13.2 Input Specifications/Output Specifications/Measurement Specifications
206
(23) Voltage unbalance factor (negative-phase unbalance factor, zero-phase unbalance factor) (Uunb, Uunb0)
Measurement method Calculated using various components of the 3-phase fundamental voltage
wave (line-to-line voltage) for 3-phase 3-w
ire (3P3W2M, 3P3W3M) and 3-phase
4-wire connections. (For
details, see "13.8 Calculation Formula" (p.231))
The string "-----" will appear when the RMS voltage values of all three phases are zero.
Displayed item Negative-phase unbalance factor (Uunb), zero-phase unbalance factor (Uunb0)
Measurement range Component is V and unbalance factor is 0.00% to 100.00%.
Measurement accuracy When the measurement frequency is set to 50 Hz/60 Hz, ±0.15%
(0.0% to 5.0% range specified for IEC61000-4-30 performance testing)
Event threshold 0.0% to 100.0%
Event IN Start of approx. 200 ms aggregation in which reading was greater than the threshold
Event OUT Start of approx. 200 ms aggregation in which the reading was less than (threshold - hysteresis)
Multiple-phase system treatment None
Saved waveforms Event waveforms
(24) Current unbalance factor (negative-phase unbalance factor, zero-phase unbalance factor) (Iunb, Iunb0)
Measurement method For 3-phase 3-wire (3P2W2M and 3P3W3M) and 3-phase 4-wire, calculated using 3-phase funda-
mental current component (For details, see "13.8 Calculation Formula" (p.231).)
The string "-----" will appear when the RMS current values of all three phases are zero.
Displayed item Negative-phase unbalance factor (Iunb), zero-phase unbalance factor (Iunb0)
Measurement range Component is A and unbalance factor is 0.00% to 100.00%.
Measurement accuracy -
Event threshold 0.0% to 100.0%
Event IN Start of approx. 200 ms aggregation in which reading was greater than the threshold
Event OUT Start of approx. 200 ms aggregation in which the reading was less than (threshold - hysteresis)
Multiple-phase system treatment None
Saved waveforms Event waveforms
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