Overview
The “Overvoltage protection with negative sequence voltage” function is used to monitor the power system and electric machines for voltage unbalances and establish a release criterion of overcurrent protection for unbalanced faults.
For more detailed information on “Overvoltage protection with negative 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 | |
| _:2311:101 | General:Measuring window | 1 cycles to 10 cycles | 1 cycles | |
Setting parameters for Stage with Negative-Sequence Voltage
| Addr. | Parameter | C | Setting Options | Default Setting |
| Stage 1 | ||||
| _:271:1 | Stage 1:Mode | off on test |
off | |
| _:271:2 | Stage 1:Operate & flt.rec. blocked | no yes |
no | |
| _:271:3 | Stage 1:Threshold | 0.300 V to 200.000 V | 5.800 V | |
| _:271:4 | Stage 1:Dropout ratio | 0.90 to 0.99 | 0.95 | |
| _:271:6 | Stage 1:Operate delay | 0.00 s to 60.00 s | 3.00 s | |
| Stage 2 | ||||
| _:272:1 | Stage 2:Mode | off on test |
off | |
| _:272:2 | Stage 2:Operate & flt.rec. blocked | no yes |
no | |
| _:272:3 | Stage 2:Threshold | 0.300 V to 200.000 V | 9.000 V | |
| _:272:4 | Stage 2:Dropout ratio | 0.90 to 0.99 | 0.95 | |
| _:272:6 | 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 “Overvoltage Protection with Negative-Sequence Voltage” stage
Voltage Phasors during a 2-Phase Local Fault
Linking the Pickup of the Negative-Sequence Voltage Stage
