07-02-2013, 04:09 PM
IEEE Standard Definitions for Use in Reporting Electric Generating Unit Reliability, Availability, and Productivity
1 Definitions for Use .pdf (Size: 1.18 MB / Downloads: 21)
INTRODUCTION
Measures of generating unit performance have been defined, recorded, and utilized by the electric power
industry for over 60 years. The increased focus on generating unit performance in a competitive
marketplace has caused regulatory agencies and the industry to place a greater emphasis on performance
measures.
This standard was developed in 1987, based on efforts started in 1980, to provide terminology and indexes
for use in existing data systems or in future systems. The focus of this revision is on performance measures
to be used in a competitive marketplace.
Some indexes are based on period hours. By use of such a common base, simple additive relationships
between various indexes result, and the use of period hours gives sets of indexes that sum to 100%. Other
indexes are not based on period hours. This revision of the standard has included terms for units involved in
nonbase load operations. The IEEE 762 Working Group defined sufficient data categories (states, times,
capacity levels) so that suitable indexes for all types of units can be calculated.
It should be noted that even the use of all the indexes and terms cannot identify the underlying and
sometimes compelling reasons for lost performance.
Overview
Although a generating unit generally includes all equipment from the fuel supply system up to the highvoltage
terminals of the generator step-up transformer and the station service transformers, any event
preventing the ability of the generating unit to produce electricity at its maximum capacity is covered in the
scope of this standard. Sometimes, the generating unit cannot provide the power required to the customer
because of problems not related to the power plant equipment. Some examples of these “external events”
are transmission system failures, labor strikes, and catastrophic storms.
Scope
This document standardizes terminology and indexes for reporting electric generating unit reliability,
availability, and productivity performance measures while recognizing the power industry’s needs,
including marketplace competition. This standard also includes equations for equivalent demand forced
outage rate (EFORd), newly identified outage states, discussion of commercial availability, energy
weighted equations for group performance indexes, definitions of outside management control (OMC),
pooling methodologies, and time-based calculations for group performance indexes.
Purpose
This standard is intended to aid the electric power industry in reporting and evaluating electric generating
unit reliability, availability, and productivity. It was originally developed to overcome difficulties in the
interpretation of electric generating unit performance data from various systems and to facilitate
comparisons among different systems. The standard also makes possible the exchange of meaningful data
among systems in North America and throughout the world.
Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments or corrigenda) applies.