Definition
A right triangle representing the relationship between real power (P, in MW), reactive power (Q, in MVAR), and apparent power (S, in MVA) in an AC circuit, where S² = P² + Q² and the power factor angle θ satisfies cos(θ) = P/S. The power triangle illustrates why generators and transmission equipment must be sized in MVA to handle both real and reactive flow simultaneously, and why improving power factor (reducing Q for the same P) allows more MW to be served from the same equipment. It also shows that delivering the same real power at lower power factor requires more apparent power and higher current.
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Topic Deck
Electrical Engineering Fundamentals
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Source
FERC Pro Forma OATT / LGIP