Overview
The “General current and voltage protection (CVGAPC)” can be utilized as a negative sequence current protection detecting unsymmetrical conditions such as open phase or unsymmetrical faults. It can also be used to improve phase selection for high resistive earth faults, outside the distance protection reach, for the transmission line.
For more detailed information on “General current and voltage protection (CVGAPC)”, refer to ABB, Relion 670 Series manuals.
To see other supported functions, click here.
Function Identification
| Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
| General current and voltage protection | CVGAPC | 2(I>/U<) | – |
Signals & Setting Parameters
CVGAPC function block
CVGAPC Input signals
| CVGAPC Input signals | |||
| Name | Type | Default | Description |
| I3P | GROUP SIGNAL | – | Group signal for current input |
| U3P | GROUP SIGNAL | – | Group signal for voltage input |
| BLOCK | BOOLEAN | 0 | Block of function |
| BLKOC1 | BOOLEAN | 0 | Block of over current function OC1 |
| BLKOC1TR | BOOLEAN | 0 | Block of trip for over current function OC1 |
| ENMLTOC1 | BOOLEAN | 0 | When activated, the current multiplier is in use for OC1 |
| BLKOC2 | BOOLEAN | 0 | Block of over current function OC2 |
| BLKOC2TR | BOOLEAN | 0 | Block of trip for over current function OC2 |
| ENMLTOC2 | BOOLEAN | 0 | When activated, the current multiplier is in use for OC2 |
| BLKUC1 | BOOLEAN | 0 | Block of under current function UC1 |
| BLKUC1TR | BOOLEAN | 0 | Block of trip for under current function UC1 |
| BLKUC2 | BOOLEAN | 0 | Block of under current function UC2 |
| BLKUC2TR | BOOLEAN | 0 | Block of trip for under current function UC2 |
| BLKOV1 | BOOLEAN | 0 | Block of over voltage function OV1 |
| BLKOV1TR | BOOLEAN | 0 | Block of trip for over voltage function OV1 |
| BLKOV2 | BOOLEAN | 0 | Block of over voltage function OV2 |
| BLKOV2TR | BOOLEAN | 0 | Block of trip for over voltage function OV2 |
| BLKUV1 | BOOLEAN | 0 | Block of under voltage function UV1 |
| BLKUV1TR | BOOLEAN | 0 | Block of trip for under voltage function UV1 |
| BLKUV2 | BOOLEAN | 0 | Block of under voltage function UV2 |
| BLKUV2TR | BOOLEAN | 0 | Block of trip for under voltage function UV2 |
CVGAPC Output signals
| CVGAPC Output signals | |||
| Name | Type | Description | |
| TRIP | BOOLEAN | General trip signal | |
| TROC1 | BOOLEAN | Trip signal from overcurrent function OC1 | |
| TROC2 | BOOLEAN | Trip signal from overcurrent function OC2 | |
| TRUC1 | BOOLEAN | Trip signal from undercurrent function UC1 | |
| TRUC2 | BOOLEAN | Trip signal from undercurrent function UC2 | |
| TROV1 | BOOLEAN | Trip signal from overvoltage function OV1 | |
| TROV2 | BOOLEAN | Trip signal from overvoltage function OV2 | |
| TRUV1 | BOOLEAN | Trip signal from undervoltage function UV1 | |
| TRUV2 | BOOLEAN | Trip signal from undervoltage function UV2 | |
| START | BOOLEAN | General start signal | |
| STOC1 | BOOLEAN | Start signal from overcurrent function OC1 | |
| STOC2 | BOOLEAN | Start signal from overcurrent function OC2 | |
| STUC1 | BOOLEAN | Start signal from undercurrent function UC1 | |
| STUC2 | BOOLEAN | Start signal from undercurrent function UC2 | |
| STOV1 | BOOLEAN | Start signal from overvoltage function OV1 | |
| STOV2 | BOOLEAN | Start signal from overvoltage function OV2 | |
