yellowsnow
Member
Could someone help on the correct formulas?1. Calculate the line voltage (phase to phase) at the terminals of a 100kW compressor on a 60Hz, 480V, three-phase feeder. The measured power factor of the load is 0.85 lagging, the one-way circuit length is 350ft, and the feeder uses 2/0 copper conductors (R = 0.0967Ω per 1000 feet) rated for 75?C operation installed in EMT conduit.
2. A feeder supplies three-phase power to a 480V transformer. The transformer steps the voltage down to 208/120V to a lighting panel with a continuous load of 45 amps on each phase. What is the required transformer kVA capacity? What is the minimum amperage rating on the primary and secondary conductors?
