Harmonics Harmonics: Harmonics by definition are a steady state distortion of the fundamental frequency 60 Hz. Harmonic distortion of current occurs when sinusoidal voltage is applied to a non-linear load ex. The result is a distortion of the fundamental current waveform. This distortion occurs in integer multiples of the fundamental frequency 60 Hz. Voltage distortion, on the other hand, is generated indirectly as result of harmonic currents flowing through a distribution system.

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Harmonics Harmonics: Harmonics by definition are a steady state distortion of the fundamental frequency 60 Hz. Harmonic distortion of current occurs when sinusoidal voltage is applied to a non-linear load ex. The result is a distortion of the fundamental current waveform. This distortion occurs in integer multiples of the fundamental frequency 60 Hz. Voltage distortion, on the other hand, is generated indirectly as result of harmonic currents flowing through a distribution system.

It is important to note that the vast majority of harmonic currents found in a distribution system are odd-order harmonics 3rd, 5th, 7th, etc. Secondly, more often than not, the sources of the harmonic currents in a distribution system are the loads in operation within that facility. Triplen Harmonics — The triplen harmonics are defined as the odd multiples of the 3rd harmonic ex.

Triplen harmonics are of particular concern because they are zero sequence harmonics, unlike the fundamental, which is positive sequence. The consequence of this fact is that the magnitude of these currents on the 3 phases are additive in the neutral. This can lead to very large currents circulating in the neutral, and unless the neutral is sufficiently oversized this can present a fire hazard. These currents can also circulate in the transformer causing significant overheating there too.

Single-phase power supplies for equipment such as electronic ballasts and PCs are the most significant source of Triplen harmonics. Although the 5th harmonic is much more prevalent, both have a negative sequence. This means that when distorted voltage containing the 5th or 11th harmonic is applied to a 3-phase motor, it will attempt to drive the motor in reverse, creating a negative torque.

In order to compensate for this negative torque, the motor must draw additional fundamental current.

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A 3,degree Fahrenheit electric arc furnace prepares to receive a "charge" of scrap metal for conversion into steel Saturday at Severstal Columbus Photo by Carmen K. The 3-phase system is transformed into three single-phase systems that are much simpler to analyze. The method allows any unbalanced set of phase currents or voltages to be transformed into three balanced sets. The positive sequence set contains three sinusoids displaced from each other, with the normal A-B-C phase rotation e. The sinusoids of the negative-sequence set are also displaced , but have opposite phase rotation A-C-B, e. The sinusoids of the zero sequence are in phase with each other e.

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## What happens to the triplen harmonic currents when a three phase load is used?

Current harmonics[ edit ] In a normal alternating current power system, the current varies sinusoidally at a specific frequency, usually 50 Hz or 60 Hz hertz. When a linear electrical load is connected to the system, it draws a sinusoidal current at the same frequency as the voltage though usually not in phase with the voltage. Current harmonics are caused by non-linear loads. When a non-linear load, such as a rectifier is connected to the system, it draws a current that is not necessarily sinusoidal.

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## Harmonics (electrical power)

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