Abstract
The thesis investigated the possibility of overhead power line designs being decided by using an objective rather than
a subjective method. Power lines are required to meet criteria for load and transfer capability as specified by system
planners which results in many different line design solutions. The decision as to which solution to adopt and
construct is difficult if a subjective method is used. The hypothesis proposed is thus as follows:
It appears that one or a small set of appropriate technology indicators can be used by network planners and designers
to identify the best group of overhead lines to meet specified objectives. These indicators can be used for a wide range
of applications for AC and DC lines
The research was performed by investigating the specifications of the planners and determining the different line
designs that could complete the work. This was based on actual case studies of lines designed and built in Eskom
South Africa. In addition the parameters for AC and DC lines were examined and parameters selected that would best
represent the requirements of the planners as well as cover most of the variables involved in line design. These
include the conductor, subconductor bundle, the phase spacing for AC and pole spacing for DC, the tower type and
the foundation type.
Indicators were derived for both AC and DC line designs using a simple scoring method. An overall score based on
weighting factors can be determined for each line design option. By varying the weighting factors the most robust
design can be determined. The indicators do not determine the optimum design but rather indicate the group of
designs that need to be developed further and implemented. The method is thus a business tool whereby the
optimum group of designs can be determined for further analysis and decision.
The findings were that the hypothesis is valid. For AC and DC systems separate indicators which form part of the
optimisation process are required.
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