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  1. Los123

    Resonant Calculations Hand / EMTP - Please Help.

    I have a Question. It is about resonant condition(s). Is it possible to do quick calculation to see if resonance is the problem, or do I have to run EMTP? My case: New feeder, 138 kV to 27 kV, energized (from 138kV) for the first time - tripped upon being energized. The cause of the trip was a...
  2. Los123

    Ring Bus - Short Circuit Values - Please Help

    Thank you all ! Last question: What would you recommend as a good reference book for a new transmission engineer ? Thanks
  3. Los123

    Ring Bus - Short Circuit Values - Please Help

    to rcwilson. A little bit more info about my problem: Using Aspen One liner I fault the bus itself, and not the adjacent feeders. I get 41 kA which is 1 kA more then my lowest breaker rating (40 kA). I thought that all breakers would be subject to the same duty. However I was told that they...
  4. Los123

    Ring Bus - Short Circuit Values - Please Help

    I need Help. Using ASPEN One Liner I found the 3-phase, 2-phase and 1-phase short circuit values for each bus in my system. However, my real system is build on ring buses. The question is how can I calculate each breaker (in the ring bus) fault duty. I think this is called IBA (individual...

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