[PDF] causes of harmonics

Harmonics are the result of nonlinear loads that convert AC line voltage to DC. Harmonics flow into the electrical system because of nonlinear electronic switching devices, such as variable frequency drives (VFDs), computer power supplies and energy-efficient lighting.
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  • What are the main causes of harmonics?

    Harmonics – frequency effects caused either by the power supply or by equipment operating within the system.
    Unbalance – the effect of voltage or current variations on each of the electrical phases.
    Flicker – effects caused by repetitive switching of electrical loads such as arc furnaces or other processes.

  • What are the causes of harmonic distortion?

    Harmonic distortions are usually caused by the use of nonlinear loads by the end users of electricity.
    Nonlinear loads, a vast majority of which are loads with power electronic devices, draw current in a nonsinusoidal manner.

  • What problems can harmonics cause?

    The following symptoms are examples of equipment failure and misoperation associated with harmonics on a power system:

    Overheating (motors, cables, transformers, neutrals)Motor vibrations.Audible noise in transformers and rotating machines.Nuisance circuit breaker operation.Electrical fires.Voltage notching.

  • What problems can harmonics cause?

    Third Order Harmonics
    This type of harmonics is generated in non-linear loads.
    Examples of nonlinear loads include transistors, electrical motors, and the non-ideal transformer.
    Nonlinear loads create disturbances in the fundamental harmonic, which produce all types of harmonics.

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