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Thanks, Dave, for your answer. After changing the circuit as you adviced, I got an error message: "Two Cascade Single Phase Mid Tap Transformer" . Do you know if there is anything I did wrong? thanks, James

Thanks a lot, David, for your reply. Yes, I do have single-phase/unbalanced calculation module. In fact, I am using the evaluation version. My problem is that when I start the "Unbalanced/Single Phase Study Setup" dialog window, I cannot find report file name next to "Comprehensive Fault (SC)"...

Can anyone help me with a single phase short-circuit calculation as follows? It's a airport runway ILS job. We need to run single phase from a 250KVA 13.8KV-240/120v transformer to a 25KVA 240v-2400v step-up transformer, then about 4000' #6 single phase wire to 25kva 2400-120-240V step-down...

Thanks, davidbeach and itsmoked. But can I use the table value for 600V cable to calculate impedance of 2.4kv cable?

Dear All, I am new to this forum and I have one question here. During our design for an airport ILS project, I find I need to calculate the voltage drop for a cable between the step-up and step-down transformer. It's about 3,170ft long and is the load is about 12amp at 2400V. My problem is that...