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Assumptions: 5000A short circuit supply capability, equivalent to 146µH supply
impedance
=
h 2
2
h
∑
=
h 40
%
THD(V) x 100
=
1n
Q
where Q1n is the rated rms value of the fundamental voltage of the supply
transformer.
The results conform to stage 1, stage 2 and stage 3 of the Engineering
Recommendation G.5/3 September 1976, Classification ‘C’: Limits for Harmonics
in the UK Electricity Industry.
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