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Demystifying IEEE Flicker Standards: IFL, Pst, and Plt Explained
This white paper clarifies the definitions and measurement techniques for electrical flicker, focusing on the IEEE and IEC standards for IFL (Instantaneous Flicker Level), Pst (Percentile Short Term flicker), and Plt (Percentile Long Term flicker). It compares the historic GE Flicker Curve with modern IEC 61000-4-15/IEEE 1453 methods, explains the physiological basis for flicker perception, and highlights the importance of accurate flicker measurement for power quality monitoring and compliance.
Key topics include:
- Definition and Human Perception of Flicker
- Causes of Flicker in Electrical Systems
- Historical Standards: The GE Flicker Curve and IEEE 141
- Modern Flickermeter Measurements: IEC 61000-4-15 and IEEE 1453
- Key Flicker Metrics: IFL, Pst, and Plt
- Comparison of Standards and Compatibility Levels
- Finding and Measuring Flicker Sources
Why utilities should care:
Accurate flicker measurement ensures compliance with power quality standards, reduces customer complaints, and helps identify potential hazards from voltage fluctuations. Adopting modern standards enables consistent monitoring, improved reliability, and better mitigation of flicker-related issues.
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