Link to purchase the Electrical Calculations Spreadsheet: https://hotm.art/ytd-planilha-calculo... Link to purchase the Load Panel 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 Eletricity content straight to your email! Register using the link below: 🔗 https://bit.ly/cadastro-eletricity __________________________________________________ 👇 Check out our content 👇 🔌 https://linktr.ee/Eletricity __________________________________________________ We recently received two videos from two subscribers here on the Eletricity channel showing strange behavior in a three-phase power supply with neutral. When measuring voltage between phases, everything seems ok, but when measuring between phases and neutral, we have a higher voltage compared to the others. Why does this happen? Do you want to know the answer? One of the videos was sent by Getúlio, a professor at IFTM Campus Paracatu. In the video recorded by Josemar de Barros, we clearly see the same voltage between the phases, but when measuring the voltage between neutral and phases, we find a higher value in one of them. The other video was sent by Jader Eletricista, a professional who shows his work on Instagram. I confess that the work he and his team develop is eye-catching. Jader also encountered the same situation. When measuring the voltage between phases, everything is fine, but when measuring between neutral and phases, we also have a higher value in one of the measurements. This is very common, especially in some regions of the state of São Paulo. This is a configuration known as Open Delta. After World War II, Brazil began to become an industrial economy and some utilities found themselves under pressure to deliver electricity to consumers who were increasing every day. The Open Delta system was created to meet these large demands more economically. It is more economical because it does not use as many coils as in a conventional system. The Open Delta system uses two single-phase transformers with the primary connected to medium voltage. Each of the primary phases is connected to H1 of each of the transformers. The H2 terminals are grounded. In the secondary, let's first imagine delta coils as we know them. We have phases A, B and C at the ends of the triangles and we would not have a neutral as in the case of a star connection. In the Open Delta, we do not have one of the coils, but it is still possible to obtain the voltage values ​​between phases. This is easy to see in the diagram. Note that we still have phases A, B and C even without the presence of one of the coils. To obtain the neutral, a point is derived from the central TAP of one of the coils and grounded. Now we have the possibility of using three-phase or single-phase loads even with one less coil in the secondary. But according to the diagram with the voltage values, we have a problem. Although we have the same voltage between the phases, we have a higher value between the neutral and one of the phases, popularly called the high phase, so connecting single-phase loads between the neutral and this phase is not recommended, as it can cause the equipment to burn out. Let's see what this system would look like in practice? That's right, we're going to create an Open Delta system so you can see how it's done. So? Did you know about the Open Delta system? Have you ever come across an installation with power supply in this way like Jader and Josemar? If so, how about leaving your story in the comments? See you next time! 💡 Tune in to #eletricity 💡 __________________________________________________ 👇 Most Watched Videos: We Threw a Hair Dryer in the Bathtub. What Happened? 🎥 • A HAIR DRYER IN THE BATH CAN DAMAGE... We Debunk the Myth of the Shower Not Compatible with IDR (DR). 🎥 • WE DEBUNCH THE MYTH OF THE INCOMPATIBLE SHOWER... What THEY DIDN'T TELL YOU about the 3-PIN SOCKET CONTROVERSY. 🎥 https://bit.ly/2JE4P07 Ground and Neutral, Together or Separate? Why Has No One Told You This Before? 🎥 • GROUND AND NEUTRAL, TOGETHER OR SEPARATE? W... How to Make a Curve and Unevenness in Electrical Conduit. 🎥 https://bit.ly/2ABlrk4 Do You Know All the Functions of the Wire Stripping Pliers? 🎥 https://bit.ly/2GD5Sun