Iran Nezam Electrical Design Exam

Practice session

A balanced three-phase 400 V commercial HVAC chiller feeder delivers an active power of P = 45 kW at cos(phi) = 0.85 lagging over a route length of 80 meters. The feeder uses 25 mm2 copper conductors (conductivity gamma = 56 m/(ohm*mm2); line reactance neglected). What is the percentage line voltage drop (Delta U%) at full load?

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