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Course Description

‘Flicker’ is the fluctuation of illumination, which may be annoying to the human eye. The level of physiological discomfort depends on the amplitude of the fluctuations. To reduce the fluctuations to an acceptable level, mitigation may be required. The phenomenon is caused by the variation of voltage during a short period of time (<1 second). Owing to rapid voltage variations, the illumination levels of different types of lighting may vary. Whether the respective levels of flicker are considered irritating will vary from one person to the next.  The network operator is generally responsible for this phenomenon and for dealing with the resulting customer complaints. In the module ‘flicker’ we will examine the different causes of flicker. In addition, the associated costs of flicker are discussed, options to reduce flicker are presented, and three case studies on the topic of flicker are presented. 

What you will learn

  • Understanding the concept and characteristics of flicker 
  • Sources causing the phenomena and the underlying causes
  • Flickermeter concept
  • Measuring and quantifying flicker. Pst and Plt indexes
  • Standards and norms regulating the phenomena
  • Different proposals for reducing/removing flicker 
  • Sensitivity comparison for different light types
  • Percent flicker and flicker index parameters
  • Costs resulting from flicker
  • Mitigation techniques at point of connection and at grid level
  • Solving three detailed cases based on real industry problems

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