a) A 380V, 7.5kW electric water pump of power factor 0.8 lagging and efficiency of 85% will be wired by an armoured XLPE insulated copper cable. The circuit will be run on cable tray with three other similar circuits at an ambient temperature of 40℃. MCCB will be used as the overcurrent protective device for the circuit. The estimated length of the circuit for the machine is 50m.   i) Determine the minimum rating of MCCB for the circuit, available MCCB rating are 25A, 30A, 40A, 50A  ii) Determine the minimum cable size of the circuit if the allowable voltage drop of the circuit is 1.5% of the nominal supply voltage?

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Q: The overall efficiency

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A:

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A: It is given that: VB=247 VEg1=Eg2=250 VRa1=Ra2=0.12 ΩRf1=Rf2=100 ΩIL=40 A

HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.