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Protection and Automation Functions
6.6 Directional Overcurrent Protection, Phases
Logic of the Advanced Stage
[lodocp33-121013, 2, en_US]
Figure 6-52
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
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
ments which can be used to determine the direction are available in the voltage memory, the basic stage
420
Logic Diagram of the Directional, Inverse-Time Overcurrent Protection, Phases - Advanced
6.6.7.1 Description
).
6.6.7.1 Description
). If no voltage measure-
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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