The main measure to reduce the loss is to use cold-rolled oriented silicon steel sheets as the core material. The silicon steel sheets have good performance and small unit loss. The core production process is improved and the core joints are pressed at 45°C, thus greatly reducing the losses. The load current is large and the iron core is not punched at the same time. The tape binding structure is adopted to improve the utilization rate of the iron core. The silicon steel sheets do not need to be painted. The insulating film of the silicon steel sheet itself is used to reduce the gap between the silicon steel sheets. Strictly avoid burrs when cutting the silicon steel sheets to make the core joints smooth and tight, thereby achieving the purpose of reducing no-load loss and no-load current. As the utilization rate of the iron core is improved, the volume of the iron core is reduced, and the number of coils is reduced, thereby reducing the load loss.
With the continuous improvement of low-voltage power transformer manufacturing processes, transformer performance parameter standards are constantly being refreshed. What is currently implemented is the newly released GB/T6451-2008 "Technical Parameters and Requirements for Oil-immersed Power Transformers", that is, the release of this technical standard, which announces the formal completion of the transition from S7 to S9 6, 10/kV distribution transformer technical standards After the implementation of the law, the production and sale of S7 and S8 were subsequently banned.
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