Journal
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
Volume 121, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijepes.2020.106153
Keywords
Dynamic loading capability; Hot-spot temperature; Heat accumulative effect; Thermal modelling; Transformer
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Funding
- Research Grants Council of the HKSAR Government [R5020-18]
- Innovation and Technology Commission of the HKSAR Government [K-BBY1]
- National Natural Science Foundation of China [51877072]
- Huxiang Young Talents programme of Hunan Province [2019RS2018]
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The lifetime cycle and secured service of buried transformers are constrained by their thermal insulation and loading conditions. This paper proposes an extended thermal circuit model for direct-buried transformer substations to dynamically evaluate the transformer loading capability. In the proposed model, the underground thermal interactions and energy balances among heat generation, transfer and storage in the transformer substation are represented with nonlinear thermal resistances and capacitances based on thermal-electrical analogies, and then hot-spot temperature (HST) dynamics can be captured from the nodal analysis on this R-C thermal equivalent circuit. Furthermore, the underground thermal accumulative effect is investigated for dynamic loading capability assessment considering the combined impact of heat accumulation in the surrounding soil caused by fluctuating transformer loads during prior operating periods. Finally, the finite element analysis with measured data is implemented for parameter tuning and model verification of the proposed thermodynamic model, and numerical simulations confirm the improvements of the proposed model for the transformer life extension and load management.
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