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For the core winding design, we primarily select copper foil for the low-voltage windings, while the high-voltage coils are constructed with a multi-layer cylindrical configuration. Axial oil passages are strategically incorporated as required, ensuring a balanced ampere-turn distribution between the high and low voltage windings. This meticulous design not only contributes to superior mechanical strength and robust short-circuit withstand capability but also significantly enhances heat dissipation, resulting in a lower hot spot temperature rise within the coils.
To ensure reliability during transportation and stable operation on site, the core and windings are fastened independently. All fasteners use self-locking anti-loosening nuts, allowing the transformer to withstand the rigors of transportation without compromising its integrity, thus ensuring reliable operation of the transformer after it arrives on site without the need for core inspection.
Regarding insulation treatment, we employ advanced vapor phase drying and vacuum oil injection processes. These processes guarantee thorough drying of the insulation and effectively minimize the air bubble content within the transformer oil. Furthermore, the conservator is equipped with a capsule, creating a complete isolation barrier between the transformer oil and ambient air, thereby preventing oil degradation and moisture ingress. These comprehensive measures significantly extend the transformer's maintenance cycle, leading to substantial reductions in user maintenance costs.
Reference standard
GB 1094.1~2《general provisions of power transformers》
《temperature length of oil-immersed transformer》
GB 1094.3 《insulation level, Insulation test and external insulation air gap》
GB 1094.5 《capacity of electrical transformers to withstand short circuits》
GB/T 6451 《technical parameters and requirements of oil-immersed power transformer》
GB/T 15164 《load guide for oil-immersed power transformers》
GB2536 《transformer oil》
