some examples how this parameter influence the calculation rate for the extractedphasor:• when OverLap=0% the new phasor value is calculated only once perFilterLength• when OverLap=50% the new phasor value is calculated two times perFilterLength• when OverLap=75% the new phasor value is calculated four times perFilterLength• when OverLap=90% the new phasor value is calculated ten times perFilterLength12.1.7 Filter calculation exampleIn the following Figure an example from an installation of this filter on a large, 50 Hzturbo generator with a rating in excess of 1000 MVA is presented. In this installationfilter is used to measure the stator sub-synchronous resonance currents. For thisparticular installation the following settings were used for the filter:• SetFrequency= 31.0 Hz• FilterLength= 1.0 s• OverLap = 75%• FreqBandWidth= 0.0 HzIEC13000178-2-en.vsdABCIEC13000178 V3 ENFigure 284: Example of filter calculationSection 12 1MRK502052-UEN BSystem protection and control600Technical manual
