Transmission line compaction using high phase order transmission
Date
2016-08-17
Authors
Bortnik, Jacob
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Abstract
This report discusses high phase order (HPO) technology, i.e. the use of more than the conventional
3 phases for transmission of electric power, its use in the compaction of lines, and power
density maximization over existing servitudes. It is structured in four parts. The first part
introduces the concepts, establishes the need, and lists the advantages ofHPO. The second
part deals with the technology itself and shows that it is possible to analyze HPO systems using
symmetrical component analysis, lists common transformer configurations, covers protection,
and so on. The third part analyses 5 case studies, the first 3 being analytical, and the last 2
being the first experimental test line, and the world's :first utility application ofHPO lines.
The fmal section is a South African case study and compares an HPO line to an existing 400
kV 3-phase line and shows that the former is 87.5% more expensive to implement than the
latter. Comparing the 3-phase and 6-phase lines on a more even basis, yielded a breakeven
distance of225.86 km, above which the 6-phase option becomes more economical. These
results are then explained and discussed in the conclusions section.
Description
A dissertation submitted to the Faculty of Engineering,
University of the Witwatersrand, Johannesburg, in
fulfilment of the requirements for the degree of Master
of Science in Engineering
Degree awarded with distinction on 8 December I998
Johannesburg, 1998