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9-8
Technical Specifications
Supply Harmonic Analysis (230V filtered)
Assumptions:
(Short circuit fault to Neutral)
5kA short circuit supply capability at 230V 1φ, equivalent to 146µH supply impedance
7.5kA short circuit supply capability at 230V 3φ, equivalent to 56µH supply impedance
10kA short circuit supply capability at 400V 3φ, equivalent to 73µH supply impedance
h= 2
THD(V) x 100 =
∑ Q h2
h = 40
Q
%
1n
where Q1n is the rated rms value of the fundamental voltage of the supply transformer.
The results conform to stage 1 and stage 2 of the Engineering Recommendation G.5/4 February 2001,
Classification ‘C’: Limits for Harmonics in the UK Electricity Industry.
Drive Type
Motor Power (kW)
Fundamental Voltage (V)
Typical Motor Efficiency %
Harmonic No.
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
40
Total RMS Current (A)
THD (V) %
0.25
230
85
0.37
230
85
0.55
230
85
0.75
230
85
650V
1.1
230
85
1.5
230
85
2.2
230
85
3.0
230
85
4.0
230
85
TBA
TBA
TBA
RMS Current (A)
7.4
7.5
7.8
8.2
9.0
10.3
1.4
0.2
1.9
2.2
2.9
3.9
2.9
0.4
4.4
4.6
4.8
5.2
1.1
0.5
1.9
2.0
2.3
2.5
0.2
0.2
0.2
0.3
0.4
0.4
0.1
0.1
0.2
0.2
0.2
0.3
0.0
0.1
0.1
0.1
0.1
0.1
0.1
0.0
0.1
0.1
0.1
0.1
0.0
0.1
0.0
0.0
0.0
0.1
0.0
0.0
0.0
0.0
0.0
0.1
0.0
0.0
0.0
0.0
0.0
0.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
8.2
0.3559
7.5
0.0972
9.3
0.5426
9.9
0.5733
10.9
0.6277
12.5
0.7055
650V AC Drive