Application of dynamic transformer ratings to increase the reserve of primary substations for new load interconnection

Abstract

This paper presents new approach to determine power reserve of congested primary substations by taking into account the thermal modelling of power transformers. As novelty, the proposed approach considers the uncertainty of thermal model’s input parameters - annual ambient temperature variation and annual irregularity of new consumer’s load profile. The approach suggested ensures power transformers to continue operation within the acceptable thermal parameters when new consumers are interconnected for this reserve value. The proposed approach is evaluated for real primary substation, located at Tomsk, Russia. The results are compared with conventional approach for reserve determination.