HOOVER DAM GSU TRANSFORMER FAILURE AND REPAIR
This month’s Featured Technical Paper is from the Proceedings of the 2025 International Conference of Doble Clients. The paper is titled: Hoover Dam GSU Transformer Failure And Repair.
Abstract
U.S. Bureau of Reclamation, Hoover Dam experienced a high voltage bushing failure on a 135 MVA, 230kV generator step-up transformer in July 2022. The failure created a fire that resulted in immediate media coverage of the incident. This paper covers the technical aspects of the event, repair, and testing of the transformer. The pre-fault test history, post-fault test results, and event timeline are all discussed in detail. The nature of the failure and post-fault condition coupled with the unique logistical situation at Hoover Dam required that the transformer repair be done on site. The decision drivers for the repair methodology and technical approach to the repair demonstrated novel ways to overcome obstacles. Lastly, the repair validation and induced voltage testing of the transformer ensured it was ready to return to service.
Doble Service Agreement Clients
This and other technical papers and presentations are available in the MyDoble Resource Center - one of the many benefits available to you as a Doble Service Agreement Client. To get to the MyDoble Resource Center login click here. Not a member? Follow the sign-up process.