| STUV1 | BOOLEAN | Start signal from undervoltage function UV1 | |
| STUV2 | BOOLEAN | Start signal from undervoltage function UV2 | |
| BLK2ND | BOOLEAN | Block from second harmonic detection | |
| DIROC1 | INTEGER | Directional mode of OC1 (nondir, forward,reverse) | |
| DIROC2 | INTEGER | Directional mode of OC2 (nondir, forward,reverse) | |
| UDIRLOW | BOOLEAN | Low voltage for directional polarization | |
| CURRENT | REAL | Measured current value | |
| ICOSFI | REAL | Measured current multiplied with cos (Phi) | |
| VOLTAGE | REAL | Measured voltage value | |
| UIANGLE | REAL | Angle between voltage and current | |
CVGAPC Group settings (basic)
| CVGAPC Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off / On |
| CurrentInput | phase1 phase2 phase3 PosSeq NegSeq 3*ZeroSeq MaxPh MinPh UnbalancePh phase1-phase2 phase2-phase3 phase3-phase1 MaxPh-Ph MinPh-Ph UnbalancePh-Ph |
– | – | MaxPh | Select current signal which will be measured inside function |
| VoltageInput | phase1 phase2 phase3 PosSeq -NegSeq -3*ZeroSeq MaxPh MinPh UnbalancePh phase1-phase2 phase2-phase3 phase3-phase1 MaxPh-Ph MinPh-Ph UnbalancePh-Ph |
– | – | MaxPh | Select voltage signal which will be measured inside function |
| OperHarmRestr | Off On |
– | – | Off | Operation of 2nd harmonic restrain Off / On |
| l_2nd/l_fund | 10.0 – 50.0 | % | 1.0 | 20.0 | Ratio of second to fundamental current harmonic in % |
| BlkLevel2nd | 10 – 5000 | %IB | 1 | 5000 | Harm analyse disabled above this current level in % of fundamental current |
| EnRestrainCurr | Off On |
– | – | Off | Enable current restrain function On / Off |
| RestrCurrInput | PosSeq NegSeq 3*ZeroSeq Max |
– | – | PosSeq | Select current signal which will be used for curr restrain |
| RestrCurrCoeff | 0.00 – 5.00 | – | 0.01 | 0.00 | Restraining current coefficient |
| RCADir | -180 – 180 | Deg | 1 | -75 | Relay Characteristic Angle |
| ROADir | 1 – 90 | Deg | 1 | 75 | Relay Operate Angle |
| LowVolt_VM | 0.0 – 5.0 | %UB | 0.1 | 0.5 | Below this level in % of UBase setting ActLowVolt takes over |
| Operation_OC1 | Off On |
– | – | Off | Operation OC1 Off / On |
| StartCurr_OC1 | 2.0 – 5000.0 | %IB | 1.0 | 120.0 | Operate current level for OC1 in % of IBase |
| CurveType_OC1 | 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 Programmable RI type RD type |
– | – | ANSI Def. Time | Selection of time delay curve type for OC1 |
| tDef_OC1 | 0.00 – 6000.00 | s | 0.01 | 0.50 | Independent (definite) time delay of OC1 |
| k_OC1 | 0.05 – 999.00 | – | 0.01 | 0.30 | Time multiplier for the dependent time delay for OC1 |
| IMin1 | 1 – 10000 | %IB | 1 | 100 | Minimum operate current for step1
in % of IBase |
| tMin_OC1 | 0.00 – 6000.00 | s | 0.01 | 0.05 | Minimum operate time for IEC IDMT curves for OC1 |
| VCntrlMode_OC1 | Voltage control Off |
– | – | Off | Control mode for voltage controlled OC1 function |
| VDepMode_OC1 | Step Slope |
– | – | Step | Voltage dependent mode OC1 (step, slope) |
| VDepFact_OC1 | 0.02 – 5.00 | – | 0.01 | 1.00 | Multiplying factor for I pickup when OC1 is U dependent |
| ULowLimit_OC1 | 1.0 – 200.0 | %UB | 0.1 | 50.0 | Voltage low limit setting OC1 in % of UBase |
| UHighLimit_OC1 | 1.0 – 200.0 | %UB | 0.1 | 100.0 | Voltage high limit setting OC1 in % of UBase |
| HarmRestr_OC1 | Off On |
