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Temperature Rise Test Study on 10kv Distribution Transformers under Different Overload Currents

2023 International Conference on Advances in Electrical Engineering and Computer Applications (AEECA)(2023)

Power Science Research Institute of Guizhou Electric Power Grid Co.

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Abstract
This paper initially analyzed the assessment standards for distribution transformer overload capacity, the causes of overload issues, and the stipulations regarding overload capability. Following that, the characteristics of three methods for analyzing transformer overloads–static analysis, dynamic simulation, and actual measurement–were examined. Ultimately, an actual measurement method was chosen to conduct temperature rise tests on a 100kVA/10kV oil-immersed distribution transformer under different multiples of rated current. The relationship between insulation lifespan degradation and overload operation of distribution transformers was analyzed, with short, medium, and long-term mitigation measures suggested. Studying the temperature rise tests under different overload currents for the 10kV distribution transformer can help assess its ability to withstand thermal loads under abnormal working conditions, understand the equipment’s performance under different temperature rise conditions, and consequently enhance the reliability and stability of system operation.
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Key words
Distribution Transformer,Overload Current,Temperature Rise Test,Actual Measurement Method,Insulation Lifespan
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