Table of Contents
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Determination of Measurement Functions Related to the IEC Harmonic
Measurement
Measurement Function
Rms value of the harmonic
subgroup of the voltage
U( )[V]
Rms value of the harmonic
subgroup of the current
I( )[A]
Rms value of the harmonic
group of the voltage
U( )[V]
Rms value of the harmonic
group of the current
I( )[A]
IM WT3001E-51EN
9.6 IEC Harmonic Measurement Specifications
Method of Determination, Equation
When the frequency of
the measured item is 50 Hz
4
2
2
U(k-5)
U(k+5)
2
+
U(k+i)
+
2
2
i = -4
4
I(k-5)
2
I(k+5)
2
2
+
I(k+i)
+
2
2
i = -4
When the frequency of
the measured item is 60 Hz
1
2
U(k+i)
i = -1
1
2
I(k+i)
i = -1
5
2
U(k-6)
+
U(k+i)
2
i = -5
5
I(k-6)
2
2
+
I(k+i)
2
i = -5
1
2
3
4
2
U(k+6)
2
+
2
5
I(k+6)
2
+
2
6
7
8
9
10
11
12
13
Index
9-13
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