Rotating electrical machines. Part 18-33. Functional evaluation of insulation systems. Test procedures for form-wound windings. Multifactor evaluation by endurance under simultaneous thermal and electrical stresses

This document outlines the procedures for evaluating the performance of insulation systems in rotating electrical machines, specifically focusing on wound rotor assemblies. It provides detailed methodologies for conducting tests under combined thermal and electrical stress conditions to assess the endurance and overall functionality of the insulation systems. The standard covers various aspects including test conditions, measurement techniques, and criteria for determining the suitability of insulation systems. It is applicable to a wide range of rotating machines and aims to ensure consistent and reliable evaluation methods. The content includes definitions, test procedures, and guidelines for interpreting test results. This standard is intended to support the development, manufacturing, and maintenance of electrical machines by establishing a common framework for insulation system assessment.