Question: 1.3 Problem 3: System Phases Why do we use three phases in AC power systems? Why don't we use two or four phases? In class,

1.3 Problem 3: System Phases\ Why do we use three phases in AC power systems?\ Why don't we use two or four phases?\ In class, we learned that Arizona has redundant power transmission lines between two substations.\ This is also seen in the sub-transmission system of the IEEE 118 system. Why do power engineers\ design in such a way?

$1.3 Problem 3: System Phases\ Why do we use three$

1.3 Problem 3: System Phases 1. Why do we use three phases in AC power systems? 2. Why don't we use two or four phases? 3. In class, we learned that Arizona has redundant power transmission lines between two substations. This is also seen in the sub-transmission system of the IEEE 118 system. Why do power engineers designin such a way

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