MeasureDetectControl

Power Quality Audit

As more and more industries opt for process automation to increase control over operations and save on energy, the use of electronic equipment has also increased simultaneously.

 

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(PDF 5.7 MB)

 
The use of devices such as variable speed drives, rectifiers, and energy savers cause harmonics and transients in the network - thus defeating their very purpose of energy efficiency.

Symptoms of Harmonics

  • Blinking of incandescent bulbs
  • Capacitor failure
  • Circuit breaker tripping
  • Computer malfunction or lockup
  • Conductor failure
  • Failure of electronic equipment
  • Flickering of fluorescent tubes
  • Blown fuses
  • Motor failures due to overheating
  • Excessive neutral current
  • Neutral conductor and terminal failures
  • Failure of electromagnetic loads
  • Overheating of metal enclosures
  • Power interference on voice communication
  • Transformer failure

Effects of Harmonics

  • Increased losses and temperature rise leading to reduction of thermal overloading capacity
  • Resonance between inductance and capacitance of the network resulting in amplification of harmonic currents in the network
  • Accuracy of measuring instruments and protection relays affected
  • Communication signals distorted

Our comprehensive Power Quality Audit identifies harmonics in the network, and then designs filters to eliminate their effects.

Our Approach

  • Detect harmonics in the network at different feeders
  • Identification of type of harmonics, amplitude of distortion and percentage of
    I-THD and V-THD
  • Design of tuned filters to nullify effects of identified harmonics with respect to individual harmonics, amplitude of distortion and percentage of THD
  • Supply, installation and commissioning of filters
  • Performance evaluation of filters and benefits after installation

 
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