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Transient Stability in industrial network

  1. Oct 23, 2014 #1
    Hi All
    I have done transient stability simulations on isolated electrical network using ETAP 7.5 software.
    Problem: On buses Faults generators return to stable stade
    But on cable faults, rotor angle is diverged so the system is not stable.
    To be noted that we have 2 SOLAR generators of 5MW, exciter is AC8B and governor is ST70.
    Please can you help me to know what can be the problem!
  2. jcsd
  3. Oct 23, 2014 #2
    As far as I can *decipher* your post this would mean the fault conditions on cable terminals (or somewhere in the network far from generator) gives more difficulty for the generator's rotor to stay in synchronism after the fault. This can happen in various ways if the faults are not cleared in time. But I've never work with that software and don't know about your generators and cables network parameters to be more specific.
  4. Oct 24, 2014 #3
    Thanks zoki85 for your reply.
    Time fault is reduced to 80ms. What I don't understant that when fault applied on Bus loacted at the extremity of the cable or on the begining we have no problem even if time fault increase to 250ms.So I can Conclud that I have no parameter problem on generators. But when fult is appled in the cable at any distance we have the rotor angle unstable. I have tried many types of exciters with different parameters : the same problem.
  5. Oct 24, 2014 #4
    Is there maybe some element (transformer?) between generator's bus terminals and cable terminals?
  6. Oct 24, 2014 #5
    Due to number of elements in the network, I try to isolate the problem by deleting sub systems. I will inform you in few time
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