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RANGE (Input A / Input B) ....... Settings of ranges for both measurement inputs (this part of settings
Auto ............................. Automatic range selection: ON (enabled) or OFF (disabled). Device
Value ........................... Manually selected range (valid if parameter Auto is OFF)
Meas. Settings screen 3/6
Start-up mode ........................ Defines initial measurement settings (Connection type, System,
REACTIVE POWER MEAS ..... Setting of reactive power measurement
Method ........................ Measurement method: True, Cross, Shift or Fund. f.
50
is stored in SD card, but only for particular accessory. If other
accessory is used, default values will be loaded. Accessory is
identified by its serial number)
chooses best suitable range depending on measured values if
automatic range selection is enabled.
* P46
Energy, Constant, Unit) activated right after device power up:
Meas. determines last settings used before switch-off,
Test defines parameters of last used meter from database.
Remark: method Fund. f. is available only from firmware v. 5.69
Description of supported reactive power meas. methods:
True ... classic calculation: �� = √��
reactive power calculated from Shift method. This method's result is
considered by IEEE 1459-2010 as nonactive power. IEEE 1459-2010
defines only nonactive power and fundamental reactive power.
Cross ... calculation from artificial connection:
�� = ��
+ ��
+ ��
= (√3 ∗ ��
1
2
3
Rem: The system must be balanced for achieving correct values! This
method is valid only in 3-phase connections with phase sequence L123. In
3-phase system with phase sequence L132 this method calculates results
with opposite sign.
Shift ... calculation from U and I where current is shifted by ¼ of
period in time domain: �� = �� ∗ ��'. This approach is mentioned in
Annex A of IEEE 1459-2010.
Rem: Method does not consider higher harmonic components correctly!
WS-UGFW619-EN
Working Standard
Meas. Settings screen 4/6
2
2
− ��
. The sign is determined by
∗ ��
) + (√3 ∗ ��
23
1
31
User's Guide
* P88
∗ ��
) + (√3 ∗ ��
∗ ��
)
2
12
3
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