– | – | Off | Enable block of OC1 by 2nd harmonic restrain |
| DirMode_OC1 | Non-directional Forward Reverse |
– | – | Non-directional | Directional mode of OC1 (nondir, forward, reverse) |
| DirPrinc_OC1 | I&U IcosPhi&U |
– | – | I&U | Measuring on IandU or IcosPhiandU for OC1 |
| ActLowVolt1_VM | Non-directional Block Memory |
– | – | Non-directional | Low voltage level action for Dir_OC1 (Nodir, Blk, Mem) |
| Operation_OC2 | Off On |
– | – | Off | Operation OC2 Off / On |
| StartCurr_OC2 | 2.0 – 5000.0 | %IB | 1.0 | 120.0 | Operate current level for OC2 in % of IBase |
| CurveType_OC2 | 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 Programmable RI type RD type |
– | – | ANSI Def. Time | Selection of time delay curve type for OC2 |
| tDef_OC2 | 0.00 – 6000.00 | s | 0.01 | 0.50 | Independent (definite) time delay of OC2 |
| k_OC2 | 0.05 – 999.00 | – | 0.01 | 0.30 | Time multiplier for the dependent time delay for OC2 |
| IMin2 | 1 – 10000 | %IB | 1 | 50 | Minimum operate current for step2
in % of IBase |
| tMin_OC2 | 0.00 – 6000.00 | s | 0.01 | 0.05 | Minimum operate time for IEC IDMT curves for OC2 |
| VCntrlMode_OC2 | Voltage control Off |
– | – | Off | Control mode for voltage controlled OC2 function |
| VDepMode_OC2 | Step Slope |
– | – | Step | Voltage dependent mode OC2 (step, slope) |
| VDepFact_OC2 | 0.02 – 5.00 | – | 0.01 | 1.00 | Multiplying factor for I pickup when OC2 is U dependent |
| ULowLimit_OC2 | 1.0 – 200.0 | %UB | 0.1 | 50.0 | Voltage low limit setting OC2 in % of UBase |
| UHighLimit_OC2 | 1.0 – 200.0 | %UB | 0.1 | 100.0 | Voltage high limit setting OC2 in % of UBase |
| HarmRestr_OC2 | Off On |
– | – | Off | Enable block of OC2 by 2nd harmonic restrain |
| DirMode_OC2 | Non-directional Forward Reverse |
– | – | Non-directional | Directional mode of OC2 (nondir, forward, reverse) |
| DirPrinc_OC2 | I&U IcosPhi&U |
– | – | I&U | Measuring on IandU or IcosPhiandU for OC2 |
| ActLowVolt2_VM | Non-directional Block Memory |
– | – | Non-directional | Low voltage level action for Dir_OC2 (Nodir, Blk, Mem) |
| Operation_UC1 | Off On |
– | – | Off | Operation UC1 Off / On |
| EnBlkLowI_UC1 | Off On |
– | – | Off | Enable internal low current level blocking for UC1 |
| BlkLowCurr_UC1 | 0 – 150 | %IB | 1 | 20 | Internal low current blocking level for UC1 in % of IBase |
| StartCurr_UC1 | 2.0 – 150.0 | %IB | 1.0 | 70.0 | Operate undercurrent level for UC1
in % of IBase |
| tDef_UC1 | 0.00 – 6000.00 | s | 0.01 | 0.50 | Independent (definite) time delay of UC1 |
| tResetDef_UC1 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay used in IEC Definite Time curve UC1 |
| HarmRestr_UC1 | Off On |
– | – | Off | Enable block of UC1 by 2nd harmonic restrain |
| Operation_UC2 | Off On |
– | – | Off | Operation UC2 Off / On |
| EnBlkLowI_UC2 | Off On |
– | – | Off | Enable internal low current level blocking for UC2 |
| BlkLowCurr_UC2 | 0 – 150 | %IB | 1 | 20 | Internal low current blocking level for UC2 in % of IBase |
| StartCurr_UC2 | 2.0 – 150.0 | %IB | 1.0 | 70.0 | Operate undercurrent level for UC2
in % of IBase |
| tDef_UC2 | 0.00 – 6000.00 | s | 0.01 | 0.50 | Independent (definite) time delay of UC2 |
| HarmRestr_UC2 | Off On |
– | – | Off | Enable block of UC2 by 2nd harmonic restrain |
| Operation_OV1 | Off On |
– | – | Off | Operation OV1 Off / On |
