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In a single line diagram of a power system, "PF" typically stands for Power Factor. It is a measure of how efficiently electrical power is being converted into useful work output and is defined as the ratio of real power (measured in watts) to apparent power (measured in volt-amperes). A power factor of 1 indicates that all the power is being effectively utilized, while lower values indicate inefficient use of power, often due to reactive power in the system.

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