H

hardware: In computer usage, the physical components of the computer system, such as circuits, cabinets, racks, and tape readers, as contrasted with software.
hard-wired: Applied to equipment that connects its power source with wiring (generally customer- or contractor-supplied) attached directly to terminal blocks or distribution panels rather than via an input line cord and output receptacle.
harmonic: A sinusoidal wave, such as ac voltage, current, or power, that has a frequency equal to an integral multiple of the fundamental frequency.
harmonic content: The waveform that remains after subtracting the fundamental component from a harmonic waveform.
harmonic distortion: Waveform changes caused by the power supplies of certain electrical or electronic appliances. Periodic distortion of the sine wave. See distortion and total harmonic distortion (THD). Regularly appearing distortion of the sine wave whose frequency is a multiple of the fundamental frequency. Converts the normal sine wave into a complex waveform.
harmonic filter: On power systems, a device for filtering one or more harmonics from the power system. Most are passive combinations of inductance, capacitance, and resistance. Newer technologies include active filters that can also address reactive power needs.
harmonic neutralization: A process to cancel harmonics at the output of a circuit by inverting them and feeding them back in their opposite phase.
harmonic number: The whole number that equals the ratio of the frequency of a harmonic to the fundamental frequency.
harmonic resonance: The power quality term that describes the condition that sometimes occurs in electrical systems in which high currents...

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Power Quality Primer

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