IEC 60034-18-42:2017

Overview

IEC 60034-18-42:2017 is a key international standard published by the International Electrotechnical Commission (IEC) focusing on the qualification tests for partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines. These machines, including single and polyphase AC machines, are fed from voltage converters such as those operating with pulse width modulation (PWM). The document establishes essential criteria and test methods to ensure that insulation systems in stator and rotor windings can withstand repetitive impulse voltages and prevent partial discharge activity, thereby ensuring reliability and longevity under converter-fed conditions.

Key Topics

• Partial Discharge Resistant Insulation Systems (Type II): The standard defines insulation systems specifically designed to resist the effects of partial discharges caused by repetitive impulse voltages generated by voltage source converters.

• Voltage Stresses in Machine Windings: Detailed analysis of voltages stressing insulation at various points, including phase-to-phase, phase-to-ground, and turn-to-turn, tailored to both random-wound and form-wound winding designs.

• Electrical Qualification Tests: Specifies standardized electrical tests for mainwall insulation, turn insulation, and stress control systems using impulse voltage simulations reflecting converter operation conditions.

• Lifetime and Aging Assessment: Provides methodologies to evaluate and predict insulation system lifespan under converter-induced stress, including use of 50 Hz or 60 Hz life data to forecast performance in converter-fed scenarios.

• Impulse Voltage Insulation Classes (IVIC): Introduction of a classification system outlining reliability limits of insulation performance during service with converter drives.

• Test Specimen Preparation and Criteria: Defines requirements for specimen sampling, preparation, and pass/fail criteria for qualification to ensure consistency and repeatability in evaluating insulation systems.

Applications

IEC 60034-18-42:2017 is essential for manufacturers, designers, and testing laboratories involved in:

• Design and manufacturing of converter-fed rotating electrical machines: Including industrial motors, generators, and variable speed drives requiring enhanced insulation resistance to partial discharge.

• Qualification and verification of electrical insulating materials: Ensuring that insulation systems meet rigorous performance standards to prevent premature failure due to voltage impulses.

• Quality assurance in electric motor production: Providing benchmark tests to certify insulation systems against converter-induced electrical stresses in diverse operating environments.

• Research and development in insulation technology: Offering a structured testing framework to develop next-generation insulation systems with improved durability and reliability.

• Industrial sectors utilizing high-performance electric drives: Such as renewable energy, transportation (electric vehicles, trains), and automation, where converter-fed machines are prevalent.

Related Standards

Professionals working with IEC 60034-18-42:2017 should also consider the following standards to complement their understanding and implementation:

• IEC 60034 series: The broader set of standards covering rotating electrical machines, their performance, testing, and insulation systems.

• IEC 60034-18-31: Pertains to electrical insulation systems resistant to partial discharge under converter supply, focusing on different insulation types.

• IEC 60034-1: General requirements for rotating electrical machines, including ratings and testing protocols.

• IEC 61800 series: Standards covering adjustable speed electrical power drive systems, providing context for converter-fed machine applications.

• IEC 60243 and IEC 60664: Standards relating to electrical insulation coordination and testing methods for insulation in electrical equipment.

Keywords: IEC 60034-18-42, partial discharge resistant insulation, Type II insulation system, rotating electrical machines, voltage converters, pulse width modulation (PWM), electrical qualification tests, stator insulation, rotor insulation, impulse voltage, converter-fed machines, insulation lifetime, electrical stress testing, impulse voltage insulation class (IVIC).