| StartVolt_OV1 | 2.0 – 200.0 | %UB | 0.1 | 150.0 | Operate voltage level for OV1 in % of UBase |
| CurveType_OV1 | Definite time Inverse curve A Inverse curve B Inverse curve C Prog. inv. Curve |
– | – | Definite time | Selection of time delay curve type for OV1 |
| tDef_OV1 | 0.00 – 6000.00 | s | 0.01 | 1.00 | Operate time delay in sec for definite time use of OV1 |
| tMin_OV1 | 0.00 – 6000.00 | s | 0.01 | 0.05 | Minimum operate time for IDMT curves for OV1 |
| k_OV1 | 0.05 – 999.00 | – | 0.01 | 0.30 | Time multiplier for the dependent time delay for OV1 |
| Operation_OV2 | Off On |
– | – | Off | Operation OV2 Off / On |
| StartVolt_OV2 | 2.0 – 200.0 | %UB | 0.1 | 150.0 | Operate voltage level for OV2 in % of UBase |
| CurveType_OV2 | Definite time Inverse curve A Inverse curve B Inverse curve C Prog. inv. Curve |
– | – | Definite time | Selection of time delay curve type for OV2 |
| tDef_OV2 | 0.00 – 6000.00 | s | 0.01 | 1.00 | Operate time delay in sec for definite time use of OV2 |
| tMin_OV2 | 0.00 – 6000.00 | s | 0.01 | 0.05 | Minimum operate time for IDMT curves for OV2 |
| k_OV2 | 0.05 – 999.00 | – | 0.01 | 0.30 | Time multiplier for the dependent time delay for OV2 |
| Operation_UV1 | Off On |
– | – | Off | Operation UV1 Off / On |
| StartVolt_UV1 | 2.0 – 150.0 | %UB | 0.1 | 50.0 | Operate undervoltage level for UV1
in % of UBase |
| CurveType_UV1 | Definite time Inverse curve A Inverse curve B Prog. inv. Curve |
– | – | Definite time | Selection of time delay curve type for UV1 |
| tDef_UV1 | 0.00 – 6000.00 | s | 0.01 | 1.00 | Operate time delay in sec for definite time use of UV1 |
| tMin_UV1 | 0.00 – 6000.00 | s | 0.01 | 0.05 | Minimum operate time for IDMT curves for UV1 |
| k_UV1 | 0.05 – 999.00 | – | 0.01 | 0.30 | Time multiplier for the dependent time delay for UV1 |
| EnBlkLowV_UV1 | Off On |
– | – | On | Enable internal low voltage level blocking for UV1 |
| BlkLowVolt_UV1 | 0.0 – 5.0 | %UB | 0.1 | 0.5 | Internal low voltage blocking level for UV1 in % of UBase |
| Operation_UV2 | Off On |
– | – | Off | Operation UV2 Off / On |
| StartVolt_UV2 | 2.0 – 150.0 | %UB | 0.1 | 50.0 | Operate undervoltage level for UV2
in % of UBase |
| CurveType_UV2 | Definite time Inverse curve A Inverse curve B Prog. inv. curve |
– | – | Definite time | Selection of time delay curve type for UV2 |
| tDef_UV2 | 0.00 – 6000.00 | s | 0.01 | 1.00 | Operate time delay in sec for definite time use of UV2 |
| tMin_UV2 | 0.00 – 6000.00 | s | 0.01 | 0.05 | Minimum operate time for IDMT curves for UV2 |
| k_UV2 | 0.05 – 999.00 | – | 0.01 | 0.30 | Time multiplier for the dependent time delay for UV2 |
| EnBlkLowV_UV2 | Off On |
– | – | On | Enable internal low voltage level blocking for UV2 |
| BlkLowVolt_UV2 | 0.0 – 5.0 | %UB | 0.1 | 0.5 | Internal low voltage blocking level for UV2 in % of UBase |
CVGAPC Group settings (advanced)
| CVGAPC Group settings (advanced) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| CurrMult_OC1 | 1.0 – 10.0 | – | 0.1 | 2.0 | Multiplier for scaling the current setting value for OC1 |
| ResCrvType_OC1 | Instantaneous IEC Reset ANSI reset |
– | – | Instantaneous | Selection of reset curve type for OC1 |
| tResetDef_OC1 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay used in IEC Definite Time curve OC1 |
