Name Values (Range) Unit Step Default DescriptionkLdRFw 0.50 - 0.90 Mult 0.01 0.75 Multiplication factor for inner resistive loadboundary, forwardkLdRRv 0.50 - 0.90 Mult 0.01 0.75 Multiplication factor for inner resistive loadboundary, reverseIMinOpPE 5 - 30 %IB 1 10 Minimum operate current in % of IBaseTable 53:ZMRPSB (68) Group settings (advanced)Name Values (Range) Unit Step Default DescriptiontP1 0.000 - 60.000 s 0.001 0.045 Timer for detection of initial power swingtP2 0.000 - 60.000 s 0.001 0.015 Timer for detection of subsequent powerswingstW 0.000 - 60.000 s 0.001 0.250 Waiting timer for activation of tP2 timertH 0.000 - 60.000 s 0.001 0.500 Timer for holding power swing PICKUP outputtR1 0.000 - 60.000 s 0.001 0.300 Timer giving delay to inhibit by the residualcurrenttR2 0.000 - 60.000 s 0.001 2.000 Timer giving delay to inhibit at very slow swingTable 54:ZMRPSB (68) Non group settings (basic)Name Values (Range) Unit Step Default DescriptionGlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Valuegroups7.1.6 Operation principlePower swing detection (ZMRPSB ,68) function comprises an inner and an outerquadrilateral measurement characteristic with load encroachment, as shown in figure 62.Its principle of operation is based on the measurement of the time it takes for a powerswing transient impedance to pass through the impedance area between the outer and theinner characteristics. Power swings are identified by transition times longer than atransition time set on corresponding timers. The impedance measuring principle is thesame as that used for the distance protection zones. The impedance and the characteristicpassing times are measured in all three phases separately.1MRK 502 048-UUS A Section 7Impedance protection153Technical manual
