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Static Transfer Switches

  1. May 10, 2004 #1
    I have two UPSs, UPSA & UPSB, and two static transfer switches, STSA & STSB. UPSA feeds Source1 on STSA (preferred) and Source1 on STSB. UPSB feeds Source2 on STSA and Source2 on STSB (preferred). Each UPS has approxiamately a balanced 15KW load. Each UPS has 4 downstream transformers.

    Question: IF i fail source1 on UPSA, STSA will will transfer from source1 to source2. BUT UPSB's inverter will fault on over current. The same thing will happen if i fail the preferred source of UPSB. This problem is also intermittent on both UPSs

    There is more info but i would like to see what questions are generated so i will hold off. This is the core problem.

    Any ideas
  2. jcsd
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