Power Quality Analysis

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Harmonic distortions are one of the most common and irritating problems in industrial environment. We need to identify the source of harmonics and suppress them for a quality supply of power.

We need to measure these harmonics at various points in the system and perform proper scientific analysis as per international standards. We use IEEE-519 standards for harmonic analysis studies. Harmonic analysis is the process of identifying the harmonic distortions occur in the electrical distribution system. These studies are conducted considering the worst case of operation which gives the high amount of harmonic distortions exceeding the standards. 

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Steps in Power Quality Analysis:

• The survey aims to note down the measuring values that will use for reference throughout the survey.  

• The first step is to proceed with a correct one-line diagram of the electric system of the site.  

• Then power quality analyzer is connected at the various location in the distribution system, end of the main breaker-that regulates the incident energy levels to a satisfactory range.  

• Drill down into the distribution system as per the one-line diagram.  

• Collect data at the source of each distinct system.  

• Digital cameras usage for quick capturing of nameplate data, later identify the exact locations. Print out the captured images for the analysis; keep the data for further study and analysis.  

• To determine harmonics, the critical factors are the magnitude of the various harmonic frequencies and the total amount of harmonic distortion.  

• Record if any unusual insulation failures occur for extended periods at the equipment. It’s commonly due to lightning strikes; it will result in the switching of loads.  

• Evaluate the voltage readings for drop and rise, check whether any voltage sags and swells occur.  

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Benefits of Power Quality Analysis:

• Assist in preventative and predictive maintenance

• Identify source and frequency of events

• Develop maintenance schedules

• Monitor and trend conditions

• Analyse and study Flicker, harmonics, voltage variations, transient frequency variation etc.

• Ensure equipment performance

• Assess sensitivity of process equipment to disturbances

• Evaluate performance against specifications

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