Definition
The frequency-dependent opposition to the flow of alternating current caused by inductance (inductive reactance, XL = 2πfL) or capacitance (capacitive reactance, XC = 1/2πfC), measured in ohms (Ω). Inductive reactance dominates in overhead transmission lines and consumes reactive power (MVAR), while capacitive reactance generates reactive power and is significant in underground cables and series capacitor banks. Unlike resistance, reactance does not dissipate energy as heat but stores and returns it each cycle; it is the primary determinant of a transmission line's power transfer capability and stability limits.
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Topic Deck
Electrical Engineering Fundamentals
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Source
FERC Pro Forma OATT / LGIP