ABB REF611 - Page 135

X120-BI2
X100 PO2
LED 8
PHIPTOC1_OPERATE
DPHHPDOC1_OPERATE
DPHLPDOC1_OPERATE
DPHLPDOC2_OPERATE
DEFHPDEF1_OPERATE
OR
DEFLPDEF1_OPERATE
DEFLPDEF2_OPERATE
SELGAPC3
OUT_2IN_4
OSWGAPC15
OUTIN_5
LED 4
THERMAL OVERLOAD PROTECTION
CIRCUIT BREAKER FAILURE PROTECTION
SELGAPC4
OUT_8
IN_17
OSWGAPC11
OUT
IN_1
SELGAPC4
OUT_4
IN_13
SELGAPC1
OUT_2IN_2
CB Closed Position
51BF/51NBF(1)
3I
I
0
START
TRRET
TRBU
POSCLOSE
CB_FAULT
BLOCK
CB_FAULT_AL
CCBRBRF1
3I>/I
0
>BF(1)
T1PTTR1
3Ith>F(1)
49F(1)
BLK_OPR
START
OPERATE3I
BLK_CLOSE
ALARMENA_MULT
AMB_TEMP
GUID-7E8B4813-B13B-4372-A1CD-3ACCFAE3E9BF V2 EN
Figure 110: Thermal overload and circuit-breaker failure protection
The thermal overload protection T1PTTR1 provides indication on overload
situations. LED 4 is used for the thermal overload protection alarm indication.
The circuit-breaker failure protection CCBRBRF1 is initiated via the start input by a
number of different protection stages in the protection relay. The circuit-breaker
failure protection function offers different operating modes associated with the circuit
breaker position and the measured phase and residual currents. The breaker failure
protection has two operating outputs: TRRET and TRBU. The TRRET operate output
is used for retripping its own breaker through the Master Trip 2. The TRBU output is
used to give a backup trip to the circuit breaker feeding upstream. For this purpose, the
TRBU operate output signal is connected to the output PO2 (X100:8-9). LED 8 is used
for backup (TRBU) operate indication.
1MRS757456 D Section 3
REF611 standardized configurations
REF611 129
Application Manual