9.2.1.8. Circuit breaker failure protection (50BF/52BF) CBFP
Table. 9.2.1.8. - 286. Breaker failure (50BF/52BF) technical data
Input signals
Input magnitudes
Phase currents, I01, I02 I0Calc fundamental freq RMS
Digital input status, Digital output status
Pick-up
Pick-up current setting
-IL1…IL3
-I01, I02, I0Calc
0.10…40.00 x In, setting step 0.01 x In
0.005…40.00 x In, setting step 0.005 x In
Inaccuracy
-Starting phase current (5A)
-Starting I01 (1 A)
-Starting I02 (0.2 A)
-Starting I0Calc (5 A)
±0.5 %I
SET
or ±15 mA (0.10…4.0 x I
SET
)
±0.5 %I0
SET
or ±3 mA (0.005…10.0 x I
SET
)
±1.5 %I0
SET
or ±1.0 mA (0.005…25.0 x I
SET
)
±1.0 %I0
SET
or ±15 mA (0.005…4.0 x I
SET
)
Operation time
De nite time function operating time setting
0.050…1800.000 s, setting step 0.005 s
Inaccuracy
-Current criteria (Im/Iset ratio 1.05
→
)
-DO or DI only
±1.0 % or ±55 ms
±15 ms
Reset
Reset ratio
97 % of pick-up current setting
Reset time
<50 ms
9.2.1.9. Restricted earth fault / Cable end differential (87N) Iod>
Table. 9.2.1.9. - 287. Restricted earth fault / Cable end differential (87N) technical data
Input signals
Input magnitudes
Phase currents, I01, I02 fundamental frequency RMS
Calculated bias and residual differential currents
Pick-up
Operating modes
Restricted earth fault
Cable end differential
Characteristics
Biased differential with 3 settable sections and 2 slopes
Pick-up current sensitivity setting
Slope 1
Slope 2
BIAS (Slope 1&2)
0.01…50.00% (In), setting step 0.01 %
0.00…150.00%, setting step 0.01%
0.00…250.00%, setting step 0.01%
0.01…50.00 x In, setting step 0.01
Inaccuracy
- Starting
±3% of set pick-up value > 0.5 x In setting.
±5 mA < 0.5 x In setting
Operation time
Instant operation time
1.05 x Iset
<30ms
Reset
Reset ratio
No hysteresis
Reset time
<40ms
AQ-F255
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
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