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10 Voltage Fluctuations and Flicker Measurement
10.1 Limits
Test item
Pst
Plt
Limit
1.0
0.65
Tmax (ms)
500
dmax (%)
4
dc (%)
3.3
Note
Pst: short-term flicker severity.
Plt: long-term flicker severity.
Tmax: maximum time duration during the observation period
that the voltage deviation d(t) exceeds the limit for dc .
dmax: maximum absolute voltage change during an
observation period.
dc: maximum steady state voltage change during an
observation period.
10.2 Test Instruments
Description & Manufacturer
TESEQ
5KVA AC POWER
SOURCE/CONDITION UNIT
Software
Model No.
Serial No.
NSG 1007/
CCN 1000-1
1323A00070/
1318A02119
Win2100 V4.5.8
NA
Cal. Date
Cal. Due
Aug. 21, 2014 Aug. 20, 2015
NA
NA
Notes: 1. The test was performed in Hwa Ya EMS Room.
2. The calibration interval of the above test instruments is 12 months and the calibrations are traceable
to NML/ROC and NIST/USA.
10.3 Test Arrangement
a.
The EUT was placed on the top of a wooden table 0.8 meters above the ground and operated to produce
the most unfavorable sequence of voltage changes under normal operating conditions.
b.
During the flick measurement, the measure time shall include that part of whole operation cycle in which
the EUT produce the most unfavorable sequence of voltage changes. The observation period for
short-term flicker indicator is 10 minutes and the observation period for long-term flicker indicator is 2
hours.
EUT
Report No.: CE150723C22
Page No. 48 / 87
Report Format Version: 6.1.2