6–18 469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 6: ACTUAL VALUES
FIGURE 6–3: Phase Angle Measurement Convention
The EnerVista 469 Setup software follows this convention and displays vectors accordingly.
The 469 Motor Management Relay works with lagging angles only.
The following is a typical presentation of a three-phase system where current lags the
voltage by 30 degrees.
FIGURE 6–4: Current Lagging Voltage by 30° Display
The phasors shown by the relay and the EnerVista 469 Setup software are a clear
representation of the relationship between the system quantities as seen by the relay.
The
ACTUAL VALUES ZV PHASORS page is a useful troubleshooting tool to identify wiring
errors. Use the phasors displayed by the relay and the tables on pages –22 and –25 to
determine if VTs and CTs are on the correct phases and their polarity is correct. Problems
arising from incorrect wiring include:
806561A2.CDR
Positive Angle Direction
0°
469 Phase Angle Reference
315° Lag
270° Lag
225° Lag
180° Lag
135° Lag
90° Lag
45° Lag
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