What is it about?

In this paper, an analytical approach allowing the reliability assessment of digital protective relay has been presented. First, the different failure modes (common cause failures) have been discussed. Then, reliability modeling and evaluation has been developed in order to identify the points of weakness in digital relays.

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Why is it important?

The development of digital protective relays is considered as a real revolution in the field of power system protection. This is due to their wonderful features not available with older relay generations such as: multifunction, compactness, communication…etc. However, many experts have expressed their anxieties about the reliability of this kind of relays.


The measures that may be taken is to prevent CCFs and enhance the reliability.

Pr Hamid Bentarzi
Universite M'Hamed Bougara Boumerdes

Read the Original

This page is a summary of: Reliability assessment and improvement of digital protective relays, International Journal of Systems Assurance Engineering and Management, October 2014, Springer Science + Business Media,
DOI: 10.1007/s13198-014-0300-z.
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