A2 Metering Data469Motor Management RelayActual Valueshttp://www.GEindustrial.com/multilin6–14 GE MultilinIEEE conventions define vectors in terms of relative angles as shown below:FIGURE 6–2: Flow Direction of Signed Values for Watts and VarsAll phasors calculated by 469 relays are rotating phasors that maintain the correctphase angle relationships with each other at all times.For display purposes, all phasor angles in a given relay are referred to phase Van orVab, depending on the S2 SYSTEM SETUP ZV VOLTAGE SENSING Z VT CONNECTION TYPEsetpoint. If set to “Wye”, the reference quantity is Van; if set to “Open Delta”, thereference quantity is Vab. If neither voltage is available, the relay uses the currentin Phase A as reference.The phase angles are assigned and displayed as positive angles. However, bydesign, the relay will always work with angles in the lagging direction. This isillustrated below.FIGURE 6–3: Phase Angle Measurement ConventionThe EnerVista 469 Setup software follows this convention and displays vectorsaccordingly.The 469 Motor Management Relay works with lagging angles only.806558A1.CDRIaVanPhase RotationVabVcnVbnIcVcaIbVbc469 RelayVoltageCurrentWATTS = PositiveVARS = PositivePF = LagMGSourceLoadF ° LagPER IEEE CONVENTIONSPARAMETERS AS SEENBY THE 469 RELAY806561A2.CDRPositive Angle Direction0°469 Phase Angle Reference315° Lag270° Lag225° Lag180° Lag135° Lag90° Lag45° LagWARNING
