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FUNDAMENTALS OF HARMONICS

Presented by:

Syed Khundmir T

Department of EleUniversity at Buff

khundmir@buffa

The BEST Group

THE BUFFALO ENERGY SCIENCE AND TECHNOLOGY-Win

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Harmonic Distortion

It is caused by non-linear devices. In such devices, the current is not proportional to applied vo

Most of the times, only odd harmonics are present in the sys

Vast majority of nonlinearities in the system are foundelements ie., loads.

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Voltage vs Current Distortion

Non-linear loads appear to be the source of harmonic current ininjects harmonic currents into the power system. Voltage distortion is the result of distorted currents passing t

linear, series impedance of the power delivery system.

Harmonic currents passing through the impedance cause a voltaeach harmonic. This results in voltage harmonic appearing at the

While the load current harmonics result in voltage distortion, inoted that load has no control over voltage distortion.

The above mentioned phenomenon is shown in the figure presentslide:

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Contd

Control over harmonic currents takes place at the end-user ap Control over the voltage distortion, assuming the harmon

injection is within reasonable limit, is excercised by the entcontrol over the system impedance, which is often the utility

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