Multilin 469 Motor Management Relay ... - GE Digital Energy

CHAPTER 6: ACTUAL VALUES
FIGURE 6–1: Vector display in EnerVista 469 Setup
IEEE conventions define vectors in terms of relative angles as shown below:
Source
G
M
Load
PER IEEE CONVENTIONS
PARAMETERS AS SEEN
BY THE 469 RELAY
Voltage
WATTS = Positive
VARS = Positive
PF =Lag
Current
469 Relay
Phase Rotation
FIGURE 6–2: Flow Direction of Signed Values for Watts and Vars
806558A1.CDR
All phasors calculated by 469 relays are rotating phasors that maintain the correct phase
angle relationships with each other at all times.
For display purposes, all phasor angles in a given relay are referred to phase Van or Vab,
depending on the S2 SYSTEM SETUP VOLTAGE SENSING VT CONNECTION TYPE settings.
If set to “Wye”, the reference quantity is Van; if set to “Open Delta”, the reference quantity is
Vab. If neither voltage is available, the relay uses the current in Phase A as reference.
The phase angles are assigned and displayed as positive angles. However, by design, the
relay will always work with angles in the lagging direction. This is illustrated below.
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 6–17
Vca
Ib
Vcn
Vbn
Ic
Vbc
Van
Ia
Vab
F° Lag