Logic of the Advanced Stage
[lodocp33-121013, 2, en_US]
Figure 6-52
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 6.6.7.1 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 6.6.7.1 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
6.6 Directional Overcurrent Protection, Phases
420 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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