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Voltage Flicker Analysis and Solution.aspx

Power Quality



To us Power Quality is characterized by


  1. Stable AC voltages at near nominal values and at near rated frequency subject to acceptable minor variations, free from annoying voltage flicker, voltage sags, frequency fluctuations.
  2. Near sinusoidal current and voltage wave forms free from higher order harmonics


All electrical equipments are rated to operate at near rated voltage and rated frequency. Hence the first point is one of the criteria of for assessing the power quality.


As indicated in http://www.powerapps.org/Harmonic Measurements, Analysis and Filter Design.aspx , harmonics in power supply can result in the following


-         Capacitor heating/failure

-         Telephone interference

-         Rotating equipment heating

-         Relay misoperation

-         Transformer heating

-         Switchgear failure

-         Fuse blowing


To address the issues of power quality - we undertake detailed field measurements, monitor electrical parameters at various PCC’s, feeders to assess the operating conditions in terms of power quality. If problems are found, we perform detailed studies using a computer model. The accuracy of computer model is first built to the degree where the observed simulation values matches with those of the field measurement values. This provides us with a reliable computer model using which we workout remedial measures. For the purpose of the analysis we may use load flow studies, dynamic simulations, EMTP simulations, harmonic analysis depending on the objectives of the studies.

We also evaluate the effectiveness of harmonic filters through the computer model built, paying due attention to any reactive power compensation that these filters may provide at fundamental frequency for normal system operating conditions. Additionally the equipment ratings will also be addressed to account for harmonic current flows and consequent over heating.

  A related link on the studies is http://www.powerapps.org/Harmonic Measurements, Analysis and Filter Design.aspx

Typical Harmonic and Power Quality Measurements Report Extract 

  Voltage Flicker Analysis and Solution.aspx

Mail your questions, enquiries to raghunatha@powerapps.org