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This paper presents the analysis of the equivalent 10-Hz voltage flicker measurement ( Delta V10) based on the IEC flickermeter standard. The Delta V10 method has been employed to evaluate voltage flicker for more than two decades in several Asian countries and not been updated since 1978. Therefore, a careful inspection from various aspects was made against the Delta V10 method. The results uncover the deficiencies in the reliability of the Delta V10 method for voltage flicker measurement.