Overview
The function “Overvoltage protection with negative or positive sequence voltage” is used to monitor the power system and electric machines for voltage unbalances and establish a release criterion of overcurrent protection for unbalanced faults Voltage.
For more detailed information on “Overvoltage protection with negative or positive sequence voltage” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Setting Parameters
General Setting parameters
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:10 | General:Blk. by meas.- volt. failure | no yes |
yes | |
| _:2311:102 | General:Measuring window | 1 cycles to 10 cycles | 1 cycles | |
| _:2311:101 | General:Minimum voltage V1 | 0.300 V to 60.000 V | 5.000 V | |
Setting parameters for Stage with Negative-Sequence Voltage/Positive-Sequence Voltage
| Addr. | Parameter | C | Setting Options | Default Setting |
| Stage 1 | ||||
| _:17071:1 | Stage 1:Mode | off on test |
off | |
| _:17071:2 | Stage 1:Operate & flt.rec. blocked | no yes |
no | |
| _:17071:3 | Stage 1:Threshold | 0.50 % to 100.00 % | 10.00 % | |
| _:17071:4 | Stage 1:Dropout ratio | 0.90 to 0.99 | 0.95 | |
| _:17071:6 | Stage 1:Operate delay | 0.00 s to 60.00 s | 3.00 s | |
| Stage 2 | ||||
| _:17072:1 | Stage 2:Mode | off on test |
off | |
| _:17072:2 | Stage 2:Operate & flt.rec. blocked | no yes |
no | |
| _:17072:3 | Stage 2:Threshold | 0.50 % to 100.00 % | 15.00 % | |
| _:17072:4 | Stage 2:Dropout ratio | 0.90 to 0.99 | 0.95 | |
| _:17072:6 | Stage 2:Operate delay | 0.00 s to 60.00 s | 0.50 s | |
Logic Diagrams & highlights
Logic Diagram of the General Functionality
Logic Diagram of the Stage: Overvoltage Protection with Negative-Sequence Voltage/Positive-Sequence Voltage
Voltage Phasors during a 2-Phase Local Fault
Linking the Pickup of the Negative-Sequence Voltage Stage
