IEC 60836:2015

Overview

IEC 60836:2015 is the internationally recognized standard published by the International Electrotechnical Commission (IEC) for unused silicone insulating liquids, specifying their use in transformers and other electrotechnical equipment. This standard covers the critical requirements, test methods, and classification of silicone liquids, ensuring they meet stringent performance and safety criteria when used as insulating and cooling media in electrical applications.

Silicone insulating liquids addressed by this standard play a vital role in extending the lifespan and safety profile of electrical apparatus by providing reliable dielectric insulation and thermal management. Compared to traditional mineral oils, silicone liquids offer advantages in terms of fire resistance, operational temperature range, and environmental compatibility.

Key Topics

• Scope of IEC 60836:2015:
  Defines specifications for unused, additive-free silicone liquids, primarily polydimethyl siloxane, for use in transformers and additional equipment such as cable accessories, capacitors, and electrical magnets.

• Test Methods:
  Details standardized procedures for:

  • Colour and appearance assessment
  • Density and kinematic viscosity
  • Flash point and fire point evaluation
  • Water content and acidity measurement
  • Dielectric properties (breakdown voltage, dielectric dissipation factor, permittivity, and resistivity)

• Classification Updates:

  • Incorporates updates to liquid classifications in line with IEC 61039:2008.
  • Removes classification references to IEC 61100, which has been withdrawn.
  • Adds minimum requirements for other silicone liquids used in various electrotechnical purposes.

• Health, Safety, and Environment (HSE):
  Addresses proper handling, storage, disposal, and labelling. Silicone liquids are noted for low toxicity and environmental impact, but proper procedures remain essential for safe use.

• General Delivery and Identification:
  Describes requirements for packaging, container labelling, and transport. Emphasizes traceability via batch numbers and compliance with relevant regional and international regulations.

Applications

Adoption of IEC 60836:2015 ensures high-quality insulating fluids for various electrical industries, offering benefits such as operational safety, reduced maintenance, and longer service life of equipment. Key applications include:

• Power Transformers:
  Silicone transformer liquids are widely used where high fire points and enhanced safety are required, including high-voltage substations, urban, and industrial installations.

• Cable Accessories and Capacitors:
  The high dielectric strength and thermal stability of silicone liquids make them ideal for insulating cable joints, terminations, and capacitor units.

• Electrical Magnets and Switchgear:
  Silicone fluids ensure effective cooling and insulation for specialized electrical magnets and high-performance switchgear, especially in demanding or high-temperature environments.

• Other Electrotechnical Devices:
  Flexible to various applications requiring reliable electrical insulation and fire safety.

Using lubricants and insulating fluids compliant with IEC 60836:2015 improves equipment reliability, minimizes fire risks, and aligns with best practices in worldwide power distribution and equipment maintenance.

Related Standards

For a comprehensive approach to insulating fluids and electrotechnical systems, IEC 60836:2015 should be used in conjunction with relevant standards, including:

• IEC 61039: Classification of insulating liquids
• IEC 60296: Specifications for unused mineral insulating oils
• IEC 60156: Determination of breakdown voltage
• IEC 60247: Measurement of dielectric dissipation factor and resistivity
• IEC 60944: Maintenance of silicone transformer liquids
• IEC 60475: Sampling methods for insulating liquids
• IEC 60814: Water determination in oil-impregnated materials
• ISO 2211 / ISO 2592 / ISO 2719: Methods for assessing physical and safety properties

By aligning with IEC 60836:2015, manufacturers and utilities can ensure the safety, efficiency, and sustainability of their electrical infrastructure. This standard is essential for anyone involved in the design, manufacturing, specification, or maintenance of electrical equipment using silicone insulating liquids.