Sel SEL-351S - Figure 5.6 POTT Logic

5.18
SEL-351S Relay Instruction Manual Date Code 20080103
Trip and Target Logic
Permissive Overreaching Transfer Trip (POTT) Logic
q Figure 4.1; w Figure 5.5; e Table 3.8 ; r Table 3.1 0; t Figure 5.1.
Figure 5.6 POTT Logic
Rising Edge
Detect
ECTT to Trip Logic t EKEY KEY to Trip Logic t Z3RB
Wye-Connected
Voltages
Delta-Connected
Voltages
This entire logic is enabled if setting ECOMM = DCUB1, DCUB2, or POTT
0
EDURD
0
EBLKD
0
Z3RBD
ETDPU
0
Permissive Trip
Weak-Infeed Logic Enabled
WFC
Comm. Scheme Trip Settings
Loss-of-
Potential
SEL
OGIC
Settings
TRCOMM
Setting
ELOP = Y1
LOP
67P3
67N3
67G3
67Q3
3P0
w PT
q
27A1
e 27B1
27C1
59N1
27AB
r 27BC
27CA
59Q
EWFC = Y
Setting
Settings
EBLKD = OFF
ETDPU = OFF
Relay
Word
Bits
Relay
Word
Bits
Three-Pole Open Condition
Weak-Infeed Condition
Relay
Word
Bits