Harmonic Standards :
Considering that the harmonic
problems will increase in the
future, precautions should be taken
to produce low level harmonics in
the establishment stage of the
facilities containing nonlinear
loads. The system must be measured
accurately and continuously and
these standards must be ensured.
Necessary definitions, indices and
limitations are made in harmonic
standards of IEEE and IEC. In the
logic of the standards stipulated by
IEC, there is a limitation of the
harmonics resulting from each load
connected to the system. Thus, the
total effect of the harmonics is
thought to be limited. Therefore,
the method proposed by IEC is
applied at the point where any
nonlinear load is connected. The
standards set by IEEE are applied to
both current and voltage harmonics
and to the central busbars where
more than one nonlinear load is
connected. IEEE, IEC and EN
standards of harmonics are
summarized in Table 1. Dugan, R. C.,
McGranagan, M. F. and Beaty, H. W .;
, Electrical Power Systems Quality
”, Mc Graw-Hill, 1996.
Table 1. IEEE, IEC and EN standards
on harmonics |