Investigation of the thermal impact of stray losses at the high-current LV exit region on the transformer tank wall in GSU transformers – Part I
In this study, stray losses occurring on the tank surface due to leakage flux at the LV exit region of a 730 MVA GSU transformer are investigated under three different design scenarios.
by Arda Kızıldeli, İrem Hazar, Necmettin Mert Koçanalı, Emre Kervan, Mahmut Aksoy
In high-power Generator Step-Up (GSU) transformers, the high currents carried in the low-voltage (LV) exit region generate intense leakage magnetic flux, which induces stray losses on the tank wall and structural components. Even when total load losses remain within acceptable limits, local stray loss density in compact designs may lead to significant temperature rise and long-term thermal reliability risks.
In this study, stray losses occurring on the tank surface due to leakage flux at the LV exit region of a 730 MVA GSU transformer are investigated under three different design scenarios. The results show that, without altering the compact structural configuration, appropriate material selection and magnetic shunt modification can significantly reduce local loss density and improve thermal performance.
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