Non-directional (cross-country) earth-fault protection, using calculated Io,
EFHPTOC1 protects from double earth-fault situations in isolated or compensated
networks. The protection function uses the calculated residual current originating
from the phase currents.
EFHPTOC1
BLOCK
ENA_MULT
OPERATE
START
EFHPTOC1_OPERATE
EFHPTOC1_START
GUID-5F955CEE-D4DA-4562-9D85-A3924AE2E777 V1 EN
Figure 514: Earth-fault protection function
Phase discontinuity protection PDNSPTOC1 protects from interruptions in the
normal three-phase load supply, for example, in downed conductor situations.
PDNSPTOC1
BLOCK OPERATE
START
PDNSPTOC1_OPERATE
PDNSPTOC1_START
GUID-4030CC9B-C67C-4C3F-9735-046BCA54C9A2 V1 EN
Figure 515: 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.
T1PTTR1
BLK_OPR
ENA_MULT
TEMP_AMB
OPERATE
START
ALARM
BLK_CLOSE
T1PTTR1_BLK_C LOSE
T1PTTR1_START
T1PTTR1_OPERATE
T1PTTR1_ALARM
GUID-D24BA182-57B6-45D4-9D7D-DE6431A2D40D V1 EN
Figure 516: 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 same TRRET output is also connected to the binary output
X100:PO4.
Section 3 1MRS756378 S
REF615 standard configurations
332 REF615
Application Manual
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