The IEC 60726 standard for dry-type power transformers was withdrawn and replaced by IEC 60076-11:2018, which provides current requirements for units up to 72.5 kV. Legacy copies of the 1982 standard can be acquired through technical document providers or reviewed in archived formats. Access the active, updated standard at IEC Webstore Public Resource IS 11171 (1985): Dry-Type Power Transformers
Key Scope of IEC 60726:
- Cooling methods (AN, AF, etc.)
- Temperature rise limits for insulation classes (B, F, H)
- Dielectric tests and insulation levels
- Short-circuit withstand capability
- Climatic, environmental, and fire behavior tests
If you're interested in learning more about solid piece transformers, I can try to provide more information or point you to resources that might help.
(and later updated by the 2018 edition). While legacy documents referencing IEC 60726 may still exist, current industry standards require compliance with the IEC 60076-11 series for design, rating, and testing of dry-type power transformers up to 72.5 kV. Svenska institutet för standarder, SIS Key Information on IEC 60726 & Replacements Withdrawn and superseded by IEC 60076-11. Scope (Original IEC 60726):
IEC 60726 is an international standard that outlines the requirements for dry-type power transformers. These transformers are used to transfer electrical energy from one circuit to another through electromagnetic induction, without the use of a liquid coolant. The standard covers the design, construction, testing, and safety requirements for dry-type power transformers, ensuring they operate efficiently and safely in various applications.
For historical or research purposes, you can find the original IEC 60726 (or its European equivalent EN 60726) through the following resources: Standards and Downloads
Defined how encapsulated windings (often using epoxy resin) should resist moisture, dust, and corrosion. Exclusions: