IEC EN 60076-11 Power Transformers - Part 11: Standard Test for Dry-Type Transformers

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC EN 60076-11 test. IEC EN 60076-11 applies to dry-type power transformers (including auto-transformers) with peak voltage ratings for equipment up to (inclusive) 72,5 kV and at least one winding operating greater than 1,1 kV.

This standard does not apply to:

• Gas-filled dry-type transformers where the gas is not air;
• Single-phase transformers rated less than 5 kVA;
• polyphase transformers rated less than 15 kVA;
• Instrument transformers;
• starter transformers;
• Testing of transformers;
• Traction transformers mounted on the wagon;
• Flameproof and mining transformers;
• Welding transformers;
• Voltage regulating transformers;
• Small power transformers where safety is of particular importance.

In the absence of IEC standards for the above-mentioned transformers or other special transformers, this document may be applied in whole or in part.

The main changes compared to the previous edition are as follows:

• Extending the coverage up to 72,5kV;
• Containment management in terms of performance;
• Management of dielectric and thermal properties with altitude;
• New climate classes to better adapt to customers' needs;
• Establishing the relationship between location and environment classes;
• Limitation at 1000kVA and more robust testing process for fire behavior classes;
• Introduction of seismic class;
• Recommendations for amorphous transformers.

Rated power refers to continuous loading. This is a reference value for guarantees and tests regarding load losses, temperature rises and short-circuit impedance.

The transformer shall have an assigned rated power for each winding which must be marked on the rating plate. Rated power refers to continuous loading. This is a reference value for guarantees and tests regarding load losses and temperature rises.

EUROLAB assists manufacturers with IEC EN 60076-11 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.