Application of System Reliability Indices in Electric Power System

Ganiyu Adedayo Ajenikoko, Ojerinde Adedapo Ibukunoluwa, Adenle Musibau Shittu, Ibitowa Michael, Yusuf Mukhtar


System reliability indices deal with the adequacy of overall system supply and indicates the system behaviour and response. The index express interruption statistics in terms of the customers which can be an individual, firm, or organization that purchases electric services at one location under one rate classification, contract or schedule. The system reliability indices include: System Average Interruption Frequency Index (SAIFI), System Average Interruption Duration Index (SAIDI), Customer Average Interruption Duration Index (CAIDI), Average Service Availability Index (ASAI), Average Service Unavailability Index (ASUI), Expected Energy Not Supplied (EENS) and Average Energy Not Supplied (AENS). These indices are used as performance evaluation for power system reliability assessment. This assessment helps in system planning for long and short terms. This study therefore focuses reviewed past study on application of SAIFI, SAIDI and CAIDI for system reliability assessment on electric power system. These indices imply how often an average customer experiences sustained interruption over a predefined time of year and they are most used reliability indices for power system.

Keywords: Reliability Indices, SAIDI, SAIFI, CAIDI, ASAI, ASUI, AENS, Reliability Assessment.

DOI: 10.7176/JETP/11-6-03

Publication date: November 30th 2021

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ISSN (Paper)2224-3232 ISSN (Online)2225-0573

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