YOKOGAWA WT3002E - Voltage Fluctuation and Flicker Measurement Specifications

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.