A dedicated non-directional earth-fault protection block EFHPTOC 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-F3F7FE78-72D3-4491-AF23-BA53F8ED35D7 V1 EN
Figure 61: Non-directional earth-fault protection
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-1B82152F-2E3C-4894-8E9C-8148BE01D12C V1 EN
Figure 62: Phase discontinuity protection
Three-phase thermal protection for feeders, cables and distribution transformers
T1PTTR1 detects overloads under varying load conditions.
T1PTTR1
BLK_OPR
ENA_MULT
TEMP_AMB
OPERATE
START
ALARM
BLK_CLOSE
T1PTTR1_START
T1PTTR1_OPERATE
T1PTTR1_ALARM
GUID-EBDA9A91-9075-4D0F-8B3F-E3035732C9B1 V1 EN
Figure 63: 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 output TRBU 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.
CCBRBRF1
BLOCK
START
POSCLOSE
CB_FAULT
CB_FAULT_AL
TRBU
TRRET
OR6
B1
B2
B3
B4
B5
B6
O
OR6
B1
B2
B3
B4
B5
B6
O
OR6
B1
B2
B3
B4
B5
B6
O
CCBRBRF1_TRBU
X120_BI2_CB_CLOSED
PHIPTOC1_OPERATE
PHHPTOC1_OPERATE
PHHPTOC2_OPERATE
EFPADM2_OPERATE
EFPADM3_OPERATE
DEFHPDEF1_OPERATE
DEFLPDEF2_OPERATE
WPWDE2_OPERATE
WPWDE3_OPERATE
ARCSARC1_OPERATE
ARCSARC2_OPERATE
ARCSARC3_OPERATE
CCBRBRF1_TRRET
GUID-3CC55117-F6EF-4ABF-BF0E-FFC78F84833A V1 EN
Figure 64: Circuit breaker failure protection function
1MRS756378 S Section 3
REF615 standard configurations
REF615 81
Application Manual
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