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Correct Method for calculatiing Protection Relay settings

Correct Method for calculatiing Protection Relay settings

Correct Method for calculatiing Protection Relay settings

(OP)
What is the correct method for calculating protection relay setting for Overcurrent & Earth Fault relay.
This relay will protect a 11kV feeder, supplying
a 11kV/433V,2.0MVA transformer.

RE: Correct Method for calculatiing Protection Relay settings

That's a pretty broad question.  What you need to do is do a short circuit study.  Then you can look at the fault currents and see where the relay has to be set so that the cable and transformer damage curves aren't exceeded.  You also have to look at coordination with other protective devices such as fuses, circuit breakers, etc.

RE: Correct Method for calculatiing Protection Relay settings

The best ways I've found (over the years) are to:

1.  Attend classes offered by: Schweitzer Engineering Labs
    and/or Cooper Power Systems.  You will have to attend
    these (week long) classes at their facilities.
    This is the best way.  Hotel, meals, and travel
    expenses are extra.

2.  Purchase one of several books, mostly written by
    Blackburn, most notebly: "Applied Protective Relaying"
    which can be obtained from:  ABB Power T&D
                                 1021 Main Campus Drive
                                 Raleigh, NC  27606
                                 voice: (919)856-3806
                                 1992 cost: $85.00
   
    Blackburn wrote a more recent book (prior to his demise
    in 1997) which I think is the best.  It has many
    examples, and is much simpler than the former.
    You can purhase this book from Amazon.  I think the book
    is entitled "Principles of Protective Relaying".  
    Cost: $90.00

3.  Download the .PDF files of the GE manual "The Art
    and Science of Protective Relaying" by Mason.  One of  
    the other threads in this forum had the download link.

As a prequisite, you should thoroughly understand Symmetrical Components as well as basic power system fault analysis.  


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