Overview
The “Undervoltage protection with positive sequence voltage” function monitors the permissible voltage range, protects equipment (for example, plant components and machines) from damages caused by undervoltage. It also protects motors and generators from inadmissible operating states and a possible loss of stability in the event of voltage dips.
For more detailed information on “Undervoltage protection with 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
Setting parameters for Undervoltage protection with positive sequence voltage
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:104 | General:Current-flow criterion | off on |
on | |
| _:2311:101 | General:Threshold I> | 1 A @ 100 Irated | 0.030 A to 10.000 A | 0.050 A |
| 5 A @ 100 Irated | 0.15 A to 50.00 A | 0.25 A | ||
| 1 A @ 50 Irated | 0.030 A to 10.000 A | 0.050 A | ||
| 5 A @ 50 Irated | 0.15 A to 50.00 A | 0.25 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 0.050 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 0.250 A | ||
| Stage 1 | ||||
| _:481:1 | Stage 1:Mode | off on test |
off | |
| _:481:2 | Stage 1:Operate & flt.rec. blocked | no yes |
no | |
| _:481:10 | Stage 1:Blk. by meas.- volt. failure | no yes |
yes | |
| _:481:101 | Stage 1:Pickup delay | no yes |
no | |
| _:481:3 | Stage 1:Threshold | 0.300 V to 200.000V | 46.000V | |
| _:481:4 | Stage 1:Dropout ratio | 1.01 to 1.20 | 1.05 | |
| _:481:6 | Stage 1:Operate delay | 0.00 s to 60.00 s | 3.00 s | |
| Stage 2 | ||||
| _:482:1 | Stage 2:Mode | off on test |
off | |
| _:482:2 | Stage 2:Operate & flt.rec. blocked | no yes |
no | |
| _:482:10 | Stage 2:Blk. by meas.- volt. failure | no yes |
yes | |
| _:482:101 | Stage 2:Pickup delay | no yes |
no | |
| _:482:3 | Stage 2:Threshold | 0.300 V to 200.000 V | 40.000V | |
| _:482:4 | Stage 2:Dropout ratio | 1.01 to 1.20 | 1.05 | |
| _:482:6 | Stage 2:Operate delay | 0.00 s to 60.00 s | 0.50 s | |
Logic Diagrams & highlights
Logic Diagram of the Stage Undervoltage Protection with Positive-Sequence Voltage
