What does negative power factor mean?

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A negative power factor occurs when the device (which is normally the load) generates power, which then flows back towards the source, which is normally considered the generator. For example, if an induction motor is used to operate an electric railway locomotive, the power factor will be lagging by less than 90 degrees as the locomotive climbs a hill.

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Author: https://www.quora.com/What-is-a-negative-power-factor-What-are-the-reasons-for-this-Is-there-any-harmful-effect-on-a-small-capacity-gas-engine-for-a-negative-power-factor