| P_OC1 | 0.001 – 10.000 | – | 0.001 | 0.020 | Parameter P for customer programmable curve for OC1 |
| A_OC1 | 0.000 – 999.000 | – | 0.001 | 0.140 | Parameter A for customer programmable curve for OC1 |
| B_OC1 | 0.000 – 99.000 | – | 0.001 | 0.000 | Parameter B for customer programmable curve for OC1 |
| C_OC1 | 0.000 – 1.000 | – | 0.001 | 1.000 | Parameter C for customer programmable curve for OC1 |
| PR_OC1 | 0.005 – 3.000 | – | 0.001 | 0.500 | Parameter PR for customer programmable curve for OC1 |
| TR_OC1 | 0.005 – 600.000 | – | 0.001 | 13.500 | Parameter TR for customer programmable curve for OC1 |
| CR_OC1 | 0.1 – 10.0 | – | 0.1 | 1.0 | Parameter CR for customer programmable curve for OC1 |
| CurrMult_OC2 | 1.0 – 10.0 | – | 0.1 | 2.0 | Multiplier for scaling the current setting value for OC2 |
| ResCrvType_OC2 | Instantaneous IEC Reset ANSI reset |
– | – | Instantaneous | Selection of reset curve type for OC2 |
| tResetDef_OC2 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay used in IEC Definite Time curve OC2 |
| P_OC2 | 0.001 – 10.000 | – | 0.001 | 0.020 | Parameter P for customer programmable curve for OC2 |
| A_OC2 | 0.000 – 999.000 | – | 0.001 | 0.140 | Parameter A for customer programmable curve for OC2 |
| B_OC2 | 0.000 – 99.000 | – | 0.001 | 0.000 | Parameter B for customer programmable curve for OC2 |
| C_OC2 | 0.000 – 1.000 | – | 0.001 | 1.000 | Parameter C for customer programmable curve for OC2 |
| PR_OC2 | 0.005 – 3.000 | – | 0.001 | 0.500 | Parameter PR for customer programmable curve for OC2 |
| TR_OC2 | 0.005 – 600.000 | – | 0.001 | 13.500 | Parameter TR for customer programmable curve for OC2 |
| CR_OC2 | 0.1 – 10.0 | – | 0.1 | 1.0 | Parameter CR for customer programmable curve for OC2 |
| tResetDef_UC2 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay used in IEC Definite Time curve UC2 |
| ResCrvType_OV1 | Instantaneous Frozen timer Linearly decreased |
– | – | Instantaneous | Selection of reset curve type for OV1 |
| tResetDef_OV1 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for definite time use of OV1 |
| tResetIDMT_OV1 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for IDMT curves for OV1 |
| A_OV1 | 0.005 – 999.000 | – | 0.001 | 0.140 | Parameter A for customer programmable curve for OV1 |
| B_OV1 | 0.500 – 99.000 | – | 0.001 | 1.000 | Parameter B for customer programmable curve for OV1 |
| C_OV1 | 0.000 – 1.000 | – | 0.001 | 1.000 | Parameter C for customer programmable curve for OV1 |
| D_OV1 | 0.000 – 10.000 | – | 0.001 | 0.000 | Parameter D for customer programmable curve for OV1 |
| P_OV1 | 0.001 – 10.000 | – | 0.001 | 0.020 | Parameter P for customer programmable curve for OV1 |
| ResCrvType_OV2 | Instantaneous Frozen timer Linearly decreased |
– | – | Instantaneous | Selection of reset curve type for OV2 |
| tResetDef_OV2 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for definite time use of OV2 |
| tResetIDMT_OV2 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for IDMT curves for OV2 |
| A_OV2 | 0.005 – 999.000 | – | 0.001 | 0.140 | Parameter A for customer programmable curve for OV2 |
| B_OV2 | 0.500 – 99.000 | – | 0.001 | 1.000 | Parameter B for customer programmable curve for OV2 |
| C_OV2 | 0.000 – 1.000 | – | 0.001 | 1.000 | Parameter C for customer programmable curve for OV2 |
