Voltage Flicker Analysis and Solution.aspx
Power Quality
To us Power Quality is characterized by
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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.
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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
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Capacitor heating/failure
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Telephone interference
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Rotating equipment heating
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Relay misoperation
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Transformer heating
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Switchgear failure
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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