Schweitzer Engineering Laboratories SEL-311C - Figure 3.10 Zone 1 Quadrilateral Ground Distance Logic

3.13
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, XG1 = Zone 1 Reactance Setting, X1 = Zone 1 Extension u,
rAG = A-Phase to Ground Resistance Calculation, RG1 = Zone 1 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; y from Figure 4.2;
u from Figure 3.10.
Figure 3.10 Zone 1 Quadrilateral Ground Distance Logic
|IA|
50L1
(Setting)
_
+
_
+
|IG|
50GZ1
(Setting)
xAG < XG1 • X1
FSA
r 3PO
t ILOP
VPOLV
Zone 1 A-Phase Quadrilateral Ground Distance Logic.
B- and C-Phase Logic Is Similar.
–RG1 < rAG < RG1
w 32QGE
e 32GF
XGPOL = I2
(Advanced Setting)
XGPOL = IG
(Advanced Setting)
q 32VE
y CVTBL
XAG1
See Note 1
Relay
Word
Bits
(unless
noted)
Relay
Word
Bit