![]() Determine the total power dissipated in each case. Three identical coils, each of resistance 10 ohm and inductance 42mH are connected (a) in star and (b) in delta to a 415V, 50 Hz, 3-phase supply. (c) For a star connection, Ip = IL Hence the line current, IL = 8 Aĥ. ![]() (a) For a star connection, VL =√3Vp Hence phase voltage, Vp = VL/√3 (a) the system phase voltage, (b) the phase current and (c) the line current.Ī ‘415 V, 3-phase supply’ means that 415 V is the line voltage, VL Three loads, each of resistance 30, are connected in star to a 415 V, 3-phase supply. ![]() 62kW Hence wattmeter 1 reads 10.62kW From Equation (1), wattmeter 2 readsĤ. If the two wattmeters indicate P1 and P2 respectively Determine the readings of each wattmeter. Two wattmeters connected to a 3-phase motor indicate the total power input to be 12kW. If the instrument readings are 8kW and 4kW, determine (a) the total power input and (b) the load power factor.ģ. Two wattmeters are connected to measure the input power to a balanced 3-phase load by the two-wattmeter method. If the voltage and current to the motor are 400V and 8.6A respectively, determine the power factor of the system?Ģ. A good way to understand three-phase AC systems is.ġ. ![]() The most common form of polyphase AC power in industry is three-phase, but all polyphase systems share similar traits. “Polyphase” means “many phases,” describing a form of AC electrical system where multiple sinusoidal voltages exist that are not in step with each other. Electrical and electronics - Circuit Theory - Analysing Three Phase Circuits - Solved Problems: Analysing Three Phase Circuits ![]()
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