Table of Contents
What is meant by electrical harmonics?
Harmonics are a distortion of the normal electrical current waveform, generally transmitted by nonlinear loads. Switch-mode power supplies (SMPS), variable speed motors and drives, photocopiers, personal computers, laser printers, fax machines, battery chargers and UPSs are examples of nonlinear loads.
What are sub harmonic frequencies?
Subharmonic frequencies are frequencies below the fundamental frequency of an oscillator in a ratio of 1/n, with n a positive integer. For example, if the fundamental frequency of an oscillator is 440 Hz, sub-harmonics include 220 Hz ( 1⁄2), ~146.6 Hz ( 1⁄3) and 110 Hz ( 1⁄4).
What’s the definition of harmonics?
A harmonic is a wave or signal whose frequency is an integral (whole number) multiple of the frequency of the same reference signal or wave. This frequency is measured in hertz and is the frequency at which it contains most of the energy. It can also represent when the signal is defined to occur.
What are types of harmonics?
There are two types of harmonics and they are odd harmonics and even harmonics. Odd numbers such as 3, 5, 7, etc, are the odd harmonics while even numbers such as 2, 4, 6, etc, are the even harmonics.
What are the characteristics of a harmonic component?
Harmonics are defined as an unwanted higher frequency component that is an integer multiple of the fundamental frequency. Harmonics create a distortion in the fundamental waveform. Harmonics usually have a lower amplitude (volume) than the fundamental frequency. What is Amplitude?
What causes subharmonics in electrical circuits?
Sub-harmonics may be generated when a system is highly inductive (such as an arc furnace during startup) or if the power system also contains large capacitor banks for power factor correction or filtering. Such conditions produce slow oscillations that are relatively un-damped, resulting in voltage sags and light flicker.
What is the difference between fundamental frequency and harmonics?
Harmonics create a distortion in the fundamental waveform. Harmonics usually have a lower amplitude (volume) than the fundamental frequency. What is Amplitude? The maximum value (positive or negative) of an alternating quantity is known as its amplitude.
What are the effects of current harmonics on an electrical system?
The second major effect of the current harmonics on an electrical system is the creation of the voltage harmonics. Voltage harmonics are generated by the current harmonics which distort the voltage waveform. Current distortion interacts with the system impedance creating the voltage distortion.
https://www.youtube.com/watch?v=VsXXbBlazvM