Geographic generalization of limited voltage sag monitoring data

This paper describes a methodology to estimate the annual number of sags to be expected at a low voltage grid connection point, when only sag characteristics of high and medium voltage substations are known. First, the paper describes an algorithm to calculate the sag characteristics at a low voltage busbar from RMS measurements of the feeding medium and high voltage grid. Subsequently, the paper uses a statistical approach to estimate sag statistics at a randomly chosen low voltage connection point by using the sag information from other low voltage grid connection points at which sag meters are installed.