Schweitzer Engineering Laboratories SEL-311C - Figure 3.12 Zones 3 and 4 Quadrilateral Ground Distance Logic

3.15
Date Code 20060320 Instruction Manual SEL-311C Relay
Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Distance Elements
Note 1: xAG = A-Phase to Ground Reactance Calculation, XGn = Zone n Reactance Setting, rAG = A-Phase to Ground
Resistance Calculation; RGn = Zone n Resistance Setting, n = 3 for Zone 3, n = 4 for Zone 4.
q From Figure 4.7; w from Figure 4.6; e from Figure 4.12; r from Figure 5.3; t from Figure 4.1.
Figure 3.12 Zones 3 and 4 Quadrilateral Ground Distance Logic
|IA|
50Ln
(Advanced Setting)
_
+
_
+
|IG|
50GZn
(Advanced Setting)
xAG < XGn
FSA
Zone 3 and 4 A-Phase Quadrilateral Ground Distance Logic.
B- and C-Phase Logic Is Similar.
xAG > –XGn
w 32QGE
e 32GF
XGPOL = I2
(Advanced Setting)
XGPOL = IG
(Advanced Setting)
q 32VE
XAGn
w 32QE
e 32GR
XGPOL = I2
(Advanced Setting)
XGPOL = IG
(Advanced Setting)
q 32VE
–RGn < rAG < RGn
DIRn = F
(Setting)
See
Note 1
Relay
Word
Bits
(unless
noted)
Relay
Word
Bit
r 3PO
t ILOP
VPOLV