Sel 411L - Figure 3.136 Zone 3, 4, and 5 AB Loop Conventional Quadrilateral Phase Distance Element Logic; Zone Time Delay

P.3.197
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
Zone Time Delay
Figure 3.136 shows the logic of the Zones 3–5 conventional quadrilateral
phase distance element for the AB loop. Fault calculations for BC and CA
faults have similar logics.
Figure 3.136 Zone 3, 4, and 5 AB Loop Conventional Quadrilateral Phase Distance Element Logic
Zone Time Delay
The relay supports two philosophies of zone timing.
➤ Independent timing—the phase and ground-distance elements
drive separate timers for each zone.
➤ Common timing—the phase and ground-distance elements
both drive a common timer.
Independent Zone
Timing
Use Relay Word bits ZnPT (Time-Delayed Zone Phase Distance Protection)
and ZnGT (Time-Delayed Zone Ground Distance Protection) to select
independent zone timing in SEL
OGIC control equation TR (Trip) (n = 1–5).
IABLFM
0.1 • I
NOM
F32P
R32P
DIRn = F
XABn
RABXn
OSBn
67QUBF
67QUBR
FSA
FSB
HSDAGF
HSDBGF
HSDAGR
HSDBGR
ILOP
SPO
MABDF
xABF
XPn
(setting)
—XPn
(setting)
—0.1 • I
NOM
MABDF
Phase Selection
ENX2AB
32QE
VPOLV