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# ee212_5a - EE212 Passive AC Circuits Lecture Notes 5a Click...

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Click to edit Master subtitle style 9/26/10 EE212 Passive AC Circuits Lecture Notes 5a Three Phase Systems 11

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9/26/10 Three Phase Systems 22
9/26/10 Generation: § steady power (1- φ power is fluctuating) § more efficient conversion of mechanical power to electrical power (3 times power with additional armature windings and slightly more torque) Transmission: § More efficient transmission of power (steady power) § less conducting material required to transmit power (delta transmission – no return conductor) § 3- φ transformers are more efficient Bulk power generation and transmission systems are three- phase (3- φ ) systems. Generation and transmission of electrical power are more efficient in 3- φ systems than in 1- φ systems. Three Phase Systems 33

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9/26/10 Instantaneous Power, p(t) = v(t) x i(t) v(t) = Vm sin ϖ t volts i(t) = Im sin( ϖ t-θ) amperes p(t) = Vm sin ϖ t . Im sin( ϖ t- θ) p(t) = cos θ – cos(2 ϖ t-θ) 2 m m I V 2 m m I V i( t) v(t ) 2SinA.SinB = Cos(A-B) - Cos(A+B) 1st term is constant (equal to the
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