# What are the effects of harmonics?

Harmonic is multiple of the fundamental frequency and it can be voltage and current in an electric power system are a result of non-linear electric loads. Harmonics in power systems result in increased heating in the equipment and conductors, misfiring in variable speed drives, and torque pulsations in motors.
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### What is the cause of harmonic distortion?

Voltage waveform distortion. Ohm's Law also helps explain another phenomenon: distorted voltage waveforms caused by distorted current waveforms. Each harmonic current in a facility's electrical distribution system will cause a voltage at the same harmonic to exist when the harmonic current flows into an impedance.
• #### What is the cause of harmonic distortion?

Voltage waveform distortion. Ohm's Law also helps explain another phenomenon: distorted voltage waveforms caused by distorted current waveforms. Each harmonic current in a facility's electrical distribution system will cause a voltage at the same harmonic to exist when the harmonic current flows into an impedance.
• #### What causes harmonics in the power system?

Harmonics are caused by non-linear loads, that is loads that draw a non- sinusoidal current from a sinusoidal voltage source. Some examples of harmonic producing loads are electric arc furnaces, static VAR compensators, inverters, DC converters, switch-mode power supplies, and AC or DC motor drives.
• #### What is welding distortion?

Distortion in a weld results from the expansion and contraction of the weld metal and adjacent base metal during the heating and cooling cycle of the welding process. Doing all welding on one side of a part will cause much more distortion than if the welds are alternated from one side to the other.

Updated: 2nd October 2019

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