Calculating Settings For Breaker Failure Protection 3-Phase Activation And Output Ccrbrf (50Bf) - ABB REL650 Applications Manual

1MRK 506 334-UUS A
3.1.13
Application manual
1. Set WEI to Echo & Trip
This echoes CR signal as well as trip locally.
2. Set tPickUpWEI to 0.01 s
Shortest duration of CR signal.
3. Set UPP< to lower than the lowest possible phase-to-phase voltage at non-faulted
operation. The setting is done in % of rated phase-to-phase voltage.
Default setting is 70 %.
4. Set UPN< to lower than the lowest possible phase-to-ground voltage at non-faulted
operation. The setting is done in % of rated phase-to-ground voltage.
Default setting is 70 %.
Calculating settings for breaker failure protection 3-phase
activation and output CCRBRF (50BF)
Breaker failure protection 3-phase activation and output (CCRBRF , 50BF) can use either
contact function in the circuit breaker or current measurement to detect correct breaker
function. For line protections the most suitable way is to use current measurement breaker
check.
1. Set GlobalBaseSel to 1
The settings are made in primary values. These values are given in the base settings
in Global base 1.
2. Set FunctionMode to Current
3. Set BuTripMode to 1 out of 4
In the current measurement the three-phase currents out on the line is used. It is also
possible to measure the residual current (analogue input 4). The logics to detect
failure of the circuit breaker can be chosen:
1 out of 3: at least one of the three-phase current shall be larger than the set level to
detect failure to break
1 out of 4: at least one of the three-phase current and the residual current shall be
larger than the set level to detect failure to break
2 out of 4: at least two of the three-phase current and the residual current shall be
larger than the set level to detect failure to break.
As the residual current protection is one of the protection functions to initiate the
breaker failure protection the setting 1 out of 4 is chosen.
4. Set Pickup_PH to 10 % of IBase
Pickup_PH should be set lower than the smallest current to be detected by the
distance protection (I
5. Set Pickup_N to 10 % of IBase
O PP) which is set 20 % of IBase.
Min p
Section 3
REL650 setting examples
81