7.3.6 Monitored dataTable 68:LEXPDIS Monitored dataName Type Values (Range) Unit DescriptionXOHM REAL - Ohm Reactance in PrimaryOhmsXPERCENT REAL - % Reactance in percent ofZbaseROHM REAL - Ohm Resistance in PrimaryOhmsRPERCENT REAL - % Resistance in percent ofZbase7.3.7 Operation principleThe Loss of excitation (LEXPDIS) protection in the IED measures the apparentpositive sequence impedance seen out from the generator.Measured mode Measured apparent impedanceZposseq posseqposseqUI=EQUATION1771 V1 EN (Equation 39)There are three characteristics in LEXPDIS protection as shown in figure 71.Naimly:• Offset mho circle for Z1• Offset mho circle for Z2• Directional blinderSection 7 1MRK 502 048-UEN AImpedance protection156Technical manual
