Transformer core is a critical component of a transformer, serving as the medium for magnetic flux, which is essential for voltage transformation. Made typically from laminated sheets of high-permeability silicon steel, the core minimizes energy losses due to eddy currents and hysteresis. The laminations, insulated from each other, reduce the formation of eddy currents, enhancing the transformer's efficiency. The core can be constructed in different shapes, primarily the shell type and core type. In a core-type transformer, the windings encircle the core, whereas in a shell-type transformer, the core encircles the windings. This distinction influences the transformer's performance and application. The core's design aims to provide a low reluctance path for the magnetic flux, thus ensuring minimal energy loss and efficient magnetic coupling between the primary and secondary windings. Furthermore, the core's material and design are crucial in determining the transformer's performance characteristics, including efficiency, capacity, and thermal stability. Advanced core materials like amorphous steel are sometimes used to further reduce losses. Proper core construction and material selection are essential for the reliable and efficient operation of transformers in power distribution and electrical equipment.
Taizhou Tianli Iron Core Manufacturing Co., Ltd. is China Main Transformer Core Suppliers and Electrical steel core factory, established in 2009, covering an area of 12 acres with a registered capital of 100.09 million RMB and a workforce of 210 employees including more than 40 with college degrees or higher. Since 2010, the company has successively introduced advanced domestic equipment: 4 sets of slitting lines including Xi'an Qiyuan's (SDRI) ZJX(05)-1000/50, ZJX(2005)-1250/80, SL-04-01 high-speed type, 16 sets of HJX(22)-400L, HJX(D262)-800L cut-to-length lines, and 2 sets of DZX(05)-180/800 automatic core stacking robots. Annual production capacity reaches 50,000 tons.
Since 2011, our company has passed the quality management system (GB/T19001-2008/ISO9001:2008), environmental management system (GB/T24001-2004/ISO14001:2004), occupational health and safety management system (GB/T28001-2011/OHSA18001:2007), energy management system and other certifications. The company won the honorary title of "Specialized and Innovative Little Giant Enterprise" at the municipal level in 2018. In 2019, it was awarded the title of "National High-tech Enterprise". In 2022, it won the honorary title of "Specialized and Innovative Little Giant Enterprise" at the national level.
According to the ranking of the transformer core industry, Tianli Iron Core ranks among the great in the national transformer core industry. In the past three years, our company's production capacity has increased by more than 40% annually, culminating in taxable sales of 500 million RMB in 2023. Our company has been recognized by the Jiangyan Economic Development Zone and included as a key enterprise within the Jiangsu Province Smart Grid Industry Special Alliance. This designation marks us as a pivotal base for the cultivation of smart grid electrical accessory industries, highlighting our significant role in the advancement of smart grid technologies.
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View MoreTransformer core heat dissipation method
The transformer core handles heat dissipation during operation through several key mechanisms:
Core Material Properties:
Thermal Conductivity: The choice of core material impacts how effectively heat is conducted away from the core. High-quality silicon steel or advanced materials like amorphous steel typically have better thermal conductivity, which helps in distributing heat more evenly.
Insulation: Laminations in the core are usually coated with insulating materials that can withstand high temperatures and prevent thermal degradation.
Core Design:
Lamination Thickness and Configuration: The thickness and arrangement of core laminations can affect heat dissipation. Thin laminations reduce eddy current losses, which in turn reduces heat generation.
Ventilation and Cooling Channels: Some transformer designs incorporate ventilation or cooling channels to enhance airflow and improve heat dissipation.
Transformer Cooling Systems:
Oil Cooling: Many transformers use oil as both an insulator and a coolant. The oil circulates through the core and windings, absorbing and transferring heat to the outer parts of the transformer where it can be dissipated.
Air Cooling: In air-cooled transformers, fans or natural convection help dissipate heat from the surface of the transformer.
Heat Dissipation Mechanisms:
Radiation and Convection: The surface of the transformer core radiates heat into the surrounding environment. Convection currents, whether natural or forced by fans, help carry away the heat.
Heat Sinks: Some designs include heat sinks or additional cooling elements attached to the core to enhance heat dissipation.
Thermal Management Practices:
Monitoring Systems: Many modern transformers are equipped with thermal monitoring systems that track temperature and ensure that the core does not exceed safe operating limits.
Maintenance: Regular maintenance ensures that cooling systems, such as oil levels and cooling fans, are functioning properly, preventing overheating.
Effective heat dissipation is crucial for maintaining the core’s performance and longevity, as excessive heat can lead to reduced efficiency, potential damage, and increased risk of failure.
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