THREE PHASE SYSTEM

At the end of this week, the students are expected to: Define polyphase system Explain the basic differences between single phase and three phase systems Explain phase sequence of a three phase system State the advantages of three phase circuits. POLYPHASE SYSTEM Circuits or system in which the ac sources operate at the same frequency…

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POWER IN A.C CIRCUIT

At the end of this week, the students are expected to: Calculate power in a.c circuits containing: Resistance Inductance Capacitance Combination of the resistance, inductance and capacitance 1.1 POWER IN A.C CIRCUIT 1.1.1 Power in A.C circuit containing Resistance only + Fig 1.1: (a) pure resistive circuit, (b) power wave form. (b) Inspection of the…

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GENERATION OF THREE PHASE E.M.F’s

Three Phase Systems At the end of this week, the students are expected to: Explain how 3-phase e.m.fs are produced  Distinguish between star and delta three-phase system Derive the relationship between line and phase values of voltages and currents in a star and delta connected windings 2.5 GENERATION OF THREE PHASE E.M.F’s      …

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DERIVATION FOR POWER IN A 3-PHASE CIRCUIT (BALANCED AND UNBALANCED)

At the end of this week, the students are expected to: – Derive an expression for power in a three-phase circuit (balanced and unbalanced) – Explain the two wattmeter and single wattmeter methods of measuring three-phase power 2.8 DERIVATION FOR POWER IN A 3-PHASE CIRCUIT (BALANCED AND UNBALANCED) 2.8.1 Power in a 3-Phase circuit (balanced-delta connection)…

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