Overview
Undervoltages can occur in the power system during faults or abnormal conditions. The “Two step undervoltage protection (UV2PTUV)” function can be used to open circuit breakers to prepare for system restoration at power outages or as a long-time delayed back-up to the primary protection.
For more detailed information on “Two step undervoltage protection (UV2PTUV)” function, 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 |
| Two step undervoltage protection | UV2PTUV | 3U< | 27 |
Signals & Setting Parameters
UV2PTUV function block
UV2PTUV Input signals
| UV2PTUV Input signals | |||
| Name | Type | Default | Description |
| U3P | GROUP SIGNAL | – | Three phase voltages |
| BLOCK | BOOLEAN | 0 | Block of function |
| BLKTR1 | BOOLEAN | 0 | Block of operate signal, step 1 |
| BLKST1 | BOOLEAN | 0 | Block of step 1 |
| BLKTR2 | BOOLEAN | 0 | Block of operate signal, step 2 |
| BLKST2 | BOOLEAN | 0 | Block of step 2 |
UV2PTUV Output signals
| UV2PTUV Output signals | |||
| Name | Type | Description | |
| TRIP | BOOLEAN | Trip | |
| TR1 | BOOLEAN | Common trip signal from step1 | |
| TR1L1 | BOOLEAN | Trip signal from step1 phase L1 | |
| TR1L2 | BOOLEAN | Trip signal from step1 phase L2 | |
| TR1L3 | BOOLEAN | Trip signal from step1 phase L3 | |
| TR2 | BOOLEAN | Common trip signal from step2 | |
| TR2L1 | BOOLEAN | Trip signal from step2 phase L1 | |
| TR2L2 | BOOLEAN | Trip signal from step2 phase L2 | |
| TR2L3 | BOOLEAN | Trip signal from step2 phase L3 | |
| START | BOOLEAN | General start signal | |
| ST1 | BOOLEAN | Common start signal from step1 | |
| ST1L1 | BOOLEAN | Start signal from step1 phase L1 | |
| ST1L2 | BOOLEAN | Start signal from step1 phase L2 | |
| ST1L3 | BOOLEAN | Start signal from step1 phase L3 | |
| ST2 | BOOLEAN | Common start signal from step2 | |
| ST2L1 | BOOLEAN | Start signal from step2 phase L1 | |
| ST2L2 | BOOLEAN | Start signal from step2 phase L2 | |
| ST2L3 | BOOLEAN | Start signal from step2 phase L3 | |
UV2PTUV Group settings (basic)
| UV2PTUV Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off / On |
| OperationStep1 | Off On |
– | – | On | Enable execution of step 1 |
| Characterist1 | Definite time Inverse curve A Inverse curve B Prog. inv. curve |
– | – | Definite time | Selection of time delay curve type for step 1 |
| OpMode1 | 1 out of 3 2 out of 3 3 out of 3 |
– | – | 1 out of 3 | Number of phases required for op (1 of 3, 2 of 3, 3 of 3) from step 1 |
| U1< | 1.0 – 100.0 | %UB | 0.1 | 70.0 | Voltage setting/start val (DT & IDMT) in % of UBase, step 1 |
| t1 | 0.00 – 6000.00 | s | 0.01 | 5.00 | Definitive time delay of step 1 |
| t1Min | 0.000 – 60.000 | s | 0.001 | 5.000 | Minimum operate time for inverse curves for step 1 |
| k1 | 0.05 – 1.10 | – | 0.01 | 0.05 | Time multiplier for the inverse time delay for step 1 |
| IntBlkSel1 | Off Block of trip Block all |
– | – | Off | Internal (low level) blocking mode, step 1 |
| IntBlkStVal1 | 1 – 50 | %UB | 1 | 20 | Voltage setting for internal blocking
in % of UBase, step 1 |
| tBlkUV1 | 0.000 – 60.000 | s | 0.001 | 0.000 | Time delay of internal (low level) blocking for step 1 |
| HystAbs1 | 0.0 – 50.0 | %UB | 0.1 | 0.5 | Absolute hysteresis in % of UBase, step 1 |
| OperationStep2 | Off On |
– | – | On | Enable execution of step 2 |
| Characterist2 | Definite time Inverse curve A Inverse curve B Prog. inv. curve |
– | – | Definite time | Selection of time delay curve type for step 2 |
| OpMode2 | 1 out of 3 2 out of 3 3 out of 3 |
– | – | 1 out of 3 | Number of phases required for op (1 of 3, 2 of 3, 3 of 3) from step 2 |
| U2< | 1.0 – 100.0 | %UB | 0.1 | 50.0 | Voltage setting/start val (DT & IDMT) in % of UBase, step 2 |
