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ABB UNS0869a-P 3BHB001337R0002 Original Board
To be more precise, a valid protection system must be able to:
• understand what has happened and where it has happened, discriminating
between situations that are anomalous but tolerable and faults within a given
zone of influence, avoiding unnecessary tripping and the consequent
unjustified disconnection of a sound part of the system;
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