Schweitzer Engineering Laboratories SEL-311C - Figure 3.11 Zone 2 Quadrilateral Ground Distance Logic

3.14
SEL-311C Relay Instruction Manual Date Code 20060320
Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Distance Elements
Note 1: xAG = A-Phase to Ground Reactance Calculation, XG2 = Zone 2 Reactance Setting, rAG = A-Phase to Ground
Resistance Calculation, RG2 = Zone 2 Resistance Setting.
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 3.11 Zone 2 Quadrilateral Ground Distance Logic
|IA|
50L2
(Advanced Setting)
_
+
_
+
|IG|
50GZ2
(Advanced Setting)
xAG < XG2
FSA
Zone 2 A-Phase Quadrilateral Ground Distance Logic.
B- and C-Phase Logic Is Similar.
–RG2 < rAG < RG2
w 32QGE
e 32GF
XGPOL = I2
(Advanced Setting)
XGPOL = IG
(Advanced Setting)
q 32VE
XAG2
See Note 1
Relay
Word
Bits
(unless
noted)
Relay
Word
Bit
r 3PO
t ILOP
VPOLV