What are harmonics in the power grid? What are the causes of harmonics in the power grid? What is the calculation of total harmonic distortion THD? Mundo da Elétrica using a Keysight oscilloscope with FFT function explains about harmonics in the power grid talking about fundamental frequencies and harmonics. The total harmonic distortion rate THD is an indicator of the quality of electrical power, the causes of voltage harmonics or current harmonics are basically electrical consumption of non-linear loads, such as cell phone chargers, electronic lamps, LED lamps, switching sources, etc. FFT stands for Fast Fourier Transform and is the mathematical calculation used to analyze harmonics in the power grid. Buy a Mundo da Elétrica shirt: https://goo.gl/3eOYKy Keysight DSOX1102G 100MHz Digital Oscilloscope: Used to measure and sample harmonics in the power grid through the FFT function. Learn more: https://goo.gl/50cddB Among the objectives of this video, we highlight: What harmonics are in the electrical grid. What harmonics cause and what they imply in the electrical grid. We address the following items throughout this video: Harmonics are frequencies that are integer multiples of a fundamental frequency! Harmonic frequencies harm the quality of electrical energy and can cause several problems, such as overloading the neutral conductor, low performance and reduced useful life of motors, capacitors and several other electrical and electronic components. These harmonic frequencies are caused by non-linear consumption equipment in the electrical grid, such as electronic lamps, cell phone chargers, dimmers and several other electronic devices. Harmonics are one of the parameters present in total harmonic distortion or THD, which is a metric for electrical energy quality. Some measuring devices are used to measure the amount of harmonics in the electrical network, such as power analyzers and an oscilloscope that has the FFT (Fast Fourier Transform) function. It is also possible to measure and see the harmonic frequencies present in an electrical network. FFT is the fast Fourier transform, which is a mathematical algorithm that calculates the discrete Fourier transform. It changes the domain of a signal from time to frequency. Highlighted parts in this video (edit notes): 00:29 - Frequency is the basis for understanding harmonics in the electrical network. After all, harmonics are frequencies that are multiples of the fundamental frequency. 01:37 - A frequency inverter changes the waveform and can therefore change the frequency of a circuit to, for example, vary the speed of an electric motor. 02:29 - One of the consequences of frequency harmonics is the possibility of overloading the neutral conductor. 02:44 - The active and inactive duty cycle of a load that works with switching causes the load consumption to be non-linear and causes harmonic frequencies. 03:48 - An oscilloscope that has an FFT function can show the harmonics of an electrical network. Other videos that complement this subject:???? What is electrical frequency? ▶️ • What is electrical frequency? What is Duty Cycle! ▶️ • What is Duty Cycle! Oscilloscope: why should you have one? ▶️ • Oscilloscope: why should you have one? Participating in this video: Alex Teixeira Benfica https://goo.gl/QI0Pil Video editing: Bruno Almeida Pereira (Morgado) #MEL_00515 -- The World of Electricity is an electricity, electrical and electronics channel with quality videos for you to learn on your cell phone, tablet or on your living room TV. Electricity for everyone! Electrical command course, online electrical classes, PDF manuals, electrical diagrams and explanations about NR 10 and other concepts! Join Mundo da Elétrica: On Youtube (click and subscribe): http://goo.gl/vXru8M Mundo da Elétrica website: http://www.mundodaeletrica.com.br On the Telegram channel: https://telegram.me/mundodaeletrica On Facebook: /mundodaeletrica On Google Plus: https://plus.google.com/+MundoDaEletrica On Twitter: /mundodaeletrica On Linkedin: https://goo.gl/S8lcwp