COMPACT VERSUS CONVENTIONAL EHV LINES
TECHNICAL AND ECONOMICAL COMPARISONS
(1984)Abstract
The study of the so-called "compact lines" was
originally dictated by the need to increase the
power density over a given corridor in order to
allow the transmission of suitable powers in high
density populated areas,and to minimize the effect
on the landscape.
In the sixties-seventies the study of possible
future UHV sys~ems gave an impact to the
development of new structural concepts for
transmission lines cover1ng electrical, mechanical
and environmental aspects.
Considering that the size of conventional
structures is controlled primarily by the clearances
between conductors and steel tower, new lines
without structure members between phases have been
proposed by many authors (1-2-3-4-5).
Nowadays, various utilities are considering the
adoption of these compact lines even when there are
ho stringent constraints due to land occupation;
this taking into account that compaction of the
line increases the surge impedance loading and
therefore the transmission capacity for long
distance.
on the basis of some rationalized criteria, in
this paper compact lines are compared to conventional
ones for different structural solutions and for
applications both in strongly interconnected
systems and in long distance.transmission.
The comparison is extended to six-phase lines which
represent a further step in compaction.
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