1. Reminders
The structure of medium-voltage distribution networks differs from one distributor to another, but it is generally radial, as shown in the schematic diagram in figure 1. This figure also serves as a reminder of the vocabulary used in the rest of this document.
The network is protected by means of fuses and automatic devices located at the various levels defined in the diagram 1.
The protection plan can be defined as the set of theoretical and practical measures implemented to detect and eliminate faults likely to affect this network: it combines the principles of detection and automation, as well as their appropriate settings.
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Multiphase fault protection
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