R.A.33
Date Code 20111215 Reference Manual SEL-421 Relay
Relay Word Bits
Row List
Table A.12 Relay Word Bits: Pilot Tripping Elements (Sheet 1 of 2)
Row Name Description
50 PT Permissive trip received
50 Z3RB Current reversal guard asserted
50 KEY Transmit permissive trip signal
50 EKEY Echo received permissive trip signal
50 ECTT Echo conversion to trip signal
50 27AWI A-phase undervoltage condition
50 27BWI B-phase undervoltage condition
50 27CWI C-phase undervoltage condition
51 WFC Weak infeed condition detected
51 KEY1 Transmit general permissive trip
51 KEY3 Transmit three-phase permissive trip
51 UBB1 Blocks permissive trip Receiver 1
51 PTRX1 Permissive trip received Channel 1
51 UBB2 Blocks permissive trip Receiver 2
51 PTRX2 Permissive trip received Channel 2
51 UBB Block permissive trip received 1 or 2
52 PTRX Permissive trip received Channel 1 and Channel 2
52 Z3XT Current reversal guard timer picked up
52 Z2PGS Zone 2 phase and ground short delay element
52 67QG2S Negative-sequence and residual directional overcurrent
short delay element
52 DSTRT Directional start element picked up
52 NSTRT Non-directional start element picked up
52 STOP Stop element picked up
52 BTX Block extension picked up
53 Z3RBA A-Phase Current Reversal Guard asserted
(ECOMM=POTT3)
53 Z3RBB B-Phase Current Reversal Guard asserted
(ECOMM=POTT3)
53 Z3RBC C-Phase Current Reversal Guard asserted
(ECOMM=POTT3)
53 KEYA Transmit A-phase permissive trip (ECOMM=POTT3)
53 KEYB Transmit B-phase permissive trip (ECOMM=POTT3)
53 KEYC Transmit C-phase permissive trip (ECOMM=POTT3)
53 * Reserved
53 * Reserved
54 EKEYA A-phase echo received permissive trip signal
(ECOMM=POTT3)
54 EKEYB B-phase echo received permissive trip signal
(ECOMM=POTT3)
54 EKEYC C-phase echo received permissive trip signal
(ECOMM=POTT3)
54 ECTTA A-phase echo conversion to trip signal
(ECOMM=POTT3)
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