Logic of the Advanced Stage
[lodocp33-121013, 2, en_US]
Figure 7-94
Logic Diagram of the Directional, Inverse-Time Overcurrent Protection, Phases - Advanced
Directional Mode (Basic and Advanced Stage)
You use the Directional mode parameter to define whether the stage works in a forward or reverse direc-
tion.
The direction determination works across stages (see chapter 7.6.7.1 Description ).
Non-Directional Pickup, Voltage Memory (Basic and Advanced Stage)
If a 3-phase close-up fault occurs, all 3 phase-to-ground voltages drop to almost 0. If this happens, direction
determination can fall back on a voltage memory (see chapter 7.6.7.1 Description ). If no voltage measure-
ments which can be used to determine the direction are available in the voltage memory, the basic stage
Protection and Automation Functions
7.6 Directional Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual 681
C53000-G5040-C015-9, Edition 11.2017
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