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Application of enhanced thermal ratings to primary substation transformers

Elders, Ian and Bell, Keith and Smith, Kevin and Collinson, Alan (2017) Application of enhanced thermal ratings to primary substation transformers. In: Proceedings of 24th International Conference and Exhibition on Electricity Distribution. IET, Stevenage.

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Abstract

The use of thermal modelling to increase the permissible load-carrying capability of distribution system transformers is attracting increasing interest. Many reported approaches calculate the rating of transformers in real-time in response to system conditions. In this paper, we describe an experiment to validate and tune the parameters of such a thermal model, and explain how the results have been used to inform the inclusion of model-based seasonal “enhanced” ratings in the network planning process.