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. The function is blocked in case of detection of a failure in
secondary circuit of current transformer.
EFHPTOC1
BLOCK
ENA_MULT
OPERATE
START
EFHPTOC1_OPERATE
EFHPTOC1_START
CCSPVC1_FAIL
GUID-60E23765-A067-4FEF-961F-64455744F93D V2 EN
Figure 231: Earth-fault protection function
Phase discontinuity protection PDNSPTOC1 protects from 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.
PDNSPTOC1
BLOCK OPERATE
START
PDNSPTOC1_OPERATE
PDNSPTOC1_START
CCSPVC1_FAIL
GUID-C2943C6D-503D-42E8-B69C-E9D8E7DB69FD V2 EN
Figure 232: Phase discontinuity protection function
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.
T1PTTR1
BLK_OPR
ENA_MULT
TEMP_AMB
OPERATE
START
ALARM
BLK_CLOSE
T1PTTR1_BLK_C LOSE
T1PTTR1_START
T1PTTR1_OPERATE
T1PTTR1_ALARM
GUID-D139F760-E980-4005-A357-84775C585A0A V1 EN
Figure 233: Thermal overcurrent protection function
Circuit breaker failure protection CCBRBRF1 is initiated via the START input by a
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.
Section 3 1MRS756378 S
REF615 standard configurations
176 REF615
Application Manual
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