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In the power transmission system, transformer is the core equipment, and its performance is related to the stability and efficiency of power supply. As a key component of the transformer, the design of the core has a significant impact on its operational efficiency, temperature rise and life span. In the early days, transformers used solid iron cores, which had serious heat generation and energy consumption problems. With the development of technology, laminated iron core has become the mainstream choice to improve the performance of transformers because it can effectively suppress eddy current loss.

More than 90% of a transformer’s performance, energy consumption and service life depend on its core material. Unsuitable cores lead to inefficiency, overheating and breakdowns. This article covers core functions, common materials and selection tips to help you pick the best transformer core quickly.

Transformer core is the device’s core magnetic component, responsible for conducting alternating magnetic flux, ensuring efficient conversion of electrical energy, and reducing operating losses. Currently, the most commonly used cores in residential and industrial transformers fall into two main categories: E-type cores and C-type cores. Although both are made of silicon steel, they differ significantly in terms of structural design, manufacturing processes, performance characteristics, and application scenarios—these differences serve as key distinguishing factors in transformer design and selection. This article provides a comprehensive comparison of the advantages and disadvantages of these two core types to facilitate quick and accurate selection.