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, GBR.

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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.