1 standards and calibration laboratory, scl evaluation of flicker severity in standards and...
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![Page 1: 1 Standards and Calibration Laboratory, SCL Evaluation of Flicker Severity in Standards and Calibration Laboratory (SCL) Speaker: Chung Yin, Poon Standards](https://reader030.vdocument.in/reader030/viewer/2022032415/56649f045503460f94c1831e/html5/thumbnails/1.jpg)
1Standards and Calibration Laboratory, SCL
Evaluation of Flicker Severity in Standards and Calibration
Laboratory (SCL)
Speaker: Chung Yin, PoonStandards and Calibration Laboratory (SCL)The Government of the Hong Kong Special
Administrative Region
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2Standards and Calibration Laboratory, SCL
Learning Objectives
• To introduce the meaning of flickers in power line
• To describe a method for calibrating flicker source and flickermeter
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3Standards and Calibration Laboratory, SCL
Introduction
• Flicker is the change in brightness of a lamp due to rapid fluctuations in the voltage of the power supply
• Cause disturbance to human visual perception system
• Voltage change characteristic at the terminals of the equipment under test, such as microwave ovens, washing machines
• All types of voltage fluctuations may be assessed by direct measurement using a flickermeter
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4Standards and Calibration Laboratory, SCL
Introduction
Source: Figure B.1, IEC 61000-4-15-2010 Flickermeter - Functional and design specifications
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5Standards and Calibration Laboratory, SCL
Evaluation of flicker parameters
• Flickermeter (Functional and design specification in IEC 61000-4-15)
• Flicker source (Limits of voltage changes produced by an equipment in IEC 61000-3-3)
• SCL developed a system to evaluate the accuracy of flicker source and flicker measurement functions of flickermeter
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6Standards and Calibration Laboratory, SCL
Operating Principle• Flicker waveform is modeled as an amplitude
modulated (AM) signal in power line (120 V / 230 V)
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7Standards and Calibration Laboratory, SCL
Operating Principle
• Relative voltage change / Voltage fluctuation
• Vupper: Amplitudes of upper sideband
• Vlower: Amplitude of lower sideband
• Vcarrier: Amplitude of the carrier
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8Standards and Calibration Laboratory, SCL
Calibration of flicker source - Setup
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9Standards and Calibration Laboratory, SCL
Resistive voltage divider
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10Standards and Calibration Laboratory, SCL
Calibration of flicker source - Setup
![Page 11: 1 Standards and Calibration Laboratory, SCL Evaluation of Flicker Severity in Standards and Calibration Laboratory (SCL) Speaker: Chung Yin, Poon Standards](https://reader030.vdocument.in/reader030/viewer/2022032415/56649f045503460f94c1831e/html5/thumbnails/11.jpg)
11Standards and Calibration Laboratory, SCL
Calibration of flicker source
• Voltages of lower sideband (Vlower), carrier (Vcarrier) and upper sideband (Vupper) in dB are measured by signal analyzer
• Accuracy of the voltage fluctuation of standard flicker source can be determined
![Page 12: 1 Standards and Calibration Laboratory, SCL Evaluation of Flicker Severity in Standards and Calibration Laboratory (SCL) Speaker: Chung Yin, Poon Standards](https://reader030.vdocument.in/reader030/viewer/2022032415/56649f045503460f94c1831e/html5/thumbnails/12.jpg)
12Standards and Calibration Laboratory, SCL
Calibration of flickermeter
• Flickermeters under test are calibrated by direct comparison with the standard flicker source
• Calibration in terms of voltage fluctuation and modulating frequency
• Instantaneous flicker sensation (Pinst) will be compared against the theoretical values as illustrated in IEC 61000-4-15
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13Standards and Calibration Laboratory, SCL
Calibration of flickermeter - Setup
![Page 14: 1 Standards and Calibration Laboratory, SCL Evaluation of Flicker Severity in Standards and Calibration Laboratory (SCL) Speaker: Chung Yin, Poon Standards](https://reader030.vdocument.in/reader030/viewer/2022032415/56649f045503460f94c1831e/html5/thumbnails/14.jpg)
14Standards and Calibration Laboratory, SCL
What to be measured?
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15Standards and Calibration Laboratory, SCL
Measurement uncertainties
• Depends on– Amplitude accuracy of signal analyzer– Performance of standard flicker source– Calibration setup
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16Standards and Calibration Laboratory, SCL
Maximum uncertainty of voltage fluctuation measurement
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17Standards and Calibration Laboratory, SCL
Measurement uncertainties
• Flicker source: Measurement uncertainty < 0.03% at 95% confidence level
• Flickermeter: Measurement uncertainty < 0.3% for determination of flicker severities at 95% confidence level
• Type testing of Class F1 flickermeters according to IEC 61000-4-15– Tolerance of 8% in Pinst for sinusoidal voltage changes
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18Standards and Calibration Laboratory, SCL
Ratio between the specifications of standard flicker source and maximum measurement uncertainty (TUR)
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19Standards and Calibration Laboratory, SCL
Thank you