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Point-on-Wave (POW) is a new characteristic of voltage sag which has a significant influence on the sensitivity of some equipment. This paper investigates the Point of Inception (POI) and the Point of Recovery (POR) of the voltage sag signal due to symmetrical and unsymmetrical faults in power systems. The POI of voltage sag could be any point on the wave where the voltage sag starts. On the other...
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