Dranetz Portable Instruments Power Visa & HDPQ Visa using Dran-View 7 Software to View the Waveforms & Correct A CT Connection Error

Case 1. Display waveforms of voltage, current and Power before, during and after an event.

Application note for Power waveforms and harmonics_image1

 

Case 2. Display waveforms of voltage, current and calculate the power waveform from the data of any waveforms recorded by the instrument.

Application note for Power waveforms and harmonics_image2

HDPQ waveforms of Voltage, current and Power from 10 cycles of waveform data.

Case 3. Display harmonic spectrum of the waveforms from case 1 and case 2.

Application note for Power waveforms and harmonics_image3

Calculated from waveforms above (case 1 & 2).

Case 4. Correct power displayed due to CT connection error.

Application note for Power waveforms and harmonics_image4

Voltage and current waveform with Decaying Ringwave transient. Current waveform – CT is reversed.

Use Rescue Kit to correct the CT connection error.

Application note for Power waveforms and harmonics_image5Application note for Power waveforms and harmonics_image6Application note for Power waveforms and harmonics_image7Application note for Power waveforms and harmonics_image8

Application note for Power waveforms and harmonics_image9

Corrected waveforms

Case 5. Voltage, current and power waveforms before, during and after a voltage sag with harmonics calculated. (2 examples)

Application note for Power waveforms and harmonics_image10

Example 1. Voltage, current, power waveforms with harmonics calculated.

Application note for Power waveforms and harmonics_image11

Example 2.

Conclusions:

HDPQ (and PX5/PG/PV) can record the voltage and current waveform samples. Then Dv6 or DV7 can calculate all the parameters from the samples.

This application note: shows the ability for the user to see not only waveform of power but also analyze the harmonics before during and after the voltage sag or decaying ring-wave event.

This application note also shows how the user can correct the data if the installer makes a connection mistake.

Questions: contact Terryc@powerquality.org

Published by PQTBlog

Electrical Engineer

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