Schweitzer Engineering Laboratories SEL-421-4 - Table 11.12 Relay Word Bits: Pilot Tripping Elements

11.45
Date Code 20171021 Instruction Manual SEL-421 Relay
Relay Word Bits
Row Lists
Table 11.12 Relay Word Bits: Pilot Tripping Elements (Sheet 1 of 2)
Row Name Description
58 PT Permissive trip received
58 Z3RB Current reversal guard asserted
58 KEY Transmit permissive trip signal
58 EKEY Echo received permissive trip signal
58 ECTT Echo conversion to trip signal
58 27AWI A-Phase undervoltage condition
58 27BWI B-Phase undervoltage condition
58 27CWI C-Phase undervoltage condition
59 WFC Weak infeed condition detected
59 KEY1 Transmit general permissive trip
59 KEY3 Transmit three-phase permissive trip
59 UBB1 Blocks permissive trip Receiver 1
59 PTRX1 Permissive trip received Channel 1
59 UBB2 Blocks permissive trip Receiver 2
59 PTRX2 Permissive trip received Channel 2
59 UBB Block permissive trip received 1 or 2
60 PTRX Permissive trip received Channel 1 and Channel 2
60 Z3XT Current reversal guard timer picked up
60 Z2PGS Zone 2 phase and ground short delay element
60 67QG2S Negative-sequence and residual directional overcurrent short delay element
60 DSTRT Directional start element picked up
60 NSTRT Nondirectional start element picked up
60 STOP Stop element picked up
60 BTX Block extension picked up
61 Z3RBA A-Phase current reversal guard asserted (ECOMM = POTT3)
61 Z3RBB B-Phase current reversal guard asserted (ECOMM = POTT3)
61 Z3RBC C-Phase current reversal guard asserted (ECOMM = POTT3)
61 KEYA Transmit A-Phase permissive trip (ECOMM = POTT3)
61 KEYB Transmit B-Phase permissive trip (ECOMM = POTT3)
61 KEYC Transmit C-Phase permissive trip (ECOMM = POTT3)
61 KEYD Transmit directional permissive trip (ECOMM = POTTZD)
61 * Reserved
62 EKEYA A-Phase echo received permissive trip signal (ECOMM = POTT3)
62 EKEYB B-Phase echo received permissive trip signal (ECOMM = POTT3)
62 EKEYC C-Phase echo received permissive trip signal (ECOMM = POTT3)
62 ECTTA A-Phase echo conversion to trip signal (ECOMM = POTT3)
62 ECTTB B-Phase echo conversion to trip signal (ECOMM = POTT3)
62 ECTTC C-Phase echo conversion to trip signal (ECOMM = POTT3)
62 * Reserved
62 * Reserved
63 PTA A-Phase permissive trip received (ECOMM = POTT3)