P.3.228
SEL-411L Relay Protection Manual Date Code 20151029
Protection Functions
Permissive Overreaching Transfer Tripping Scheme
PTA A-phase permissive trip received (when ECOMM = POTT3) SELOGIC equation NA
PTB B-phase permissive trip received (when ECOMM = POTT3) SEL
OGIC equation NA
PTC C-phase permissive trip received (when ECOMM = POTT3) SEL
OGIC equation NA
EPTDIR Enable directional element permissive trip Y, N N
PTDIR Directional element permissive trip received SELOGIC equation NA
COMZDTC Directional element communications-assisted trip enable SEL
OGIC equation NA
a
Make setting when EWFC := SP.
b
Make setting when EWFC := Y or SP.
Table 3.119 POTT Settings (Sheet 2 of 2)
Setting Description Range Default (5 A)
Table 3.120 POTT Relay Word Bits
Name Description
PT Permission to trip received (ECOMM = POTT or POTT2)
PTA A-phase permissive trip received (ECOMM = POTT3)
PTB B-phase permissive trip received (ECOMM = POTT3)
PTC C-phase permissive trip received (ECOMM = POTT3)
Z3RB Current reversal guard asserted (ECOMM = POTT or POTT2)
Z3RBA A-phase current reversal guard asserted (ECOMM = POTT3)
Z3RBB B-phase current reversal guard asserted (ECOMM = POTT3)
Z3RBC C-phase current reversal guard asserted (ECOMM = POTT3)
KEY Transmit permission to trip (ECOMM = POTT or POTT2)
KEYA Transmit A-phase permissive trip (ECOMM = POTT3)
KEYB Transmit B-phase permissive trip (ECOMM = POTT3)
KEYC Transmit C-phase permissive trip (ECOMM = POTT3)
EKEY Echo received permission to trip (ECOMM = POTT or POTT2)
EKEYA A-phase echo received permissive trip signal (ECOMM = POTT3)
EKEYB B-phase echo received permissive trip signal (ECOMM = POTT3)
EKEYC C-phase echo received permissive trip signal (ECOMM = POTT3)
ECTT Echo conversion to trip (ECOMM = POTT or POTT2)
27AWI A-phase undervoltage condition
27BWI B-phase undervoltage condition
27CWI C-phase undervoltage condition
WFC Weak-infeed detected
KEY1 Transmit permission to single-pole trip
KEY3 Transmit permission to three-pole trip
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