IEEE C57.91-1995/Cor 1-2002

C57.91-1995/Cor 1-2002 is a corrigendum to the C57.91 power-system standard, providing an English-language correction set for a document used in Power, Energy and Industry Applications. It matters because even small editorial or technical corrections can affect interpretation of design, operating, and testing requirements for equipment and engineering practice. For organizations working with transformer-related ratings or thermal guidance, this update helps support more accurate reference and compliance work.

Overview of C57.91-1995/Cor 1-2002

This corrigendum is intended to amend and clarify the base C57.91-1995 standard, which is commonly associated with power engineering guidance for equipment performance and thermal considerations. In practical terms, C57.91-1995/Cor 1-2002 helps users rely on a corrected version of the technical text when applying requirements, reviewing specifications, or checking engineering calculations. For teams that depend on precise language in procurement or design documents, the corrected text can reduce ambiguity and improve consistency.

Typical use cases

C57.91-1995/Cor 1-2002 is typically used when consulting technical requirements for power equipment in utility, industrial, or large facility applications. It may support engineers, specifiers, and reviewers working with transformer-related documentation, operating limits, thermal assessment, or acceptance criteria. The corrigendum is also useful during standards-based procurement or internal compliance reviews, where the exact wording of the referenced document needs to be verified before design decisions, testing, or field implementation.

Why it matters

Using C57.91-1995/Cor 1-2002 helps reduce the risk of relying on an uncorrected standard text. In power and energy work, clear requirements are important for safe operation, design control, and consistent testing or rating interpretation. This is especially valuable when a project depends on a specific edition for specification, review, or contract reference. A corrigendum can also support better traceability in compliance records and help teams avoid errors caused by outdated wording.

• Corrigendum to the C57.91-1995 standard
• English-language technical reference
• Relevant to power and energy applications
• Supports corrected interpretation of requirements
• Useful for design, review, and compliance work