IEC 60034-18-1:2022

Overview

IEC 60034-18-1:2022 - Rotating electrical machines - Part 18-1: Functional evaluation of insulation systems - General guidelines - provides high-level guidance for the qualification and functional evaluation of electrical insulation systems used in rotating electrical machines (within the scope of IEC 60034-1). Edition 3.0 (2022) replaces the 2010 edition and refocuses this part on general principles, while relocating procedural and detailed test methods to subsequent parts of the IEC 60034-18 series.

Key updates include guidance for windings electrically stressed by converter‑supply, a defined procedure for comparing reference and candidate insulation systems, introduction of qualification for different expected service life‑times, and evaluation of minor component or manufacturing changes. The standard also recognizes that thermal ageing does not always follow Arrhenius behaviour for complex insulation systems.

Key topics and requirements

• Scope and purpose: Framework for qualifying insulation systems for rotating machines rather than prescriptive test recipes.
• Functional evaluation approach: Emphasis on comparing a candidate system to a service‑proven reference system to assess suitability and endurance.
• Types of functional tests: General guidance for thermal, electrical, mechanical, environmental and multifactor tests (combined stresses).
• Converter-fed windings: Incorporates considerations introduced for electrical qualification of windings stressed by converters.
• Qualification concepts: Procedures for categorizing changes (minor component/manufacturing changes), and qualification for different expected lifetimes in service.
• Ageing considerations: Notes limitations of applying Arrhenius-based thermal ageing models to insulation systems and the need for service‑oriented evaluation.
• Reporting and comparison: Guidance on analysis, reporting and classification of test outcomes and on establishing acceptance criteria relative to reference systems.

Applications and who uses it

IEC 60034-18-1 is intended for:

• Motor and generator OEMs developing or modifying insulation systems.
• Design engineers selecting insulation for new rotating machines.
• Qualification and test laboratories establishing functional evaluation programs.
• Quality and certification bodies assessing changes to insulating systems and manufacturing processes.
• Utilities, industrial end users and R&D teams interested in life‑time performance and converter‑fed machine behaviour.

Practical uses include qualifying new insulation constructions, assessing component substitutions or manufacturing changes, and defining test strategies to validate expected service lifetimes.

Related standards

• IEC 60034-1 (Rating and performance)
• IEC 60034-18‑21 / -18‑22 / -18‑31 / -18‑32 / TS 60034-18‑33 / -18‑34 / -18‑41 / -18‑42 (detailed procedures)
• IEC 60216 (thermal endurance of materials)
• IEC 60085 (thermal evaluation and classes)
• IEC 60505 (ageing principles)
• IEC 62539 (statistical analysis of breakdown data)

Keywords: IEC 60034-18-1:2022, rotating electrical machines, insulation systems, functional evaluation, insulation qualification, converter-supply, thermal ageing, reference insulation system.