| D_OV2 | 0.000 – 10.000 | – | 0.001 | 0.000 | Parameter D for customer programmable curve for OV2 |
| P_OV2 | 0.001 – 10.000 | – | 0.001 | 0.020 | Parameter P for customer programmable curve for OV2 |
| ResCrvType_UV1 | Instantaneous Frozen timer Linearly decreased |
– | – | Instantaneous | Selection of reset curve type for UV1 |
| tResetDef_UV1 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for definite time use of UV1 |
| tResetIDMT_UV1 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for IDMT curves for UV1 |
| A_UV1 | 0.005 – 999.000 | – | 0.001 | 0.140 | Parameter A for customer programmable curve for UV1 |
| B_UV1 | 0.500 – 99.000 | – | 0.001 | 1.000 | Parameter B for customer programmable curve for UV1 |
| C_UV1 | 0.000 – 1.000 | – | 0.001 | 1.000 | Parameter C for customer programmable curve for UV1 |
| D_UV1 | 0.000 – 10.000 | – | 0.001 | 0.000 | Parameter D for customer programmable curve for UV1 |
| P_UV1 | 0.001 – 10.000 | – | 0.001 | 0.020 | Parameter P for customer programmable curve for UV1 |
| ResCrvType_UV2 | Instantaneous Frozen timer Linearly decreased |
– | – | Instantaneous | Selection of reset curve type for UV2 |
| tResetDef_UV2 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for definite time use of UV2 |
| tResetIDMT_UV2 | 0.00 – 6000.00 | s | 0.01 | 0.00 | Reset time delay in sec for IDMT curves for UV2 |
| A_UV2 | 0.005 – 999.000 | – | 0.001 | 0.140 | Parameter A for customer programmable curve for UV2 |
| B_UV2 | 0.500 – 99.000 | – | 0.001 | 1.000 | Parameter B for customer programmable curve for UV2 |
| C_UV2 | 0.000 – 1.000 | – | 0.001 | 1.000 | Parameter C for customer programmable curve for UV2 |
| D_UV2 | 0.000 – 10.000 | – | 0.001 | 0.000 | Parameter D for customer programmable curve for UV2 |
| P_UV2 | 0.001 – 10.000 | – | 0.001 | 0.020 | Parameter P for customer programmable curve for UV2 |
CVGAPC Non group settings (basic)
| CVGAPC 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 |
CVGAPC Monitored data
| CVGAPC Monitored data | ||||
| Name | Type | Values (Range) | Unit | Description |
| DIROC1 | INTEGER | 1=Forward 0=Non- directional 2=Reverse |
– | Directional mode of OC1 (nondir, forward,reverse) |
| DIROC2 | INTEGER | 1=Forward 0=Non- directional 2=Reverse |
– | Directional mode of OC2 (nondir, forward,reverse) |
| CURRENT | REAL | – | A | Measured current value |
| ICOSFI | REAL | – | A | Measured current multiplied with cos (Phi) |
| VOLTAGE | REAL | – | kV | Measured voltage value |
| UIANGLE | REAL | – | deg | Angle between voltage and current |
Current selection for CVGAPC function
| Row No. | Set value for the parameter CurrentInput | Comment |
| 1 | Phase1 | CVGAPC function will measure the phase L1 current phasor |
| 2 | Phase2 | CVGAPC function will measure the phase L2 current phasor |
| 3 | Phase3 | CVGAPC function will measure the phase L3 current phasor |
| 4 | PosSeq | CVGAPC function will measure internally calculated positive sequence current phasor |
| 5 | NegSeq | CVGAPC function will measure internally calculated negative sequence current phasor |
| 6 | 3ZeroSeq | CVGAPC function will measure internally calculated zero sequence current phasor multiplied by factor 3 |
| 7 | MaxPh | CVGAPC function will measure current phasor of the phase with maximum magnitude |
