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The Effect of Harmonics on Current Transformers

The Effect of Harmonics on Current Transformers thumbnail
Harmonics are non-linear curent in an electrical system.

Electronics are widely used in order to increase the efficiency of power system components. This can create non-linear loads referred to as harmonics. These non-linear loads can cause heat issues in some electrical components, including transformers.

  1. Overheating in the Transformer

    • Harmonics can result in a heat increase in various parts of a transformer, including the windings, leads, oil and insulation. Leaked energy can take the form of eddy currents that can be transmitted to parts linked by flux and cause further overheating.

    Effects of Harmonics

    • Overheating from harmonics can result in a shortened service life for transformers as well as major problems for electrical systems. Fires from overheating in electrical components such as transformers have become more common due to harmonic waves. Overheating can also cause circuit breakers to trip. After a fire or other major event, the entire electrical system must be inspected.

    K-Factor

    • The amount of harmonic disturbance caused by a device is known as the K-Factor. The higher the K-Factor, the greater the harmonics. The devices that have the highest K-Factors are personal computers, computer terminals, mainframe computers and AC variable drives.

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