12-33
IM WT3001E-51EN
Voltage Fluctuation and Flicker Measurement (Option)
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Index
12.7 Voltage Fluctuation and Flicker Measurement
Specifications
Normal Flicker Measurement Mode
Item
Specifications
Measurement Items
(Measurement Functions)
dc
Relative steady-state voltage change
dmax
Maximum relative voltage change
Tmax
*1
The time during which the relative voltage change during a voltage fluctuation
period exceeds the threshold level
The maximum value within a observation period is displayed for the items above.
Pst
Short-term flicker value
Plt
Long-term flicker value
One observation period
30 s to 15 min
Observation period count
1 to 99
*1 Tmax for IEC 61000-3-3 Ed3.0, d(t) for IEC 61000-3-3 Ed2.0
Measurement of dmax Caused by Manual Switching Mode
Item
Specifications
Measurement Items
(Measurement Functions)
dmax
Maximum relative voltage change
One observation period
1 minute
Observation period count
24
Averaging
Average of 22 measured dmax values excluding the maximum and minimum values among 24 values
Items Common to Measurement Modes
Item
Specifications
Flickermeter class
F2
Target voltage/frequency
230 V/50 Hz, 120 V/60 Hz, 230 V/60 Hz,
*2
or 120 V/50 Hz
*2
Measured item
All installed elements
Measured source input
Voltage (current measurement function not available)
Flicker scale
0.01 to 6400 P.U. (20%) divided logarithmically into 1024 levels.
Display update
2 s (dc, dmax, and Tmax
*3
)
For every completion of a observation period (Pst)
Communication output
dc. dmax, Tmax
*3
, Pst, Plt, instantaneous flicker sensation (IFS), and cumulative probability function
(CPF)
Printer output
Screen image
External storage output
Screen image
Accuracy
dc, dmax: ±4% (at dmax = 4%)
Pst:
±5% (at Pst = 1)
Conditions for the accuracy above
• Ambient temperature: 23 ± 1°C
• Line filter: OFF
• Input voltage range
220 V to 250 V at the 300 V measuring range
110 V to 130 V at the 150 V measuring range
*2 Correspond by the IEC 61000-4-15 Ed2.0.
*3 Tmax for IEC 61000-3-3 Ed3.0, d(t) for IEC 61000-3-3 Ed2.0
Functional Limitations
Item
Specifications
Integration
Not allowed
Store
Not allowed
Synchronized measurement Not allowed
Auto print
Not allowed
E-mail transmission
Not allowed
For a list of functional limitations, see appendix 10 in the
User’s Manual IM WT3001E-01EN
.
