1.3 3-PHASE CIRCUITS

 

• 3-phase circuits are common in large scale power generators and delivery systems.

 

• These systems carry 3 phases of voltage, each 120 degrees out of phase, on three separate conductors. If these three wires are connected through a balanced load the sum of currents is zero. Most systems provide a fourth wire as a neutral.

 

 

• As a result loads can be connected in a delta configuration with no neutral.

 

 

 

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