| 8 | MinPh | CVGAPC function will measure current phasor of the phase with minimum magnitude |
| 9 | UnbalancePh | CVGAPC function will measure magnitude of unbalance current, which is internally calculated as the algebraic magnitude difference between the current phasor of the phase with maximum magnitude and current phasor of the phase with minimum magnitude. Phase angle will be set to 0° all the time |
| 10 | Phase1-Phase2 | CVGAPC function will measure the current phasor internally calculated as the vector difference between the phase L1 current phasor and phase L2 current phasor (IL1-IL2) |
| 11 | Phase2-Phase3 | CVGAPC function will measure the current phasor internally calculated as the vector difference between the phase L2 current phasor and phase L3 current phasor (IL2-IL3) |
| 12 | Phase3-Phase1 | CVGAPC function will measure the current phasor internally calculated as the vector difference between the phase L3 current phasor and phase L1 current phasor ( IL3-IL1) |
| 13 | MaxPh-Ph | CVGAPC function will measure ph-ph current phasor with the maximum magnitude |
| 14 | MinPh-Ph | CVGAPC function will measure ph-ph current phasor with the minimum magnitude |
| 15 | UnbalancePh-Ph | CVGAPC function will measure magnitude of unbalance current, which is internally calculated as the algebraic magnitude difference between the ph-ph current phasor with maximum magnitude and ph-ph current phasor with minimum magnitude. Phase angle will be set to 0° all the time |
Voltage selection for CVGAPC function
| Row No. | Set value for the parameter VoltageInput |
Comment |
| 1 | Phase1 | CVGAPC function will measure the phase L1 voltage phasor |
| 2 | Phase2 | CVGAPC function will measure the phase L2 voltage phasor |
| 3 | Phase3 | CVGAPC function will measure the phase L3 voltage phasor |
| 4 | PosSeq | CVGAPC function will measure internally calculated positive sequence voltage phasor |
| 5 | -NegSeq | CVGAPC function will measure internally calculated negative sequence voltage phasor. This voltage phasor will be intentionally rotated for 180° in order to enable easier settings for the directional feature when used. |
| 6 | -3ZeroSeq | CVGAPC function will measure internally calculated zero sequence voltage phasor multiplied by factor 3. This voltage phasor will be intentionally rotated for 180° in order to enable easier settings for the directional feature when used. |
| 7 | MaxPh | CVGAPC function will measure voltage phasor of the phase with maximum magnitude |
| 8 | MinPh | CVGAPC function will measure voltage phasor of the phase with minimum magnitude |
| 9 | UnbalancePh | CVGAPC function will measure magnitude of unbalance voltage, which is internally calculated as the algebraic magnitude difference between the voltage phasor of the phase with maximum magnitude and voltage phasor of the phase with minimum magnitude. Phase angle will be set to 0° all the time |
| 10 | Phase1-Phase2 | CVGAPC function will measure the voltage phasor internally calculated as the vector difference between the phase L1 voltage phasor and phase L2 voltage phasor (UL1-UL2) |
| 11 | Phase2-Phase3 | CVGAPC function will measure the voltage phasor internally calculated as the vector difference between the phase L2 voltage phasor and phase L3 voltage phasor (UL2-UL3) |
