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POLYPHASE CIRCUITS

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POLYPHASE CIRCUITS

LEARNING GOALS

Three Phase Circuits

Advantages of polyphase circuits

Three Phase Connections

Basic configurations for three phase circuits

Source/Load Connections

Delta-Y connections

Power Relationships

Study power delivered by three phase circuits

Power Factor Correction

Improving power factor for three phase circuits

THREE PHASE CIRCUITS

Delta Source

Vab = | Vab | 0

Vbc = Vab -120

Vca = Vab -240

Wye – Wye System

Delta – Delta System

Delta – Wye System

Theorem

For a balanced three phase circuit the instantaneous power is constant

INSTANTANEOUS POWER

REPLACE IN THE THIRD AND SOLVE FOR R1

SUBTRACT THE FIRST TWO THEN ADD

TO THE THIRD TO GET Ra

POWER FACTOR CORRECTION

Similar to single phase case.

Use capacitors to increase the

power factor

Balanced

load

Low pf

lagging

Keep clear about total/phase

power, line/phase voltages

To use capacitors this value

should be negative

LEARNING EXAMPLE

LEARNING BY DESIGN

Proposed new store

Wire is OK