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