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Doc# E151701 13-2
13: EN50160/IEC61000-4-15 Flicker
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• Block 4 is composed of a squaring multiplier and a Low Pass filter. The Human
Flicker Sensation via lamp, eye and brain is simulated by the combined non-linear
response of Blocks 2, 3 and 4.
• Block 5 performs an online statistical cumulative probability analysis of the flicker
level. Block 5 allows direct calculation of the evaluation parameters Pst and Plt.
Flicker is computed using the three phase-to-neutral Voltages in Wye configurations
and the three phase-to-phase Voltages when in Delta. Evaluation occurs in the follow-
ing forms: Instantaneous, Short Term or Long Term.
• Instantaneous Flicker Evaluation: An output of 1.00 from Block 4 corresponds to
the Reference Human Flicker Perceptibility Threshold for 50% of the population.
This value is measured in Perceptibility Units (PU) and is labeled Pinst. This is a real
time value and it is continuously updated.
• Short Term Flicker Evaluation: An output of 1.00 from Block 5 (corresponding to the
Pst value) corresponds to the conventional threshold of irritability per IEC 1000-3-
3. In order to evaluate flicker severity, two parameters have been defined: one for
the short term called Pst (defined in this section) and one for the long term called
Plt (defined in the next section).
The standard measurement time for Pst is 10 minutes. Pst is derived from the time
at level statistics obtained from the level classifier in Block 5 of the flicker meter.
The following formula is used:
,where the percentiles P(0.1), P(1), P(3), P(10), P(50) are the flicker levels
exceeded for 0.1, 1, 2, 20 and 50% of the time during the observation period. The
suffix S in the formula indicates that the smoothed value should be used. The
smoothed values are obtained using the following formulas:
P(1s) = (P(.7) + P(1) + P(1.5))/3
P(3s) = (P(2.2) + P(3) + P(4))/3
P(10s) = (P(6) + P(8) + P(10) + P(13) + P(17))/5
P(50s) = (P(30) + P(50) + P(80))/3
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Summary of Contents for Nexus 1262
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