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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
