EN IEC 60034-18-32:2022/prA1:2025

Overview

EN IEC 60034-18-32:2022/prA1:2025 (Amendment 1) is an amendment to the IEC/CENELEC standard that defines electrical endurance qualification procedures for form-wound windings used in rotating electrical machines. This amendment focuses on the functional evaluation of insulation systems (Type II) and clarifies construction and preparation of test objects used in electrical endurance testing. The document is issued as a Committee Draft for Vote (CDV) and may be subject to change.

Key topics and technical requirements

• Test object construction (clause 5.1 amendment)
  • Test objects should preferably be complete bars or coils made using normal design, materials and manufacturing procedures.
  • Alternatively, test samples may replicate the finished winding configuration and be subjected to the full intended manufacturing process.
• Electrical stress and creepage control
  • When model bars or coils are used, creepage distances and any required voltage grading must be appropriate to the stress levels applied during testing.
  • Test bars must be designed to avoid flashover between the end of the stress-control coating and the conductor end.
  • For high-voltage or high-frequency tests, special measures-such as extending stress-control coating length-may be applied to reduce excessive surface stress and to enable reliable evaluation of the mainwall insulation.
• Ground electrode and slot models
  • A ground electrode should extend the full slot length of the model and cover at least the two wide sides of the coil cross-section.
  • Slot models for GVPI systems are required to be made from rigid steel plates, with a length comparable to the longest actual stator core length and without additional inserted components beyond those present in the actual system.

Practical applications and users

This amendment and the parent standard are directly relevant to:

• Manufacturers of rotor and stator windings and form-wound coils
• Insulation system designers and material suppliers
• Test laboratories and quality/qualification engineers performing electrical endurance testing
• Certification bodies assessing compliance of rotating electrical machines
• R&D teams developing insulation systems and assessing long-term electrical endurance

Using these procedures ensures consistent, repeatable endurance qualification that reflects real manufacturing processes and realistic electrical stresses.

Related standards

• EN IEC 60034-18-32:2022 (base standard) - this amendment provides targeted changes to test-object construction and related test practices.
• Other parts of the EN IEC 60034 series (rotating electrical machines) and insulation-system standards may be referenced for complementary test definitions and material classifications.

Keywords: rotating electrical machines, form-wound windings, insulation systems, electrical endurance, qualification procedures, test objects, stress control, GVPI.