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Static Transfer Switches

Tags: static, switches, transfer
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May10-04, 03:08 PM
P: 4
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
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