Power Quality in Electrical Systems - ISBN:0071510028

Power Quality in Electrical Systems

Date: 22 April 2011, 08:10

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Various health organizations have also shown an increased interest in stray magnetic and electric fields, resulting in guidelines on the levels of these fields. Since currents create magnetic fields, it is possible to lessen AC magnetic fields by reducing harmonic currents present in the line-voltage conductors. Harmonic pollution on a power line can be quantified by a measure known as total harmonic distortion or THD.1 High harmonic distortion can negatively impact a facility’s electric distribution system, and can generate excessive heat in motors, causing early failures. Heat also builds up in wire insulation causing breakdown and failure. Increased operating temperatures can affect other equipment as well, resulting in malfunctions and early failure. In addition, harmonics on the power line can prompt computers to restart and adversely affect other sensitive analog circuits.

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