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E154713
10-3
10: EN 50160/IEC 61000-4-30 Class A Reporting
Electro
Industries/GaugeTech
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Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
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 61000-3-3:2008 edition 2 and EN61000-
3-3:2008. 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
The .3-second memory time constant in the flicker meter ensures that P(0.1) cannot
change abruptly and no smoothing is needed for this percentile.
s
s
s
s
st
P
P
P
P
P
P
50
10
3
1
1
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0
08
.
0
28
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0
0657
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0
0525
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0
0314
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0
Summary of Contents for Shark 100T
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