Overview
The “Overfrequency protection” function detects overfrequencies in electrical power systems or machines, monitors the frequency band and output failure indications, disconnects generating units when the power frequency is critical, and provides additional turbine protection if the speed limiter fails.
For more detailed information on “Overfrequency 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 Overfrequency protection Function
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:101 | General:Minimum voltage | 3.000 V to 175.000 V | 37.500 V | |
| _:2311:109 | General:Dropout differ- ential | 20 mHz to 2000 mHz | 20 mHz | |
| Stage 1 | ||||
| _:31:1 | Stage 1:Mode | off on test |
off | |
| _:31:2 | Stage 1:Operate & flt.rec. blocked | no yes |
no | |
| _:31:3 | Stage 1:Threshold | Overfrequency A | 40.00 Hz to 90.00 Hz | 51.50 Hz |
| Overfrequency B | 40.00 Hz to 70.00 Hz | |||
| _:31:6 | Stage 1:Operate delay | 0.00 s to 600.00 s | 10.00 s | |
| Stage 2 | ||||
| _:32:1 | Stage 2:Mode | off on test |
off | |
| _:32:2 | Stage 2:Operate & flt.rec. blocked | no yes |
no | |
| _:32:3 | Stage 2:Threshold | Overfrequency A | 40.00 Hz to 90.00 Hz | 54.00 Hz |
| Overfrequency B | 40.00 Hz to 70.00 Hz | |||
| _:32:6 | Stage 2:Operate delay | 0.00 s to 600.00 s | 5.00 s | |
Logic Diagrams & highlights
Logic Diagram of the Overfrequency Protection Stage
