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Dran-View 6 User Guide

10.12. Harmonics/Timeplot Calculator

Harmonics /

Timeplot

Calculator

When you select this command, the Harmonics/Timeplot Calculations dialog box

will be shown. Once you have selected the parameters that you wish to calculate,

click OK.

Introduction

You may want to view parameters like half-cycle RMS values and the harmonic

contents of input waveforms. This command is useful since not all data sources

loaded into Dran-View contains this type of information.

Depending on the instrument that you are using, the following guide may assist in

determining how you should use this tool.

Dranetz-BMI

PowerXplorer PX5,

PowerGuide 4400,

Signature System

Creates RMS values on a one-cycle basis, slides the one-

cycle window so two RMS points are created per

waveform cycle. 10-cycle Harmonic Groups and 10-cycle

Interharmonic Groups may also be created.

Tech Note:

A 10-cycle harmonic analysis will produce a frequency spectra with

a resolution of 5Hz / band.

A Harmonic Group is the Harmonic frequency component weighted

together with its two 5 Hz band neighbors.

An Interharmonic group is the “sum” of the remaining 5Hz bands

between each Harmonic Group.

When to use this tool:

In Inrush measurement, you may want to see a sliding

one-cycle window of V,I,P,Q,S, Symmetrical

Components, Unbalance factors, and Frequency as they

change during the Inrush Waveshape. This high-density

information is not provided by the instrument.

When not to not use this tool:

The instrument 10-cycle harmonic groups are more

“steady-state”, conforms to the new standards, and should

normally be used instead of the sliding once-cycle

harmonics created by this tool.

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Dranetz Guide Guide de l'utilisateur Page 106