Abstract
The use of rotating insulating crossarms (horizontal
V) ensures the maximum effectiveness in compacting
EHV lines. However large horizontal V assemblies lead
to considerable conductor movements due to wind,
unbalanced ice accretion and short circuit stresses
which can cause:
- reduction of phase lo phase clearances;
- rotating crossarms instability.
An analysis of these movements is therefore
essential for the tower head design and for the choice of
optimum span length.
So, in the optimum compact line design it is
necessary to define criteria which may be used lo verify
that the above mentioned phenomena are not
dangerous in respect of phase-to-phase insulation and
possible crossarms failure.
In this paper some possible criteria arc suggested and
discussed. Mathematical models which can be used for
the analysis of the above mentioned phenomena are
proposed. An analysis carried out on 420 Kv lines is
presented as an example.
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