### Overview

The “Directional residual overcurrent protection four steps (EF4PTOC)” function can be used as main protection for phase-to-earth faults. It can also be used to provide a system back-up, for example, in the case of the primary protection being out of service due to communication or voltage transformer circuit failure.

For more detailed information on “Directional residual overcurrent protection four steps (EF4PTOC)” function, refer to ABB, Relion 670 Series manuals.

To see other supported functions, click here.

#### EF4PTOC Identification

Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |

Directional residual overcurrent protection, four steps | EF4PTOC | 4(3I>) 4I–c–I 4I—–I |
51N_67N |

### Signals & Setting Parameters

#### EF4PTOC function block

#### EF4PTOC Input signals

EF4PTOC Input signals | |||

Name | Type | Default | Description |

I3P | GROUP SIGNAL | – | Group connection for operate current |

U3P | GROUP SIGNAL | – | Group connection for polarizing voltage |

I3PPOL | GROUP SIGNAL | – | Group connection for polarizing current |

I3PDIR | GROUP SIGNAL | – | Group connection for directional current |

BLOCK | BOOLEAN | 0 | General block |

BLKTR | BOOLEAN | 0 | Block of trip |

BLKST1 | BOOLEAN | 0 | Block of step 1 (Start and trip) |

BLKST2 | BOOLEAN | 0 | Block of step 2 (Start and trip) |

BLKST3 | BOOLEAN | 0 | Block of step 3 (Start and trip) |

BLKST4 | BOOLEAN | 0 | Block of step 4 (Start and trip) |

ENMULT1 | BOOLEAN | 0 | When activated, the current multiplier is in use for step1 |

ENMULT2 | BOOLEAN | 0 | When activated, the current multiplier is in use for step2 |

ENMULT3 | BOOLEAN | 0 | When activated, the current multiplier is in use for step3 |

ENMULT4 | BOOLEAN | 0 | When activated, the current multiplier is in use for step4 |

CBPOS | BOOLEAN | 0 | Breaker position |

CLOSECB | BOOLEAN | 0 | Breaker close command |

OPENCB | BOOLEAN | 0 | Breaker open command |

#### EF4PTOC Output signals

EF4PTOC Output signals | |||

Name | Type | Description | |

TRIP | BOOLEAN | General trip signal | |

TRIN1 | BOOLEAN | Trip signal from step 1 | |

TRIN2 | BOOLEAN | Trip signal from step 2 | |

TRIN3 | BOOLEAN | Trip signal from step 3 | |

TRIN4 | BOOLEAN | Trip signal from step 4 | |

TRSOTF | BOOLEAN | Trip signal from earth fault switch onto fault function | |

START | BOOLEAN | General start signal | |

STIN1 | BOOLEAN | Start signal step 1 | |

STIN2 | BOOLEAN | Start signal step 2 | |

STIN3 | BOOLEAN | Start signal step 3 | |

STIN4 | BOOLEAN | Start signal step 4 | |

STSOTF | BOOLEAN | Start signal from earth fault switch onto fault function | |

STFW | BOOLEAN | Start signal forward direction | |

STRV | BOOLEAN | Start signal reverse direction | |

2NDHARMD | BOOLEAN | 2nd harmonic block signal | |

#### EF4PTOC Group settings (basic)

EF4PTOC Group settings (basic) | |||||

Name | Values (Range) | Unit | Step | Default | Description |

Operation | Off On |
– | – | Off | Operation Off / On |

EnDir | Disable Enable |
– | – | Enable | Enabling the Directional calculation |

AngleRCA | -180 – 180 | Deg | 1 | 65 | Relay Characteristic Angle (RCA) |

polMethod | Voltage Current Dual |
– | – | Voltage | Type of polarization |

UPolMin | 1 – 100 | %UB | 1 | 1 | Minimum voltage level for polarization in % of UBase |

IPolMin | 2 – 100 | %IB | 1 | 5 | Minimum current level for polarization in % of IBase |

RNPol | 0.50 – 1000.00 | Ohm | 0.01 | 5.00 | Real part of source impedance used for current polarisation |

XNPol | 0.50 – 3000.00 | Ohm | 0.01 | 40.00 | Imaginary part of source imp. used for current polarisation |

IN>Dir | 1 – 100 | %IB | 1 | 10 | Residual current level in % of IBase for Direction release |

2ndHarmStab | 5 – 100 | % | 1 | 20 | Operate level of 2nd harmonic curr
in % of fundamental curr |

BlkParTransf | Off On |
– | – | Off | Enable blocking at energizing of parallel transformers |

UseStartValue | IN1> IN2> IN3> IN4> |
– | – | IN4> | Current level blk at parallel transf (step1, 2, 3 or 4) |

SOTF | Off SOTF UnderTime SOTF&UnderTime |
– | – | Off | SOTF operation mode (Off/SOTF/ Undertime/SOTF&Undertime) |

