IEC 61558-2-26:2013

Overview

IEC 61558-2-26:2013 is a critical international standard published by the International Electrotechnical Commission (IEC) focusing on the safety of transformers, power supply units, and switch mode power supply units designed for energy saving and other specialized applications. This part of the IEC 61558 series establishes particular safety requirements and testing protocols to ensure these devices safely adjust output voltage or other electrical characteristics in electrical installations without interruption.

Designed for both single-phase and three-phase equipment, IEC 61558-2-26:2013 applies to air-cooled transformers and power supply units (natural or forced ventilation) used for voltage stabilization and energy-efficient electrical supply systems. The standard complements the general safety requirements set forth in IEC 61558-1 and covers devices operating at rated supply voltages up to 1000 V AC and frequencies up to 500 Hz.

Key Topics

• Scope and Applicability
  Addresses transformers and power supply units tailored to energy-saving applications and other functions requiring precise adjustment of output voltage or electrical characteristics without power interruption.

• Safety Considerations
  Emphasizes electrical, thermal, and mechanical safety aspects, including protection against electric shock, mechanical strength, and resistance to environmental factors such as dust and moisture ingress.

• Voltage and Current Parameters
  Defines requirements related to output voltage stability under load, no-load voltage characteristics, short-circuit voltage, and current ratings to ensure consistent and safe performance.

• Testing Protocols
  Specifies particular tests to verify compliance, including dielectric strength, insulation resistance, temperature rise, short-circuit and overload protections, and routine production testing to maintain high safety standards throughout the product lifecycle.

• Marking and Documentation
  Details marking requirements for clear identification, including electrical ratings and safety instructions, aiding manufacturers and end-users in proper product application.

• Integration with Other IEC Standards
  IEC 61558-2-26:2013 is intended to be used alongside IEC 61558-1:2005 and references other parts of the IEC 61558 series covering specific transformer types (e.g., isolating, auto, variable, switch mode power supply units) to ensure comprehensive safety compliance.

Applications

IEC 61558-2-26:2013 plays a vital role in industries and settings where energy efficiency and electrical safety are paramount. Typical applications include:

• Lighting Systems
  Voltage stabilization transformers for indoor and outdoor lighting installations, improving energy consumption without compromising safety or performance.

• Industrial Electrical Installations
  Power supply units designed to regulate output voltage and optimize energy use in manufacturing and production environments.

• Renewable Energy Systems
  Transformers and power units that support energy-saving initiatives in sustainable energy setups by controlling voltage fluctuations and ensuring safe operation.

• Consumer and Commercial Electronics
  Switch mode power supplies and transformers used in devices and systems requiring precise voltage adjustments to enhance energy efficiency.

By ensuring stringent safety requirements, this standard assists manufacturers in designing products that comply with international safety norms, safeguards end-users, and promotes energy conservation.

Related Standards

IEC 61558-2-26:2013 is part of the broader IEC 61558 series focusing on the safety of transformers, reactors, power supply units, and combinations thereof. Related standards include:

• IEC 61558-1:2005 - General safety requirements for transformers and power supply units.
• IEC 61558-2-1 - Requirements for separating transformers.
• IEC 61558-2-4 - Requirements for isolating transformers.
• IEC 61558-2-6 - Requirements for safety isolating transformers.
• IEC 61558-2-13 - Auto transformers.
• IEC 61558-2-14 - Variable transformers.
• IEC 61558-2-16 - Switch mode power supply units and transformers.

These complementary standards enable a comprehensive safety framework for various transformer and power supply unit types, ensuring consistent international safety practices and facilitating easier product certification and market access.

Adopting IEC 61558-2-26:2013 supports manufacturers, testing organizations, and regulatory bodies in implementing effective safety measures for energy-saving transformers and power supply units, fostering energy efficiency alongside reliable electrical safety worldwide.