Harmonics諧波意思

"Harmonics" or "harmonic" refers to a component of an electrical signal that has a frequency that is an integer multiple of the fundamental frequency. In other words, harmonics are frequencies that occur at regular intervals above the fundamental frequency.

For example, if the fundamental frequency of an electrical signal is 50 Hz (which is the standard frequency for AC power in some countries), the first harmonic would be 100 Hz (2 times the fundamental), the second harmonic would be 150 Hz (3 times the fundamental), and so on.

Harmonics can be generated in electrical systems by non-linear loads, such as rectifiers, variable speed drives, and electric arc furnaces. These devices cause the current and voltage to be distorted from their ideal sinusoidal waveforms, resulting in the creation of harmonic components.

Harmonics can cause several issues in electrical systems, including increased heating in distribution equipment, increased losses in transformers and cables, and interference with communication systems. Therefore, it is important to manage harmonics through the use of filters and other mitigation techniques to ensure the safe and efficient operation of electrical systems.