ActivationSOTF | Open Closed CloseCommand |
– | – | Open | Select signal to activate SOTF: CB- Open/ -Closed/ -Close cmd |

StepForSOTF | Step 2 Step 3 |
– | – | Step 2 | Select start from step 2 or 3 to start SOTF |

HarmBlkSOTF | Off On |
– | – | Off | Enable harmonic restrain function in SOTF |

tSOTF | 0.000 – 60.000 | s | 0.001 | 0.200 | Time delay for SOTF |

t4U | 0.000 – 60.000 | s | 0.001 | 1.000 | Switch-onto-fault active time |

ActUnderTime | CB position CB command |
– | – | CB position | Select signal to activate under time (CB Pos / CB Command) |

tUnderTime | 0.000 – 60.000 | s | 0.001 | 0.300 | Time delay for under time |

DirMode1 | Off Non-directional Forward Reverse |
– | – | Non-directional | Directional mode of step 1 (Off, Non- dir, Forward, Reverse) |

Characterist1 | ANSI Ext. inv. ANSI Very inv. ANSI Norm. inv. ANSI Mod. inv. ANSI Def. Time L.T.E. inv. L.T.V. inv. L.T. inv. IEC Norm. inv. IEC Very inv. IEC inv. IEC Ext. inv. IEC S.T. inv. IEC L.T. inv. IEC Def. Time Reserved Programmable RI type RD type |
– | – | ANSI Def. Time | Time delay characteristic for step 1 |

IN1> | 1 – 2500 | %IB | 1 | 100 | Residual current operate level for step 1 in % of IBase |

t1 | 0.000 – 60.000 | s | 0.001 | 0.000 | Def time delay or add time delay for inverse char of step 1 |

k1 | 0.05 – 999.00 | – | 0.01 | 0.05 | Time multiplier for the step 1 selected time characteristic |

IMin1 | 1.00 – 10000.00 | %IB | 1.00 | 100.00 | Minimum operate residual current for step 1 in % of IBase |

t1Min | 0.000 – 60.000 | s | 0.001 | 0.000 | Minimum operate time for inverse time characteristic step 1 |

IN1Mult | 1.0 – 10.0 | – | 0.1 | 2.0 | Multiplier for the residual current setting value for step 1 |

HarmBlock1 | Off On |
– | – | On | Enable block of step 1 from harmonic restrain |

DirMode2 | Off Non-directional Forward Reverse |
– | – | Non-directional | Directional mode of step 2 (Off, Non- dir, Forward, Reverse) |

Characterist2 | ANSI Ext. inv. ANSI Very inv. ANSI Norm. inv. ANSI Mod. inv. ANSI Def. Time L.T.E. inv. L.T.V. inv. L.T. inv. IEC Norm. inv. IEC Very inv. IEC inv. IEC Ext. inv. IEC S.T. inv. IEC L.T. inv. IEC Def. Time Reserved Programmable RI type RD type |
– | – | ANSI Def. Time | Time delay characteristic for step 2 |

IN2> | 1 – 2500 | %IB | 1 | 50 | Residual current operate level for step 2 in % of IBase |

t2 | 0.000 – 60.000 | s | 0.001 | 0.400 | Def time delay or add time delay for inverse char of step 2 |

k2 | 0.05 – 999.00 | – | 0.01 | 0.05 | Time multiplier for the step 2 selected time characteristic |

IMin2 | 1.00 – 10000.00 | %IB | 1.00 | 50 | Minimum operate residual current for step 2 in % of IBase |

t2Min | 0.000 – 60.000 | s | 0.001 | 0.000 | Minimum operate time for inverse time characteristic step 2 |

IN2Mult | 1.0 – 10.0 | – | 0.1 | 2.0 | Multiplier for the residual current setting value for step 2 |

HarmBlock2 | Off On |
– | – | On | Enable block of step 2 from harmonic restrain |

DirMode3 | Off Non-directional Forward Reverse |
– | – | Non-directional | Directional mode of step 3 (Off, Non- dir, Forward, Reverse) |

Characterist3 | ANSI Ext. inv. ANSI Very inv. ANSI Norm. inv. ANSI Mod. inv. ANSI Def. Time L.T.E. inv. L.T.V. inv. L.T. inv. IEC Norm. inv. IEC Very inv. IEC inv. IEC Ext. inv. IEC S.T. inv. IEC L.T. inv. IEC Def. Time Reserved Programmable RI type RD type |
– | – | ANSI Def. Time | Time delay characteristic for step 3 |

IN3> | 1 – 2500 | %IB | 1 | 33 | Residual current operate level for step 3 in % of IBase |

t3 | 0.000 – 60.000 | s | 0.001 | 0.800 | Def time delay or add time delay for inverse char of step 3 |

k3 | 0.05 – 999.00 | – | 0.01 | 0.05 | Time multiplier for the step 3 selected time characteristic |

