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3-15

CH 3/ View Real Time Data

Section C

Harmonics

Overview

Harmonics

display

PX5 allows users to view voltage and current harmonics/interharmonics in graphical or

in list form. Harmonics are waveform distortion, a steady-state deviation from an ideal

power frequency sinusoid and is characterized by the spectral content of the waveform.

Interharmonics are frequency components between the harmonic frequencies. The IEC

61000-4-7 Standard dictates that harmonic analysis is done using a synchronous

window of 10 cycles for 50 Hz, or 12 cycles for 60 Hz. This results in bins which are

nominally 5 Hz wide. The actual width of the bins is equal to the actual frequency

divided by 10 if the nominal frequency is 50 Hz, and 12 if 60 Hz. For example, if

actually operating at 49.9 Hz, the bin is 4.99 Hz, but is labelled “5 Hz” as specified by

the standard.

Use the respective touch screen buttons to display the next Channel (Channels A, B, C,

D) and the next Parameter (V, I, W) of harmonic data. The number of harmonics/

interharmonics displayed is up to the 60th. Summary values of odd, even and total

distortion are displayed. A summary of harmonic distortion as well as interharmonic

distortion values per phase/parameter are also available on display.

Users can determine the number or range of harmonic frequencies to trend and view in

detail. There is also the option to select how to plot harmonic/interharmonic data and

specify the units of measure by which harmonic data is calculated.

Harmonic Graph

: Harmonics are measured in accordance with IEC 61000-4-7 Class 1.

Users can choose the unit of measure by which harmonic data is calculated and

graphed, based on a Percentage of the fundamental value or in Engineering units (volts

and amps). Frequency components of harmonic graphs can be displayed either in Hertz

or in Harmonic Number. The graphs can be zoomed and rescaled.

Harmonic List

: The list gives a textual display of the following for each of the

measured values: frequency and harmonic number; magnitude in Engineering units and

percent of fundamental; phase in degrees (for harmonics only). This list is displayed in

order of ascending frequency, and can also be sorted in order of descending magnitude.

In this section

The following topics are covered in this section.

Topic See Page

Harmonic Graph 3-16

Harmonic Detail 3-17

Harmonic Options 3-18

Harmonic List 3-20

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 289 290

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