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Power Quality (or Harmonic) Audits

The term is used to describe electric power that drives an electrical load and the load's ability to function properly with that electric power. Optimal power quality results in increased mission-critical uptime, cost savings, equipment efficiency and overall facility reliability. Further, power quality data is an absolute necessity when something goes wrong and the source of the problem must be investigated, whether upstream or downstream of the issue.

  Power Quality (or Harmonic) Audits

Without the proper power, an electrical device (or load) may malfunction, fail prematurely or not operate at all. There are many ways in which electric power can be of poor quality and many more causes of such poor quality power.

The electric power industry comprises electricity generation (AC power), electric power transmission and ultimately electricity distribution to an electricity meter located at the premises of the end user of the electric power. The electricity then moves through the wiring system of the end user until it reaches the load. The complexity of the system to move electric energy from the point of production to the point of consumption combined with variations in weather, generation, demand and other factors provide many opportunities for the quality of supply to be compromised.

Power Quality (or Harmonic) Audits

While "power quality" is a convenient term for many, it is the quality of the voltage—rather than power or electric current—that is actually described by the term. Power is simply the flow of energy and the current demanded by a load is largely uncontrollable.

What is a Power Disturbance?

  Power Quality (or Harmonic) Audits

Power disturbances are defined in terms of magnitude and duration. Disturbances range from transients that last for microseconds to outages that continue for hours. When a power disturbance falls outside operating limits, equipment may be disrupted or damaged.

The Costs of Poor Power Quality due to low power factor can be Significant!

Damaged Product: Interruptions can damage a partially complete product, causing the material to be re-run or scrapped.

Lost Production: Each time production is interrupted, your business loses profit on product that is not manufactured and sold.

Energy Cost: Electric utilities may charge penalties on poor power factor or high peak demands.

We further present you step by step methodology not only to monitor but to remove power problems from the roots itself.

Power Quality Analysis

Power quality test & measure electrical load during plant’s normal operation. Compile data for V, I, PF, Harmonics & etc at respective feeders and after analysis identify areas where overall power quality needs to be improved which can result in “Energy Savings “in the range of 5-7% of total electricity bill.

Power Quality may be defined as –

  • The characteristics of the supply voltage and the electrical system that affect the performance of the load.
  • The characteristics of the load that affect the electrical system or other loads
  • Value of the Voltage and other PQ parameters including the harmonics and the individual harmonic THD’s as a percent of the Nominal Values.

The power quality analysis provides you with an opportunity to be aware of the quality of the electrical power being utilized by your facility. Power Quality Includes –

  • RMS measurements of voltages & currents
  • Harmonics up to the 50th order, with their phase information
  • Total Harmonics Distortion (THD)
  • Total VA, W & VAr power values as well as per phase values
  • Total VAh, Wh & VArh power values as well as per phase values
  • Power factor
  • Current & voltage unbalances
  • Frequency
  • Neutral Current
  • Peak, Minimum & Maximum values


We recommend that power quality audit shall be perform two times in year, because

1. It detect electrical parameter variation against standard bench mark,
2. It analyzes & prevents upcoming problems in electrical system,
3. bench mark performances at individual point on power system,
4. 100% saving of downtime,
5. Longer life of equipments,
6. Uninterrupted service of equipments,
7. Utility bill reduction,
8. If plant is working 24X7Hrs. then it is essential to keep electrical system uninterruptible.

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