7.20 Underfrequency Load Shedding...................................................................................... 834
7.20.1 Overview of Functions...............................................................................................834
7.20.2 Structure of the Function...........................................................................................834
7.20.3 General Functionality................................................................................................ 835
7.20.3.1 Description.......................................................................................................... 835
7.20.3.2 Application and Setting Notes.............................................................................. 838
7.20.4 Stage Description...................................................................................................... 841
7.20.4.1 Description.......................................................................................................... 841
7.20.4.2 Application and Setting Notes.............................................................................. 843
7.20.5 Settings.....................................................................................................................844
7.20.6 Information List.........................................................................................................844
7.21 Rate of Frequency Change Protection.............................................................................. 846
7.21.1 Overview of Functions .............................................................................................. 846
7.21.2 Structure of the Function...........................................................................................846
7.21.3 General Functions (Undervoltage Test, df/dt Calculation)........................................... 846
7.21.3.1 Description.......................................................................................................... 846
7.21.3.2 Application and Setting Notes.............................................................................. 847
7.21.4 Stage Description...................................................................................................... 848
7.21.4.1 Description.......................................................................................................... 848
7.21.4.2 Application and Setting Notes.............................................................................. 849
7.21.4.3 Settings............................................................................................................... 850
7.21.4.4 Information List................................................................................................... 850
7.22 Power Protection (P,Q), 3-Phase...................................................................................... 852
7.22.1 Overview of Functions .............................................................................................. 852
7.22.2 Structure of the Function .......................................................................................... 852
7.22.3 Active Power Stage ................................................................................................... 853
7.22.4 Reactive Power Stage ................................................................................................855
7.22.5 Application Example.................................................................................................. 856
7.22.6 Setting Notes for the Active Power Stage................................................................... 857
7.22.7 Setting Notes for the Reactive Power Stage................................................................ 858
7.22.8 Settings.....................................................................................................................859
7.22.9 Information List.........................................................................................................860
7.23 Phase-Sequence Switchover............................................................................................ 862
7.23.1 Overview of Functions...............................................................................................862
7.23.2 Structure of the Function .......................................................................................... 862
7.23.3 Function Description..................................................................................................862
7.23.4 Application and Setting Notes....................................................................................865
7.23.5 Settings.....................................................................................................................866
7.23.6 Information List.........................................................................................................867
7.24 Instantaneous Tripping at Switch onto Fault.................................................................... 868
7.24.1 Overview of Functions .............................................................................................. 868
7.24.2 Structure of the Function .......................................................................................... 868
7.24.3 Stage Description...................................................................................................... 869
7.24.4 Application and Setting Notes ................................................................................... 869
7.24.5 Settings.....................................................................................................................870
7.24.6 Information List.........................................................................................................870
7.25 Negative-Sequence Protection.........................................................................................871
7.25.1 Overview of Functions .............................................................................................. 871
Table of Contents
22 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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