User's guide
Generators and motors electrical protection systems

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D3775 V2 Article

User's guide


Generators and motors electrical protection systems

Author : Christophe SCHROEDER

Publication date: May 10, 2025 | Lire en français

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10. User's guide

The choice of a protection scheme for alternators or motors must take into account a number of parameters, including :

  • the role and importance of the machine within the plant of which it is a part (power generation unit, industrial plant, factory);

  • the cost of repair in the event of damage and the costs incurred (e.g. for immobilization of the associated industrial process), or even the cost of replacement with new equipment;

  • the compromise between achieving a good level of reliability for the protected machine and the risk of untimely operation (tripping) of a protection, a risk which increases with the number of protection functions implemented.

For example, in certain applications where continuity of service is essential, it may be acceptable...

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