ABB RELION 615 Series Applications Manual page 114

Section 3
REG615 standard configurations
108
DEFHPDEF1_OPERATE
DEFLPDEF2_OPERATE
DEFLPDEF1_OPERATE
EFHPTOC1_OPERATE
GUID-675CC226-1A1F-4706-B718-9E94A3D9CD1A V2 EN
Figure 142: Earth-fault protection function
Three-phase thermal overload protection, two time constants, T2PTTR1 detects
continuous overloading conditions preventing excessive insulation damage in the
long run.
BLOCK
AMB_TEMP
GUID-520542E6-D29F-4B15-92ED-D81AA8886898 V2 EN
Figure 143: Thermal overcurrent protection function
The stabilized and instantaneous differential protection for machines MPDIF1
provides protection against internal failures. The relay compares the phase currents on
both sides of the generator to be protected. If the differential current of the phase
currents in one of the phases exceed the setting of the stabilized operation
characteristic or the instantaneous protection stage of the function, the function
provides an operating signal. The operating signal is connected to the master trip 1 and
2, trip of field excitation and also to the alarm LED 1.
BLOCK
BLK_OPR_LS
BLK_OPR_HS
GUID-4FF775E0-0594-49D2-8C53-E94DB19A533D V2 EN
Figure 144: Differential protection function
Circuit breaker failure protection CCBRBRF1 is initiated via the START input by a
number of different protection functions available in the relay. The breaker failure
protection function offers different operating modes associated with the circuit
breaker position and the measured phase and residual currents.
The circuit breaker failure protection function has two operating outputs: TRRET and
TRBU. The TRRET operating output is used for retripping its own breaker through
TRPPTRC2_TRIP. The TRBU output gives a backup trip to the breaker feeding
upstream. For this purpose, the TRBU operating output signal is connected to the
binary output X100:PO2. In addition, TRBU operating output is also used to trip field
excitation circuit breaker through TRPPTRC6_TRIP_FIELD EXCITATION.
EFHPTOC1
BLOCK OPERATE
ENA_MULT START
OR6
B1
B2
B3
B4
B5
B6
T2PTTR1
OPERATE
START
ALARM
BLK_CLOSE
MPDIF1
OPERATE
OPR_LS
OPR_HS
INT_BLKD
1MRS758272 B
EFHPTOC1_OPERATE
EFHPTOC1_START
O
EF_OPERATE
T2PTTR1_OPERATE
T2PTTR1_START
MPDIF1_OPERATE
MPDIF1_OPR_LS
MPDIF1_OPR_HS
MPDIF1_INT_BLKD
Application Manual
REG615