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<p>Testing of transformers in Transmission and Distribution networks is crucial because they are likely to experience multiple system faults during their operational lifetime. As a result, it is important to conduct comprehensive tests on these transformers to ensure their design efficiency and overall condition. The IEC 60076–5 standard stipulates that the short circuit (SC) capability of a transformer can be demonstrated through calculation, design considerations, and testing conducted in an accredited Laboratory. This study presents an experimental approach to evaluate the feasibility of the approach used to carry out the SC withstand capability of large power transformer. The current study examines the general requirements for transformer short-circuit strength and the equipment used to evaluate the best feasible method to carry out the dynamic short-circuit test successfully under the grid supply. Additionally, the detail verification of the transformer’s test results regarding its ability to withstand short circuits. The findings indicate that the high-capacity auto transformer was able to withstand High Voltage–Medium Voltage and Medium Voltage–Low Voltage short circuit conditions, demonstrating that the 500&#xa0;MVA 400&#xa0;kV 3-phase transformer has robust resilience against short circuits across various dynamic conditions.</p>

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Verifying the feasibility of dynamic short-circuit resilience of power transformer under grid supply: an experimental approach

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Narendra Kotta,
  • Jayaram Nakka

摘要

Testing of transformers in Transmission and Distribution networks is crucial because they are likely to experience multiple system faults during their operational lifetime. As a result, it is important to conduct comprehensive tests on these transformers to ensure their design efficiency and overall condition. The IEC 60076–5 standard stipulates that the short circuit (SC) capability of a transformer can be demonstrated through calculation, design considerations, and testing conducted in an accredited Laboratory. This study presents an experimental approach to evaluate the feasibility of the approach used to carry out the SC withstand capability of large power transformer. The current study examines the general requirements for transformer short-circuit strength and the equipment used to evaluate the best feasible method to carry out the dynamic short-circuit test successfully under the grid supply. Additionally, the detail verification of the transformer’s test results regarding its ability to withstand short circuits. The findings indicate that the high-capacity auto transformer was able to withstand High Voltage–Medium Voltage and Medium Voltage–Low Voltage short circuit conditions, demonstrating that the 500 MVA 400 kV 3-phase transformer has robust resilience against short circuits across various dynamic conditions.