Overview
The “Undercurrent protection” function detects the going current in a feeder after the opening of the infeed circuit breaker and the loss of loads. It detects and protects pumps from running idle.
For more detailed information on “Undercurrent protection” 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 Undercurrent protection function
| Addr. | Parameter | C | Setting Options | Default Setting |
| Stage 1 | ||||
| _:13051:1 | Stage 1:Mode | off on test |
off | |
| _:13051:2 | Stage 1:Operate & flt.rec. blocked | no yes |
no | |
| _:13051:103 | Stage 1:Activation | always active with CB closed |
with CB closed | |
| _:13051:8 | Stage 1:Method of measurement | fundamental comp. RMS value |
fundamental comp. | |
| _:13051:102 | Stage 1:Pickup mode | 1 out of 3 3 out of 3 |
3 out of 3 | |
| _:13051:3 | Stage 1:Threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 0.050 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 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 | ||
| _:13051:104 | Stage 1:Pickup delay | 0.00 s to 60.00 s | 0.00 s | |
| _:13051:6 | Stage 1:Operate delay | 0.00 s to 60.00 s | 0.50 s | |
Logic Diagrams & highlights
Logic Diagram of the Undercurrent Protection