IMin3 | 1.00 – 10000.00 | %IB | 1.00 | 33 | Minimum operate residual current for step 3 in % of IBase |

t3Min | 0.000 – 60.000 | s | 0.001 | 0.000 | Minimum operate time for inverse time characteristic step 3 |

IN3Mult | 1.0 – 10.0 | – | 0.1 | 2.0 | Multiplier for the residual current setting value for step 3 |

HarmBlock3 | Off On |
– | – | On | Enable block of step 3 from harmonic restrain |

DirMode4 | Off Non-directional Forward Reverse |
– | – | Non-directional | Directional mode of step 4 (Off, Non- dir, Forward, Reverse) |

Characterist4 | ANSI Ext. inv. ANSI Very inv. ANSI Norm. inv. ANSI Mod. inv. ANSI Def. Time L.T.E. inv. L.T.V. inv. L.T. inv. IEC Norm. inv. IEC Very inv. IEC inv. IEC Ext. inv. IEC S.T. inv. IEC L.T. inv. IEC Def. Time Reserved Programmable RI type RD type |
– | – | ANSI Def. Time | Time delay characteristic for step 4 |

IN4> | 1 – 2500 | %IB | 1 | 17 | Residual current operate level for step 4 in % of IBase |

t4 | 0.000 – 60.000 | s | 0.001 | 1.200 | Def time delay or add time delay for inverse char of step 4 |

k4 | 0.05 – 999.00 | – | 0.01 | 0.05 | Time multiplier for the step 4 selected time characteristic |

IMin4 | 1.00 – 10000.00 | %IB | 1.00 | 17 | Minimum operate residual current for step 4 in % of IBase |

t4Min | 0.000 – 60.000 | s | 0.001 | 0.000 | Minimum operate time for inverse time characteristic step 4 |

IN4Mult | 1.0 – 10.0 | – | 0.1 | 2.0 | Multiplier for the residual current setting value for step 4 |

HarmBlock4 | Off On |
– | – | On | Enable block of step 4 from harmonic restrain |

#### EF4PTOC Group settings (advanced)

EF4PTOC Group settings (advanced) | |||||

Name | Values (Range) | Unit | Step | Default | Description |

IN1>Min | 1 – 2500 | %IB | 1 | 1 | Minimum used operate residual current level for step 1 in % of IBase, if IN1> is less than IN1>Min then IN1> is set to IN1>Min |

IN1>Max | 1 – 2500 | %IB | 1 | 2500 | Maximum used operate residual current level for step 1 in % of IBase, if IN1> is greater than IN1>Max then IN1> is set to IN1>Max |

ResetTypeCrv1 | Instantaneous IEC Reset ANSI reset |
– | – | Instantaneous | Reset curve type for step1 (Instantaneous / IEC / ANSI) |

tReset1 | 0.000 – 60.000 | s | 0.001 | 0.020 | Reset time delay for step 1 |

tPCrv1 | 0.005 – 3.000 | – | 0.001 | 1.000 | Param P for customized inverse trip time curve for step 1 |

tACrv1 | 0.005 – 200.000 | – | 0.001 | 13.500 | Param A for customized inverse trip time curve for step 1 |

tBCrv1 | 0.00 – 20.00 | – | 0.01 | 0.00 | Param B for customized inverse trip time curve for step 1 |

tCCrv1 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param C for customized inverse trip time curve for step 1 |

tPRCrv1 | 0.005 – 3.000 | – | 0.001 | 0.500 | Param PR for customized inverse reset time curve for step 1 |

tTRCrv1 | 0.005 – 100.000 | – | 0.001 | 13.500 | Param TR for customized inverse reset time curve for step 1 |

tCRCrv1 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param CR for customized inverse reset time curve for step 1 |

IN2>Min | 1 – 2500 | %IB | 1 | 1 | Minimum used operate residual current level for step 2 in % of IBase, if IN2> is less than IN2>Min then IN2> is set to IN2>Min |

IN2>Max | 1 – 2500 | %IB | 1 | 2500 | Maximum used operate residual current level for step 2 in % of IBase, if IN2> is greater than IN2>Max then IN2> is set to IN2>Max |