| t2 | 0.000 – 60.000 | s | 0.001 | 5.000 | Definitive time delay of step 2 |
| t2Min | 0.000 – 60.000 | s | 0.001 | 5.000 | Minimum operate time for inverse curves for step 2 |
| k2 | 0.05 – 1.10 | – | 0.01 | 0.05 | Time multiplier for the inverse time delay for step 2 |
| IntBlkSel2 | Off Block of trip Block all |
– | – | Off | Internal (low level) blocking mode, step 2 |
| IntBlkStVal2 | 1 – 50 | %UB | 1 | 20 | Voltage setting for internal blocking
in % of UBase, step 2 |
| tBlkUV2 | 0.000 – 60.000 | s | 0.001 | 0.000 | Time delay of internal (low level) blocking for step 2 |
| HystAbs2 | 0.0 – 50.0 | %UB | 0.1 | 0.5 | Absolute hysteresis in % of UBase, step 2 |
UV2PTUV Group settings (advanced)
| UV2PTUV Group settings (advanced) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| tReset1 | 0.000 – 60.000 | s | 0.001 | 0.025 | Reset time delay used in IEC Definite Time curve step 1 |
| ResetTypeCrv1 | Instantaneous Frozen timer Linearly decreased |
– | – | Instantaneous | Selection of used IDMT reset curve type for step 1 |
| tIReset1 | 0.000 – 60.000 | s | 0.001 | 0.025 | Time delay in IDMT reset (s), step 1 |
| ACrv1 | 0.005 – 200.000 | – | 0.001 | 1.000 | Parameter A for customer programmable curve for step 1 |
| BCrv1 | 0.50 – 100.00 | – | 0.01 | 1.00 | Parameter B for customer programmable curve for step 1 |
| CCrv1 | 0.0 – 1.0 | – | 0.1 | 0.0 | Parameter C for customer programmable curve for step 1 |
| DCrv1 | 0.000 – 60.000 | – | 0.001 | 0.000 | Parameter D for customer programmable curve for step 1 |
| PCrv1 | 0.000 – 3.000 | – | 0.001 | 1.000 | Parameter P for customer programmable curve for step 1 |
| CrvSat1 | 0 – 100 | % | 1 | 0 | Tuning param for prog. under voltage IDMT curve, step 1 |
| tReset2 | 0.000 – 60.000 | s | 0.001 | 0.025 | Reset time delay used in IEC Definite Time curve step 2 |
| ResetTypeCrv2 | Instantaneous Frozen timer Linearly decreased |
– | – | Instantaneous | Selection of used IDMT reset curve type for step 2 |
| tIReset2 | 0.000 – 60.000 | s | 0.001 | 0.025 | Time delay in IDMT reset (s), step 2 |
| ACrv2 | 0.005 – 200.000 | – | 0.001 | 1.000 | Parameter A for customer programmable curve for step 2 |
| BCrv2 | 0.50 – 100.00 | – | 0.01 | 1.00 | Parameter B for customer programmable curve for step 2 |
| CCrv2 | 0.0 – 1.0 | – | 0.1 | 0.0 | Parameter C for customer programmable curve for step 2 |
| DCrv2 | 0.000 – 60.000 | – | 0.001 | 0.000 | Parameter D for customer programmable curve for step 2 |
| PCrv2 | 0.000 – 3.000 | – | 0.001 | 1.000 | Parameter P for customer programmable curve for step 2 |
| CrvSat2 | 0 – 100 | % | 1 | 0 | Tuning param for prog. under voltage IDMT curve, step 2 |
UV2PTUV Non group settings (basic)
| UV2PTUV Non group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| ConnType | PhN DFT PhPh RMS PhN RMS PhPh DFT |
– | – | PhN DFT | Group selector for connection type |
| GlobalBaseSel | 1 – 12 | – | 1 | 1 | Selection of one of the Global Base Value groups |
UV2PTUV Monitored data
| UV2PTUV Monitored data | ||||
| Name | Type | Values (Range) | Unit | Description |
| UL1 | REAL | – | kV | Voltage in phase L1 |
| UL2 | REAL | – | kV | Voltage in phase L2 |
| UL3 | REAL | – | kV | Voltage in phase L3 |
Logics & highlights
Voltage used for the inverse time characteristic integration
Voltage profile not causing a reset of the START signal for step 1, and inverse time delay at different reset types
Voltage profile causing a reset of the START signal for step 1, and inverse time delay at different reset types
Logic diagram for step 1, DT operation
Example for Definite Time Delay stage1 reset
Example for Definite Time Delay stage1 operation
Blocking function
Schematic design of Two step undervoltage protection UV2PTUV
