We provide comprehensive testing and certification services for transformers, ensuring reliable performance, safety, and compliance with international standards to power your operations with confidence.
Transformers are essential to the generation, transmission, distribution, and conversion of electrical power. From conventional oil-immersed and dry-type transformers to emerging solid-state transformer technologies, Intertek provides comprehensive testing, inspection, and certification services that help manufacturers demonstrate safety, reliability, performance, and regulatory compliance for global markets.
We offer testing and certification for power transformers up to 1000 MVA and voltages up to 850 kV, helping you meet the most demanding project requirements and operational standards.
ETL Listing for Power Transformers
Utilities, EPCs, industrial facilities, data centers, and infrastructure owners increasingly require independent third-party certification to demonstrate product safety, quality, and ongoing compliance. Intertek's ETL Listing helps manufacturers meet these expectations while building confidence with customers, specifiers, and Authorities Having Jurisdiction (AHJs).
Founded in 1938, the ASTA team delivers both IEC Type Test Certification and equipment approval, with every project witnessed by an ASTA Observer. These experts ensure that testing is conducted in line with ASTA requirements and applicable standards, verifying the accuracy of test results. Certification of Type Testing provides independent, objective evidence of compliance for the equipment tested at a specific point in time.
The ETL Mark demonstrates compliance with relevant North American safety standards, including UL Standards, IEEE standards, and ANSI-approved requirements where applicable. It is recognized by AHJs across the United States and Canada, helping manufacturers access these critical markets with confidence.
Transformer Testing Services
Intertek provides comprehensive testing and certification services for conventional and advanced transformer technologies, including:
- Routine, Type, and Special Testing
- Dielectric withstand and insulation testing
- Temperature rise testing
- Lightning impulse testing
- Short-circuit withstand testing
- Partial discharge testing
- Load loss and no-load loss measurements
- Sound level testing
- Environmental and mechanical testing
- Performance and reliability evaluations
- ETL Listing and certification
- ASTA witnessed testing and certification
Products and Standards we support:
- Oil-immersed Power Transformers:
IEC 60076-1, IEC 60076-2, IEC 60076-3, IEC 60076-5, IEC 60076-10, IEEE C57.12.00, IEEE C57.12.90 - Dry-type Power Transformers:
IEC 60076-11, IEEE C57.12.01, IEEE C57.12.91 - Solid-State Transformers:
Evaluated to applicable UL, IEEE, ANSI, IEC, and other product-specific safety and performance requirements based on system architecture and intended application - Additional Transformer Technologies:
Distribution transformers, instrument transformers, medium-voltage transformers, converter-integrated transformer systems, custom transformer assemblies
We also provide additional testing services based on national standards and specific customer requirements, ensuring full compliance and peace of mind for every project.
Solid-State Transformer (SST) Testing and Certification
Solid-State Transformers (SSTs) are an advanced alternative to conventional transformers for applications requiring intelligent power conversion, bidirectional power flow, and seamless integration with renewable energy and energy storage systems. Unlike traditional electromagnetic transformers, SSTs combine power electronics, high-frequency isolation transformers, advanced digital controls, and wide-bandgap semiconductor technologies such as silicon carbide (SiC) and gallium nitride (GaN).
Because SSTs combine transformer technology with power electronics and digital controls, compliance requires evaluation across multiple disciplines. Intertek evaluates SSTs using applicable safety, power electronics, grid interconnection, EMC, and performance standards based on the system architecture and intended application, including:
- UL 1741
- IEEE 1547
- IEEE 1547.1
- IEC 62477-1
- IEC 61000 Series
- Other applicable UL, IEEE, ANSI, and IEC requirements
Comprehensive Evaluation for Complex Power Electronic Systems
Intertek provides comprehensive evaluation and certification services for Solid-State Transformers, including:
- Electrical safety
- Power electronics and converter system evaluation
- Functional safety
- Electromagnetic compatibility (EMC)
- Environmental and reliability testing
- Grid interoperability and power quality
- Thermal performance evaluations
- Cybersecurity considerations for connected power systems
Our multidisciplinary experts help manufacturers navigate evolving standards and demonstrate compliance for advanced transformer technologies, supporting faster certification, regulatory acceptance, and global market access.
