YOKOGAWA WT3002E - Page 144

7-41
IM WT3001E-51EN
Harmonic Measurement in Normal Measurement Mode (Option)
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Index
Measurement Functions Indicating the Phase Difference of the Fundamental
Voltage and Current between Elements
These measurement functions express the phase difference of fundamental wave U(1)
and I(1) of other elements with respect to the fundamental wave U(1) of the element
with the smallest number of the input elements that are assigned to the wiring unit. The
following table indicates the measurement functions for a wiring unit that combines
elements 1, 2, and 3.
Item Symbol and Meaning
Phase difference U1-U2 (°) φU1-U2:Phasedifferenceofthefundamentalvoltage(U2(1))ofelement2withrespecttothe
fundamental voltage (U1(1)) of element 1.
Phase difference U1-U3 (°) φU1-U3:Phasedifferenceofthefundamentalvoltage(U3(1))ofelement3withrespecttoU1(1).
Phase difference U1-I1 (°) φU1-I1:Phasedifferenceofthefundamentalcurrent(I1(1))ofelement1withrespecttoU1(1).
Phase difference U1-I2 (°) φU1-I2:Phasedifferenceofthefundamentalcurrent(I2(1))ofelement2withrespecttoU1(1).
Phase difference U1-I3 (°) φU1-I3:Phasedifferenceofthefundamentalcurrent(I3(1))ofelement3withrespecttoU1(1).
Measurement Functions (Σ Functions) Determined for Each Wiring Unit (ΣA and ΣB)
Item Symbol and Meaning
Voltage (V) UΣ(1):rmsvalueoftheharmonicvoltageoforder1 UΣ:Rmsvoltage(totalvalue
*1
)
Current (A) IΣ(1):rmsvalueoftheharmoniccurrentoforder1 IΣ:Rmscurrent(totalvalue
*1
)
Active power (W) PΣ(1):Activepoweroftheharmonicsignaloforder1 PΣ:Activepower(totalvalue
*1
)
Apparent power (VA) SΣ(1):Apparentpoweroftheharmonicsignaloforder1 SΣ:Totalapparentpower(totalvalue
*1
)
Reactive power (var) QΣ(1):Reactivepoweroftheharmonicsignaloforder1 QΣ:Totalreactivepower(totalvalue
*1
)
Power factor λΣ(1):Powerfactoroftheharmonicsignaloforder1 λΣ:Totalpowerfactor(totalvalue
*1
)
*1 The total is a value determined according to the equation given on the next page from the fundamental signal
(1
st
order) and all harmonic components (2
nd
to the upper limit of the measured order). The DC component can
also be included. The total value cannot be measured with the harmonic measurement in normal measurement
mode.
7.11 Harmonic Measurement Specifications