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IEEE 859-1987 (R2008)

IEEE Standard Terms for Reporting and Analyzing Outage Occurrences and Outage States of Electrical Transmission Facilities

Reaffirmed 2008. This standard is intended to aid the electric power industry in reporting and analyzing outage occurrences of transmission facilities. Use of systematic, precise definitions, which is essential for meaningful exchange of data, is promoted. The outage definitions and indices are intended for use in system planning models, operations and maintenance planning, and system design. The definitions and indices may not be sufficiently detailed to cover the information required for equipment design.

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Institute of Electrical and Electronics Engineers [IEEE]


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