IEEE C57.117-1986

IEEE C57.117-1986 is a technical standard for reporting failure data for power transformers and shunt reactors on electric utility power systems. It is relevant to utility engineering teams that track equipment reliability, compare field performance, and support maintenance planning. By defining a consistent way to record and report failures, IEEE C57.117-1986 helps improve the quality of outage analysis, fleet assessment, and procurement decisions for high-voltage power equipment.

About IEEE C57.117-1986

This standard focuses on failure data reporting rather than design or construction requirements. Its purpose is to make information about transformer and shunt reactor failures more consistent and useful across utility operations. In practice, that means aligning how incidents are described, categorized, and shared so that engineers can compare results over time and across assets. IEEE C57.117-1986 is especially useful where reliability studies depend on clear, comparable field data.

Where is IEEE C57.117-1986 used?

IEEE C57.117-1986 is used in electric utility environments that operate power transformers and shunt reactors as part of transmission and substation systems. It supports maintenance departments, reliability engineers, and asset management teams that need structured failure records for analysis and reporting. The standard is also relevant when utilities review in-service performance, investigate recurring issues, or prepare internal documentation tied to equipment condition and service history. IEEE C57.117-1986 helps keep those records aligned.

Importance in practice

In practice, the value of IEEE C57.117-1986 is consistency. When failure data is reported in a uniform way, utilities can better compare equipment behavior, identify trends, and reduce ambiguity in technical reviews. That can support more reliable maintenance planning, clearer procurement evaluation, and stronger risk management for critical grid assets. For organizations managing transformer and shunt reactor fleets, the standard helps turn field events into usable engineering data.

• Failure data reporting
• Power transformers
• Shunt reactors
• Utility reliability analysis
• Equipment performance records