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Measurement Functions Indicating the Phase Difference of the Fundamental
Voltage and Current between Elements
Item
Phase difference U1-U2 (°)
Phase difference U1-U3 (°)
Phase difference U1-I1 (°)
Phase difference U1-I2 (°)
Phase difference U1-I3 (°)
Measurement Functions (Σ Functions) Determined for Each Wiring Unit (ΣA and ΣB)
Item
Voltage (V)
Current (A)
Active power (W)
Apparent power (VA)
Reactive power (var)
Power factor
*1 The total is a value determined according to the equation given on the next page from the fundamental signal
st
(1
order) and all harmonic components (2
also be included. The total value cannot be measured with the harmonic measurement in normal measurement
mode.
IM WT3001E-51EN
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.
Symbol and Meaning
φU1-U2: P hase difference of the fundamental voltage (U2(1)) of element 2 with respect to the
fundamental voltage (U1(1)) of element 1.
φU1-U3: Phase difference of the fundamental voltage (U3(1)) of element 3 with respect to U1(1).
φU1-I1: Phase difference of the fundamental current (I1(1)) of element 1 with respect to U1(1).
φU1-I2: Phase difference of the fundamental current (I2(1)) of element 2 with respect to U1(1).
φU1-I3: Phase difference of the fundamental current (I3(1)) of element 3 with respect to U1(1).
Symbol and Meaning
UΣ(1): rms value of the harmonic voltage of order 1
IΣ(1): rms value of the harmonic current of order 1
PΣ(1): Active power of the harmonic signal of order 1
SΣ(1): Apparent power of the harmonic signal of order 1 SΣ: Total apparent power (total value
QΣ(1): Reactive power of the harmonic signal of order 1 QΣ: Total reactive power (total value
λΣ(1): Power factor of the harmonic signal of order 1
nd
to the upper limit of the measured order). The DC component can
7.11 Harmonic Measurement Specifications
UΣ: Rms voltage (total value
IΣ: Rms current (total value
PΣ: Active power (total value
λΣ: Total power factor (total value
1
2
3
4
5
*1
)
*1
)
6
*1
)
*1
)
*1
)
*1
)
7
8
9
10
11
12
13
Index
7-41
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