ANSI IEEE C57.117-1986 PDF

Full title and description

ANSI/IEEE C57.117-1986 — IEEE Guide for Reporting Failure Data for Power Transformers and Shunt Reactors on Electric Utility Power Systems. The guide provides a recommended format and procedures for collection, reporting and preliminary statistical analysis of failure and reliability data for power transformers and shunt reactors used on electric utility systems.

Abstract

This guide addresses the reporting and statistical analysis of reliability and failure data for power transformers and shunt reactors used on electric utility power systems. It describes the types and applications of equipment covered, recommended data elements and formats for establishing databases, reporting conventions for failures and outages, and examples of useful reports and basic reliability estimation methods (appendix with mathematics). The guide is intended to improve consistency of data collection and to support cooperative efforts between users and manufacturers.

General information

• Status: Superseded (withdrawn by ANSI); historic IEEE guide.
• Publication date: IEEE Standards Board approval June 19, 1986; ANSI approval August 21, 1987; published April 1, 1988.
• Publisher: Institute of Electrical and Electronics Engineers (IEEE), adopted as an American National Standard (ANSI/IEEE).
• ICS / categories: Electrical engineering — Transformers and reactors (ICS 29.180).
• Edition / version: C57.117-1986 (original 1986 IEEE guide edition).
• Number of pages: 19 pages (concise guide/report format).

Scope

The guide covers reporting and statistical analysis of failure data for a broad range of transformer and reactor types used on electric utility power systems, including power transformers, autotransformers, regulating/phase-shifting transformers, shunt reactors, HVDC converter transformers, substation and unit transformers, auxiliary and grounding transformers. It specifies recommended data elements, reporting formats, and example reports to support reliability assessment and comparisons between users and manufacturers.

Key topics and requirements

• Definitions and classification of failure events and equipment types for consistent reporting.
• Recommended data elements and record formats for establishing a failure/operation database (nameplate, service, failure mode, corrective actions, and diagnostics).
• Procedures and conventions for reporting failures and outages to support statistical analysis.
• Example report types and tables useful to users and manufacturers (failure rates, MTBF/MTTR summaries, cause breakdowns).
• Basic reliability-estimation mathematics and an appendix illustrating estimation techniques for small data sets.
• Guidance to promote uniform nomenclature and cooperative data exchange between utilities and manufacturers.

Typical use and users

Utilities, transformer manufacturers, reliability engineers, asset managers, forensic investigators and standards committees use this guide as a basis for establishing consistent failure-reporting practices, constructing reliability databases, and performing preliminary statistical assessments of transformer and reactor performance in service. It is primarily aimed at electric utility power systems applications.

Related standards

ANSI/IEEE C57.117-1986 has been superseded by later IEEE guidance on failure investigation and reporting; the principal successor document is IEEE C57.125 (and its later revisions, including the 2015 revision), which consolidates guidance on failure investigation, documentation, analysis and reporting for power transformers and shunt reactors. Other related documents include the broader IEEE C57 series standards covering transformer design, testing and condition assessment (for example C57.12 family and C57.104).

Keywords

transformer failure reporting, shunt reactor, reliability data, failure statistics, power transformers, outage reporting, IEEE C57 series, ANSI/IEEE C57.117-1986.

FAQ

Q: What is this standard?

A: ANSI/IEEE C57.117-1986 is an IEEE guide that provided recommended formats and procedures for reporting failure and reliability data for power transformers and shunt reactors on electric utility power systems.

Q: What does it cover?

A: It covers the kinds of transformers and reactors to be reported, data elements and database structure, reporting conventions, example reports useful to users and manufacturers, and basic reliability-estimation methods (appendix).

Q: Who typically uses it?

A: Electric utilities, transformer manufacturers, reliability and asset-management engineers, and failure-investigation teams use the guide to standardize failure-data collection and preliminary analysis.

Q: Is it current or superseded?

A: The 1986 guide is superseded; IEEE later consolidated and updated failure-investigation and reporting guidance in documents such as IEEE C57.125 (with revisions culminating in the 2015 edition). The ANSI adoption of C57.117 was later withdrawn.

Q: Is it part of a series?

A: Yes — it is part of the IEEE C57 family of standards related to power transformers and reactors; it specifically addressed reporting and reliability data and was intended to complement other C57 standards on testing, design and condition assessment.

Q: What are the key keywords?

A: Transformer failure reporting, reliability data, shunt reactor, power transformer, outage reporting, failure analysis, IEEE C57.117-1986.