P.16.8
SEL-411L Relay Protection Manual Date Code 20151029
Relay Word Bits
Alphabetic
87CH2TK Time is OK at both relays of Channel 2 408
87CH2TS Channel 2 time-based synchronization 409
87CH3AC Channel 3 is active 120
87CH3AL Alarm asserted for Channel 3 114
87CH3BR Temporary channel breaker detected in Channel 3 114
87CH3CH Channel 3 precise clock calculations 407
87CH3CL Channel 3 coarse clock calculations 407
87CH3CS Channel 3 channel-based synchronization 409
87CH3DT Step change in the round trip alarm for Channel 3 99
87CH3FB Channel 3 time fallback mode 411
87CH3FC Channel 3 forced to channel-based synchronization 408
87CH3FO Channel 3 forced out 405
87CH3FT Channel 3 force time-based synchronization 408
87CH3HS Channel 3 high-synchronization quality 410
87CH3LP Lost packet alarm for Channel 3 113
87CH3LS Channel 3 low-synchronization quality 411
87CH3NB Noise burst detected in Channel 3 114
87CH3NS Channel 3 no synchronization 409
87CH3OK Communication on channel 3 is OK 98
87CH3RQ Channel 3 is required 120
87CH3T Maximum channel delay alarm for Channel 3 99
87CH3TK Time is OK at both relays of Channel 3 408
87CH3TS Channel 3 time-based synchronization 409
87CHTRG Trigger bit for 87L recording 116
87CTWL Terminal W included in 87L element 97
87CTXL Terminal X included in 87L element 97
87DD Disturbance detected (local and remote) 95
87DDIL Disturbance detected in local 87L currents 404
87DDL Disturbance detected in local 87L currents or LINEV voltages 97
87DDR Disturbance detected in remote currents 97
87DDRD Incremental change detected in remote currents 404
87DDVL Disturbance detected in local 87L voltages 404
87DTT1–87DTT3 87L Direct Transfer Trip received from Remote Terminal 1–3 115
87DTTI Differential Element Distributed Trip Initiated 116
87DTTRX 87L Direct Transfer Trip received and validated 94
87EFD External fault detected in a vicinity of the protected line 96
87EFDL External fault detected at the local terminal 96
87EFDR External fault detected by one of the remote terminals 96
87ERR1 87L watchdog Stage 1 operation 119
87ERR2 87L watchdog Stage 2 operation 119
87FIDEN 87FIDEN logic enabled 49
Table 16.1 Alphabetical List of Relay Word Bits (Sheet 8 of 39)
Name Bit Description Row
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