Electrical Testing of Dry-Type Transformers

By Mark Pustejovsky

"There are various construction methods for the manufacturing of dry-type transformers, and each type is suited for different environments and applications"

Dry-type transformers are a large part of the electrical infrastructure for many industrial and commercial sites. Therefore, ensuring the performance of electrical testing and maintenance on critical transformers is very important to electrical system reliability.

This article covers electrical testing and maintenance items recommended by the InterNational Electrical Testing Association (NETA) and other industry best practices for transformers above 500 kVA. NETA has two standards, one for acceptance testing of new units (ANSI/NETA ATS-2017, Standard for Acceptance Testing Specifications for Electrical Power Equipment & Systems) and one for maintenance testing of service-aged units, (ANSI/NETA MTS-2019, Standard for Maintenance Testing Specifications for Electrical Power Equipment & Systems).

We will focus on maintenance testing specifications in this article. Also, the recommended testing of dry-type transformers is very similar to liquid-filled transformers, with a few key differences.

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This article was originally published in the June 2019 issue of the The Dry-Type revolution magazine.

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