ABB relion REF615 Applications Manual page 64

Section 3
REF615 standard configurations
58
Non-directional (cross-country) earth-fault protection, using calculated Io,
EFHPTOC1 protects against double earth-fault situations in isolated or compensated
networks. This protection function uses the calculated residual current originating
from the phase currents.
BLOCK
ENA_MULT
GUID-1B0EE37E-F8D6-45E3-9648-7495EF4360D3 V1 EN
Figure 25: Non-directional earth-fault protection
Phase discontinuity protection PDNSPTOC1 protects for interruptions in the normal
three-phase load supply, for example, in downed conductor situations.
BLOCK
GUID-9EC84EEF-5799-4170-8826-85082502D144 V1 EN
Figure 26: Phase discontinuity protection
Three-phase thermal protection for feeders, cables and distribution transformers
T1PTTR1 detects overloads under varying load conditions.
BLK_OPR
ENA_MULT
TEMP_AMB
GUID-4DD81601-4C74-4305-A280-EB0DD2A7D958 V1 EN
Figure 27: Thermal overcurrent protection function
Circuit breaker failure protection CCBRBRF1 is initiated via the START input by
number of different protection functions available in the IED. 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 operate output is used for retripping its own breaker through
TRPPTRC2_TRIP. The TRBU output is used to give a backup trip to the breaker
feeding upstream. For this purpose, the TRBU operate output signal is connected to the
binary output X100:PO2.
EFHPTOC1
OPERATE
START
PDNSPTOC1
OPERATE
START
T1PTTR1
OPERATE
START
ALARM
BLK_CLOSE
1MRS756378 S
EFHPTOC1_OPERATE
EFHPTOC1_START
PDNSPTOC1_OPERATE
PDNSPTOC1_START
T1PTTR1_OPERATE
T1PTTR1_START
T1PTTR1_ALARM
Application Manual
REF615