This month’s Featured Technical Paper is from the Proceedings of the 2017 International Conference of Doble Clients. The paper is titled: Case Studies of Recent Transformer Site Repairs
The repair of a failed transformer on site including the installation of new windings can in certain situations provide a useful alternative compared to the more usual supply of a new transformer or factory repair. Transformer site repair is also more viable with the recent proven ability to perform full factory testing of transformers on site, including impulse test, and new technology to effectively dry power transformers on site. There are certain cases such as transportation constraints (i.e. removed rail or bridge access) or short time constraints that make the repair of a transformer on site worth considering. Presented are 2 recent cases of successful transformer site repairs done by New Brunswick Power in Canada. This paper will present the background and reasons for the site repair choice, an overview of the site repair execution and background technical information on the transformer site testing and transformer site drying using the Low Frequency Heating technology.
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