Operation Principle - ABB RET650 Technical Manual

1MRK 504 135-UEN A
Name Values (Range)
kLdRFw
kLdRRv
IMinOpPE
Table 52: ZMRPSB Group settings (advanced)
Name Values (Range)
tP1
tP2
tW
tH
tR1
tR2
Table 53: ZMRPSB Non group settings (basic)
Name Values (Range)
GlobalBaseSel
7.1.6
Technical manual
Unit
0.50 - 0.90 Mult
0.50 - 0.90 Mult
5 - 30 %IB
Unit
0.000 - 60.000 s
0.000 - 60.000 s
0.000 - 60.000 s
0.000 - 60.000 s
0.000 - 60.000 s
0.000 - 60.000 s
Unit
1 - 6 -

Operation principle

Power swing detection (ZMRPSB ) function comprises an inner and an outer
quadrilateral measurement characteristic with load encroachment, as shown in
figure 51.
Its principle of operation is based on the measurement of the time it takes for a power
swing transient impedance to pass through the impedance area between the outer and
the inner characteristics. Power swings are identified by transition times longer than
a transition time set on corresponding timers. The impedance measuring principle is
the same as that used for the distance protection zones. The impedance and the
characteristic passing times are measured in all three phases separately.
Step Default
0.01 0.75
0.01 0.75
1 10
Step Default
0.001 0.045
0.001 0.015
0.001 0.250
0.001 0.500
0.001 0.300
0.001 2.000
Step Default
1 1
Section 7
Impedance protection
Description
Multiplication factor for inner resistive load
boundary, forward
Multiplication factor for inner resistive load
boundary, reverse
Minimum operate current in % of IBase
Description
Timer for detection of initial power swing
Timer for detection of subsequent power
swings
Waiting timer for activation of tP2 timer
Timer for holding power swing START
output
Timer giving delay to inhibit by the residual
current
Timer giving delay to inhibit at very slow
swing
Description
Selection of one of the Global Base Value
groups
125