The Power Transformer Subcommittee of the Institute of Electrical and Electronics Engineers, (IEEE), representing both manufactures and users, has established and documented standard transformer test procedures. These test procedures are described in the American National Standards Institute, (ANSI) Standard ANSI C57.12.90 for liquid filled transformers and C57.12.91 for dry type transformers. General requirements are documented in ANSI C57.12.00 and C57.12.01 respectively. Additional information is documented in the National Electrical Manufacturers' Association (NEMA) Standards Publication No. TR-1.
Following completion of the test program, Sunbelt Transformer provides a written report detailing the results of the tests. These test reports provide a baseline for the new transformer and should be retained as a reference for future routine maintenance tests, such as TTR and Doble insulation tests. Sunbelt Transformer ensures that measuring equipment is calibrated regularly to national traceable standard instruments.