Abstract
New or upgraded transmission lines through urban
areas with an existing or growing infrastructure are
often a special challenge in respect to right of way
and disturbance constraints. With the progress in
composite insulator-technology, cost-effective solutions
exist in comparison to cable or gas-insulated
lines. The paper deals with a part of DEWA's 420
kV line from Mushrif to Nahda substation that required
a compact monopole solution. The first part
of the paper covers the specific requirements for
the line section with the compact monopoles. In
the second part, the engineering for an optimized
design solution for the insulated crossarm is described.
The test results are presented for both,
the suspension and the angle poles. The test programme
was deduced from the project specification
and followed the relevant IEC standards, when
applicable. In a third part, a brief comparison of the
cost savings because of installation easiness of
monopoles is tabulated.
DEWA's project has shown that a close cooperation
between the utility, the line designer and the
pole, as well as the insulator manufacturer can
provide optimal configurations with materials and
manufacturing technologies, which have been in
service since many years. This long-term experience,
also under the specific in-situ conditions of
DEWA's transmission network, is an important
feature in respect to the reliability and the outage
risk for strategically important lines.
The compact overhead line route has successfully
been installed during January 2007 to April 2007
and the commissioning was early summer 2007.
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