Overview
The “Compensated over and undervoltage protection” function calculates the remote end voltage of the transmission line utilizing local measured voltage, current and with the help of transmission line parameters, that is, line resistance, reactance, capacitance and local shunt reactor. For protection of long transmission line for in zone faults, COUVGAPC can be incorporated with local criteria within direct transfer trip logic to ensure tripping of the line only under abnormal conditions.
For more detailed information on “Compensated over and undervoltage protection” 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 |
| Compensated over and undervoltage protection | COUVGAPC | – | 59_27 |
Signals & Setting Parameters
COUVGAPC function block
COUVGAPC Input signals
| COUVGAPC Input signals | |||
| Name | Type | Default | Description |
| I3P | GROUP SIGNAL | – | Group signal for current inputs |
| U3P | GROUP SIGNAL | – | Group signal for voltage inputs |
| BLOCK | BOOLEAN | 0 | Block of the function |
| BLKTR | BOOLEAN | 0 | Blocks all operate outputs |
| SWIPOS | BOOLEAN | 1 | Local shunt reactor connected or not |
COUVGAPC Output signals
| COUVGAPC Output signals | |||
| Name | Type | Description | |
| TRUV | BOOLEAN | Common trip signal for compensated under voltage | |
| TROV | BOOLEAN | Common trip signal for compensated over voltage | |
| TRUVL1 | BOOLEAN | Trip signal for compensated under voltage of phase 1 | |
| TRUVL2 | BOOLEAN | Trip signal for compensated under voltage of phase 2 | |
| TRUVL3 | BOOLEAN | Trip signal for compensated under voltage of phase 3 | |
| TROVL1 | BOOLEAN | Trip signal for compensated over voltage of phase 1 | |
| TROVL2 | BOOLEAN | Trip signal for compensated over voltage of phase 2 | |
| TROVL3 | BOOLEAN | Trip signal for compensated over voltage of phase 3 | |
| STUV | BOOLEAN | Common start signal for compensated under voltage | |
| STOV | BOOLEAN | Common start signal for compensated over voltage | |
| STUVL1 | BOOLEAN | Start signal for compensated under voltage of phase 1 | |
| STUVL2 | BOOLEAN | Start signal for compensated under voltage of phase 2 | |
| STUVL3 | BOOLEAN | Start signal for compensated under voltage of phase 3 | |
| STOVL1 | BOOLEAN | Start signal for compensated over voltage of phase 1 | |
| STOVL2 | BOOLEAN | Start signal for compensated over voltage of phase 2 | |
| STOVL3 | BOOLEAN | Start signal for compensated over voltage of phase 3 | |
COUVGAPC Group settings (basic)
| COUVGAPC Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off/On |
| OperationUV | Off On |
– | – | On | Operation compensated under voltage Off/On |
| U< | 1 – 100 | %UB | 1 | 70 | Compensated under voltage level in % of UBase |
| tUV | 0.000 – 60.000 | s | 0.001 | 1.000 | Time delay to trip under voltage |
| OperationOV | Off On |
– | – | On | Operation compensated over voltage Off/On |
| U> | 1 – 200 | %UB | 1 | 120 | Compensated over voltage level in % of UBase |
| tOV | 0.000 – 60.000 | s | 0.001 | 5.000 | Time delay to trip over voltage |
COUVGAPC Group settings (advanced)
| COUVGAPC Group settings (advanced) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| HystAbs | 0.0 – 50.0 | %UB | 0.1 | 0.5 | Hysteresis absolute for compensated over/under voltage in % of UBase |
COUVGAPC Non group settings (basic)
| COUVGAPC 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 |
| R1 | 0.01 – 3000.00 | Ohm | 0.01 | 5.00 | Positive sequence resistance per phase for the line in ohm |
| X1 | 0.01 – 3000.00 | Ohm | 0.01 | 40.00 | Positive sequence reactance per phase for the line in ohm |
| Xc | 1.00 – 10000.00 | Ohm | 0.01 | 1000.00 | Half of equivalent capacitive reactance per phase in ohm |
| EnShuntReactor | Off On |
– | – | On | Enable setting if shunt reactor connected in line |
| Xsh | 1.00 – 10000.00 | Ohm | 0.01 | 1500.00 | Per phase reactance of local Shunt Reactor in ohm |
COUVGAPC Monitored data
| COUVGAPC Monitored data | ||||
| Name | Type | Values (Range) | Unit | Description |
| CMPUL1 | REAL | – | kV | Compensated voltage of phase 1 |
| CMPUL2 | REAL | – | kV | Compensated voltage of phase 2 |
| CMPUL3 | REAL | – | kV | Compensated voltage of phase 3 |
Logics & highlights
Vector diagram for local end and remote end voltage at no power transfer conditions
Breaker status configured with IED
Logic diagram of Compensated over and undervoltage protection (COUVGAPC)
Calculations
COUVGAPC technical data
