindustrial.com/multilin/notes/artsci/art07.pdf

and

http://www.geindustrial.com/multilin/notes/artsci/art08.pdf

 

[davidbeach]

The whole Areva book is a good reference, although it has a definite IEC slant to things (if you're in that part of the world so much the better, if not, well it's a bit weak in ANSI specifics). The standard reference is Blackburn's Protective Relaying: Principles and Applications.

 

[RAVWARD]

Hi Guys,
One more question, How do we decide we have to select NFPA or IEEE for Arc Flash Analysis.

Thanks

 

[davidbeach]

Like so many things, it depends. NFPA 70E has a method of calculating arc flash energy as does IEEE 1584. NFPA 70E recognizes the IEEE 1584 calculations as an acceptable alternate method. I think that most working professionals use the IEEE 1584 calculations over the NFPA 70E calculations, but the level of PPE required comes from NFPA 70E.

 

[RAVWARD]

Hi Everybody,

Thanks for the earlier responses. I have a quick question, how we can decide as per on the application basis that it needs a splicing arrangement for connecting two cables or a cable coupler. Just wanted to find out, how some body can choose from either one of them.
Thanks