| 12 | Phase3-Phase1 | CVGAPC function will measure the voltage phasor internally calculated as the vector difference between the phase L3 voltage phasor and phase L1 voltage phasor ( UL3-UL1) |
| 13 | MaxPh-Ph | CVGAPC function will measure ph-ph voltage phasor with the maximum magnitude |
| 14 | MinPh-Ph | CVGAPC function will measure ph-ph voltage phasor with the minimum magnitude |
| 15 | UnbalancePh-Ph | CVGAPC function will measure magnitude of unbalance voltage, which is internally calculated as the algebraic magnitude difference between the ph-ph voltage phasor with maximum magnitude and ph-ph voltage phasor with minimum magnitude. Phase angle will be set to 0° all the time |
Restraint current selection for CVGAPC function
| Row No. | Set value for the parameter RestrCurr | Comment |
| 1 | PosSeq | CVGAPC function will measure internally calculated positive sequence current phasor |
| 2 | NegSeq | CVGAPC function will measure internally calculated negative sequence current phasor |
| 3 | 3ZeroSeq | CVGAPC function will measure internally calculated zero sequence current phasor multiplied by factor 3 |
| 4 | MaxPh | CVGAPC function will measure current phasor of the phase with maximum magnitude |
Typical current and voltage choices for directional feature
| Set value for the parameter CurrentInput |
Set value for the parameter VoltageInput |
Comment |
| PosSeq | PosSeq | Directional positive sequence overcurrent function is obtained. Typical setting for RCADir is from 45° to 90° depending on the power system voltage level (X/R ratio) |
| NegSeq | -NegSeq | Directional negative sequence overcurrent function is obtained. Typical setting for RCADir is from 45° to 90° depending on the power system voltage level (X/R ratio) |
| 3ZeroSeq | -3ZeroSeq | Directional zero sequence overcurrent function is obtained. Typical setting for RCADir is from 0° to 90° depending on the power system earthing (that is, solidly earthed, earthed via resistor) |
| Phase1 | Phase2-Phase3 | Directional overcurrent function for the first phase is obtained. Typical setting for RCADir is +30° or +45° |
| Phase2 | Phase3-Phase1 | Directional overcurrent function for the second phase is obtained. Typical setting for RCADir is +30° or +45° |
| Phase3 | Phase1-Phase2 | Directional overcurrent function for the third phase is obtained. Typical setting for RCADir is +30° or +45° |
Logics & highlights
I & U directional operating principle for CVGAPC function
CVGAPC, IcosPhi&U directional operating principle
Example for OC1 step current pickup level variation as function of measured voltage magnitude in Slope mode of operation
Example for OC1 step current pickup level variation as function of measured voltage magnitude in Step mode of operation
Current pickup variation with restraint current magnitude
CVGAPC function main logic diagram for built-in protection elements
Simplified internal logic diagram for built-in first overcurrent step that is, OC1 (step OC2 has the same internal logic)
Simplified internal logic diagram for built-in first undercurrent step that is, UC1 (step UC2 has the same internal logic)
Simplified internal logic diagram for built-in first overvoltage step OV1 (step OV2 has the same internal logic)
Simplified internal logic diagram for built-in first undervoltage step UV1 (step UV2 has the same internal logic)
