COMO SÃO CONSTRUÍDOS OS NÚCLEOS DOS TRANSFORMADORES - EP01

🎁 Products we recommend: 🔗 https://meli.la/2njVbpU __________________________________________________ Automate your electrical calculations with our spreadsheets: Link to purchase the Electrical Calculation Spreadsheet: https://hotm.art/ytd-planilha-calculo... Link to purchase the Load Schedule Calculation Spreadsheet: https://hotm.art/ytd-planilha-quadro-... Link to purchase the Electrical Plant Sizing Spreadsheet: https://hotm.art/ytd-planilha-plantas... __________ If you like the Eletricity channel and want to contribute to the generation of quality content, then access one of the options below: PIX KEY 👉 [email protected] QR CODE 👉 https://bit.ly/doacao-pix __________________________________________________ Receive content from Eletricity directly in your email! Register through the link below: 🔗 https://bit.ly/cadastro-eletricity __________________________________________________ Before starting our description, I would like to thank our partners and leave their contact information below for anyone interested in learning more about them: 👉 https://meshengenharia.com/ __________________________________________________ 👇 Check out our content 👇 🔌 https://linktr.ee/Eletricity __________________________________________________ The series was filmed at the facilities of HC Transformadores, which has specialized in the purchase, sale, repair, and rental of low and medium voltage transformers since 1976. We would also like to thank the Director of HC, Mr. Álvaro, and Marcinho, who has extensive knowledge of all the processes and was available for equipment handling and support during filming. We also want to express our gratitude to Luiz Rocha and Hilton Rocha from @MeshEngenharia. Today, starting our series, we'll talk about the core, an extremely important component in a transformer. Basically, transformers consist of two windings, primary and secondary, surrounded by a core that can be made of magnetic or non-magnetic material. When one winding is energized with an alternating current, the electromagnetic field generated by the flow of this current in the coil induces an electrical voltage in the other coil. The vast majority of cores are manufactured with magnetic materials. The function of the core is to concentrate the magnetic field, for a given current, and to orient this field so that almost all the magnetic flux created by the primary coil also passes through the secondary coil, reducing energy losses in the voltage transformation. For the transformers we know, the presence of the iron core also mitigates the currents in the coils; for example, a coil without an iron core has low impedance, generating currents similar to a short circuit for the transformer's power supply. It's important to clarify that air can also be used as a core, but it wouldn't have the same efficiency as an iron core. The most commonly used material in core manufacturing is an iron-silicon alloy. But is an iron core manufactured as a single block? The answer is NO. Throughout the iron core, eddy currents known as Foucault currents are induced due to induced electromotive forces, as the magnetic flux is varying. However, these currents are reduced by using a LAMINATED core, consisting of sheets of ferromagnetic material electrically isolated from each other. If the core were solid, we would have longer paths for the induced currents. Being laminated, the paths for eddy currents are reduced, avoiding losses in the transformer. However, there will always be losses of electromagnetic energy in the core and consequently its heating. A technique that can improve the efficiency of a core is related to the quality and manner in which the material is used in its construction. Basically, there are two models: • GO (Grain Oriented) sheets: have higher magnetic permeability, generating a better response in terms of efficiency, but at a slightly higher cost. • GNO (Grain Non-Oriented) sheets: these have a lower magnetic response, but have gained significant market share due to their improved magnetic response over the years. Their cost is much lower compared to GO sheets. Basically, oriented grains better direct the magnetic flux, contributing to reduced losses. Non-oriented grains, i.e., dispersed grains, give the core a lower magnetic response. Another technique that can improve magnetic efficiency is related to the type of core assembly. So? Did you like the first video in our series about transformers? Until next time!!! 💡 Pay attention to #electricity 💡 Participate, leave your comment below. 👇 👇 👇