Overview
The “Rate of frequency change protection” function is used to detect a frequency change quickly, and prevent the system from not secure states caused by unbalance between the generated and consumed active power. It is also used for network decoupling and load shedding.
For more detailed information on “Rate of frequency change 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 Rate of frequency change protection function
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:13171:101 | General:Minimum voltage | 3.000 V to 175.000 V | 37.500 V | |
| _:13171:137 | General:Measuring window | 2 periods to 5 periods | 5 periods | |
| df/dt falling1 | ||||
| _:13231:1 | df/dt falling1:Mode | off on test |
off | |
| _:13231:2 | df/dt falling1:Operate & flt.rec. blocked | no yes |
no | |
| _:13231:3 | df/dt falling1:Threshold | 0.100 Hz/s to 20.000 Hz/s | 3.000 Hz/s | |
| _:13231:4 | df/dt falling1:Dropout differential | 0.02 Hz/s to 0.99 Hz/s | 0.10 Hz/s | |
| _:13231:6 | df/dt falling1:Operate delay | 0.00 s to 60.00 s | 1.00 s | |
| df/dt rising1 | ||||
| _:13201:1 | df/dt rising1:Mode | off on test |
off | |
| _:13201:2 | df/dt rising1:Operate & flt.rec. blocked | no yes |
no | |
| _:13201:3 | df/dt rising1:Threshold | 0.100 Hz/s to 20.000 Hz/s | 3.000 Hz/s | |
| _:13201:4 | df/dt rising1:Dropout differential | 0.02 Hz/s to 0.99 Hz/s | 0.10 Hz/s | |
| _:13201:6 | df/dt rising1:Operate delay | 0.00 s to 60.00 s | 1.00 s | |
Logic Diagrams & highlights
Logic Diagram of General Functionality
Logic Diagram of Rate of Frequency Change Protection
