Logic of the Advanced Stage
[lodocp31-141013, 1, en_US]
Figure 7-92
Logic Diagram of the Directional, Definite-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.
Direction determination itself works across stages (see section 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 l7.6.7.1 Description ). If no voltage measure-
Protection and Automation Functions
7.6 Directional Overcurrent Protection, Phases
670 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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