ResetTypeCrv2 | Instantaneous IEC Reset ANSI reset |
– | – | Instantaneous | Reset curve type for step2 (Instantaneous / IEC / ANSI) |

tReset2 | 0.000 – 60.000 | s | 0.001 | 0.020 | Reset time delay for step 2 |

tPCrv2 | 0.005 – 3.000 | – | 0.001 | 1.000 | Param P for customized inverse trip time curve for step 2 |

tACrv2 | 0.005 – 200.000 | – | 0.001 | 13.500 | Param A for customized inverse trip time curve for step 2 |

tBCrv2 | 0.00 – 20.00 | – | 0.01 | 0.00 | Param B for customized inverse trip time curve for step 2 |

tCCrv2 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param C for customized inverse trip time curve for step 2 |

tPRCrv2 | 0.005 – 3.000 | – | 0.001 | 0.500 | Param PR for customized inverse reset time curve for step 2 |

tTRCrv2 | 0.005 – 100.000 | – | 0.001 | 13.500 | Param TR for customized inverse reset time curve for step 2 |

tCRCrv2 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param CR for customized inverse reset time curve for step 2 |

IN3>Min | 1 – 2500 | %IB | 1 | 1 | Minimum used operate residual current level for step 3 in % of IBase, if IN3> is less than IN3>Min then IN3> is set to IN3>Min |

IN3>Max | 1 – 2500 | %IB | 1 | 2500 | Maximum used operate residual current level for step 3 in % of IBase, if IN3> is greater than IN3>Max then IN3> is set to IN3>Max |

ResetTypeCrv3 | Instantaneous IEC Reset ANSI reset |
– | – | Instantaneous | Reset curve type for step3 (Instantaneous / IEC / ANSI) |

tReset3 | 0.000 – 60.000 | s | 0.001 | 0.020 | Reset time delay for step 3 |

tPCrv3 | 0.005 – 3.000 | – | 0.001 | 1.000 | Param P for customized inverse trip time curve for step 3 |

tACrv3 | 0.005 – 200.000 | – | 0.001 | 13.500 | Param A for customized inverse trip time curve for step 3 |

tBCrv3 | 0.00 – 20.00 | – | 0.01 | 0.00 | Param B for customized inverse trip time curve for step 3 |

tCCrv3 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param C for customized inverse trip time curve for step 3 |

tPRCrv3 | 0.005 – 3.000 | – | 0.001 | 0.500 | Param PR for customized inverse reset time curve for step 3 |

tTRCrv3 | 0.005 – 100.000 | – | 0.001 | 13.500 | Param TR for customized inverse reset time curve for step 3 |

tCRCrv3 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param CR for customized inverse reset time curve for step 3 |

IN4>Min | 1 – 2500 | %IB | 1 | 1 | Minimum used operate residual current level for step 4 in % of IBase, if IN4> is less than IN4>Min then IN4> is set to IN4>Min |

IN4>Max | 1 – 2500 | %IB | 1 | 2500 | Maximum used operate residual current level for step 4 in % of IBase, if IN4> is greater than IN4>Max then IN4> is set to IN4>Max |

ResetTypeCrv4 | Instantaneous IEC Reset ANSI reset |
– | – | Instantaneous | Reset curve type for step4 (Instantaneous / IEC / ANSI) |

tReset4 | 0.000 – 60.000 | s | 0.001 | 0.020 | Reset time delay for step 4 |

tPCrv4 | 0.005 – 3.000 | – | 0.001 | 1.000 | Param P for customized inverse trip time curve for step 4 |

tACrv4 | 0.005 – 200.000 | – | 0.001 | 13.500 | Param A for customized inverse trip time curve for step 4 |

tBCrv4 | 0.00 – 20.00 | – | 0.01 | 0.00 | Param B for customized inverse trip time curve for step 4 |

tCCrv4 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param C for customized inverse trip time curve for step 4 |

tPRCrv4 | 0.005 – 3.000 | – | 0.001 | 0.500 | Param PR for customized inverse reset time curve for step 4 |

tTRCrv4 | 0.005 – 100.000 | – | 0.001 | 13.500 | Param TR for customized inverse reset time curve for step 4 |

tCRCrv4 | 0.1 – 10.0 | – | 0.1 | 1.0 | Param CR for customized inverse reset time curve for step 4 |

#### EF4PTOC Non group settings (basic)

EF4PTOC Non group settings (basic) | |||||

Name | Values (Range) | Unit | Step | Default | Description |

GlobalBaseSel | 1 – 12 | – | 1 | 1 | Selection of one of the Global Base Value groups |

SeqTypeIDir | Zero seq Neg seq |
– | – | Zero seq | Choice of measurand for directional current |

SeqTypeIPol | Zero seq Neg seq |
– | – | Zero seq | Choice of measurand for polarizing current |

SeqTypeUPol | Zero seq Neg seq |
– | – | Zero seq | Choice of measurand for polarizing voltage |

#### EF4PTOC Monitored data

EF4PTOC Monitored data | ||||

Name | Type | Values (Range) | Unit | Description |

IOp | REAL | – | A | Operating current level |

UPol | REAL | – | kV | Polarizing voltage level |

IPol | REAL | – | A | Polarizing current level |

UPOLIANG | REAL | – | deg | Polarizing angle between voltage and current |

IPOLIANG | REAL | – | deg | Polarizing current angle |