Schweitzer Engineering Laboratories SEL-311C - Figure 3.6 Zones 3 and 4 AB Phase Distance Logic

3.9
Date Code 20060320 Instruction Manual SEL-311C Relay
Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Distance Elements
Note 1: mAB = A-Phase to B-Phase Distance Calculation, ZnP = Zone n Distance Setting, n = 3 for Zone 3, n = 4 for
Zone 4.
Note 2: ABCn and PPn are compensator distance element calculations.
q From Figure 4.14; w from Figure 4.15; e from Figure 3.18; r from Figure 3.23; t from Figure 4.1.
Figure 3.6 Zones 3 and 4 AB Phase Distance Logic
q 32QF
w R32P
(Internal Element)
MABCn
|IAB|
50PPn
(Advanced Setting)
"C" in E21P
(Setting)
t ILOP
|IBC|
|ICA|
See Note 2 ABCn < 0
(Calc)
See Note 2 PPn < 0
(Calc)
MPPn
_
+
_
+
_
+
w F32P
(Internal Element)
DIRn = F
(Setting)
q 32QR
DIRn = F
(Setting)
VPOLV
OSBn
DIRn = F
(Setting)
|IAB|
50PPn
(Advanced Setting)
mAB < ZnP
e OSBn
a2
(Setting)
r 50Qn
VPOLV
|I2|/|I1|
t ILOP
FSB
FSA
_
+
_
+
UBD
0
Relay
Word
Bits
Relay
Word
Bits
MABn
MnP
Zone 3 Phase Distance Logic for
AB Phase Pair. BC and CA Logic Is Similar.
mAB > –ZnP
See
Note 1
MBCn
MCAn
MPPn
MABCn
"C" in E21P
Relay
Word
Bits
(unless
noted)
q 32QF
w F32P
(Internal Element)
q 32QR
w R32P
(Internal Element)
Zone n Compensator Distance Logic