ABB relion REF615 Applications Manual page 153

1MRS756378 S
REF615
Application Manual
Non-directional earth-fault protection EFHPTOC protects against double earth-fault
situations in isolated or compensated networks. This protection function uses the
calculated residual current originating from the phase currents. The function is
blocked in case of detection of a failure in secondary circuit of current transformer.
CCSPVC1_FAIL
GUID-3ED1B626-C1F0-4001-AB58-546A16B76048 V2 EN
Figure 177: 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. The function is
blocked in case of detection of a failure in secondary circuit of voltage transformer.
CCSPVC1_FAIL
GUID-3C32D680-B07A-4D01-89B0-A0C2CAE89C45 V2 EN
Figure 178: Phase discontinuity protection
Three-phase thermal protection for feeders, cables and distribution transformers
T1PTTR1 detects overloads under varying load conditions. The BLK_CLOSE output
of the function is used to block the closing operation of circuit breaker.
BLK_OPR
ENA_MULT
TEMP_AMB
GUID-0BC59D0E-F0E3-4F46-A4EF-A8D392971CF2 V1 EN
Figure 179: 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 gives a backup trip to the breaker feeding
upstream. For this purpose, the TRBU operate output signal is connected to the binary
output X100:PO2.
REF615 standard configurations
EFHPTOC1
BLOCK OPERATE
ENA_MULT START
PDNSPTOC1
BLOCK OPERATE
START
T1PTTR1
OPERATE
START
ALARM
BLK_CLOSE
Section 3
EFHPTOC1_OPERATE
EFHPTOC1_START
PDNSPTOC1_OPERATE
PDNSPTOC1_START
T1PTTR1_OPERATE
T1PTTR1_START
T1PTTR1_ALARM
T1PTTR1_BLK_CLOSE
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