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Lanticse, Joshua Lloyd U. BSEE 2A 3 Phase AC circuit problems with Solutions 1. The input power to a 3-phase a.c. motor is measured as 5kW. If the voltage and current to the motor are 400V and 8.6A respectively, determine the power factor of the system?
Describe the three-phase source: Describe the three-phase load: Describe the three-phase line: Calculate the voltage at the neutral of the load with respect to the neutral of the source: Calculate the line currents: Calculate the power delivered to the load: Vp :=120 ZA := 80+ j ZB:= 80+ j 80 ZC:=100 j 25⋅⋅−⋅50 ZaA:= 0 ZbB:= 0 ZcC:= 0 IaA :
Three-Phase Network Configurations As for sources, three-phase loads can also be connected in two different configurations. Y-Connected Load. 𝚫𝚫-Connected Load The Y load has a neutral connection, but the Δload does not Currents in a Y-connected load are the line currents we just determined
Real power is power that results in work (or heat dissipation) The phase angle represents the phase difference between the voltage and the current. This is the power factor angle. The angle of the load impedance. Note that the real power is a function of the cosine of the power factor angle.
This course treats the subject of three phase power in detail and in a manner that a reader, well experienced in three phase circuits or otherwise, will find easy to follow. The course considers all of the possible types of three phase circuits - balanced, unbalanced, three wire, four wire, wye and delta circuits.
Take the Three Phase AC Circuits (Electricity and Electronics) worksheet. These questions & answers will help you master the topic!
Key points. What is a three-phase circuit (source, line, load)? Why a balanced three-phase circuit can be analyzed. by an equivalent one-phase circuit? How to get all the unknowns (e.g. line voltage of the load) by the result of one-phase circuit analysis? Why the total instantaneous power of a balanced. three-phase circuit is a constant?
