In this report the effect of harmonics on the power
system equipment and loads, with special attention given
to the circumstances in ships, is discussed. Some
guidelines are given for the computation of additional
harmonic losses in power cables and transformers. It is
also shown, that if the system is rich in harmonics,
these losses must be taken into account when sizing the
The effect of harmonics on electrical machines is also
discussed. The influence on induction machines is usually
small. However, in large synchronous machines a
significant degree of harmonic losses may be expected.
Especially in the high voltage system the harmonics must
be taken into account when selecting the machine ratings.
Also the harmonic resonances, which may arise when using
reactive power compensation capacitors, are discussed.
Due to the risk of harmonic resonances, the use of
capacitors is not recommended in marine power systems.
Also the immunity of different load devices to harmonic
distortion is discussed. The equipment considered are
resistive loads, discharge lamps, universal machines and
electronic equipment. Finally a brief survey is given on
the standards and recommendations for the maximum
distortion levels allowed.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||25|
|Publication status||Published - 1996|
|MoE publication type||Not Eligible|
|Series||VTT Tiedotteita - Meddelanden - Research Notes|
- power equipment
- electric drives
- electric propulsion
- marine propulsion
- electric power generation