11.38
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Row Lists
Table 11.5 Relay Word Bits: Out-of-Step Elements (Sheet 1 of 2)
Row Name Description
21 X6ABC Impedance inside Zone 6 out-of-step
21 X7ABC Impedance inside Zone 7 out-of-step
21 50ABC Positive-sequence current above 50ABCP threshold
21 UBOSB Unblock out-of-step blocking
21 OSBA A-Phase out-of-step block
21 OSBB B-Phase out-of-step block
21 OSBC C-Phase out-of-step block
21 OSB1 Block Zone 1 during an out-of-step condition
22 OSB2–OSB5 Block Zone 2–5 during an out-of-step condition
22 OSB Out-of-step block
22 OSTI Incoming out-of-step tripping
22 OSTO Outgoing out-of-step tripping
22 OST Out-of-step tripping
23 67QUBF Forward direction supervised output from 50QUBP
23 67QUBR Reverse direction supervised output from 50QUBP
23 OOSDET Out-of-step condition detected
23 * Reserved
23 * Reserved
23 * Reserved
23 * Reserved
23 * Reserved
24 X6T Positive-sequence reactance within Zone 6 reactance blinder
24 R6T Positive-sequence resistance within Zone 6 resistance blinder
24 RR6 Positive-sequence resistance within Zone 6 right resistance blinder
24 RL6 Positive-sequence resistance within Zone 6 left resistance blinder
24 X7T Positive-sequence reactance within Zone 7 reactance blinder
24 R7T Positive-sequence resistance within Zone 7 resistance blinder
24 RR7 Positive-sequence resistance within Zone 7 right resistance blinder
24 RL7 Positive-sequence resistance within Zone 7 left resistance blinder
25 DOSB Dependable out-of-step blocking asserted
25 * Reserved
25 * Reserved
25 SSD Out-of-step swing signature detected
25 * Reserved
25 SD Swing center voltage slope detected
25 * Reserved
25 R1T Positive-sequence resistance within Zone 7 left resistance blinder
26 LG_DPFA Lagging A-Phase displacement power factor
26 LG_DPFB Lagging B-Phase displacement power factor
26 LG_DPFC Lagging C-Phase displacement power factor
26 LG_DPF3 Lagging three-phase displacement power factor
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