الفهرس 
PRINCIPLES OF ELECTRICAL DISTRIBUTION SYSTEM PLANNINGOnly 14 pages are availabe for public view
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Abstract
I N T R 0 D U C T I 0 N.
The electric power system includes generating, transmission,
and dj_stribution systems. Generally, the
sum of the capital investment of generation and distribution
facilities is over 80 percent of the total
system investment. The economic importance of the
distribution system requires a careful engineering
planning, design, construction, and good performance
of operation and maintenance.
The integrated distribution system, from the engineering
point of view, includes the subtransmission circuits,
primary substations, distribution points, main
primary feeders, distribution transformers (kiosks),
primary feeder sections, secondary circuits, and
customer service connections.
As far as the Egyptian electric distribution system
is concerned, the statistics of the data collected
over about 10 years proves that the demand of the
electric energy has been highly increased. The annual
rate of its increase reached about 14% which is considered
a very high rate compared to the international
rates.
Therefore, the electric power engineers, planners,and
investigators recently pay a careful attention and
special interest to the planning of either new distribution
networks or expansion of the present networks.
Thus, the elaboration and development of the planning
of the distribution networks to meet the demand
required by the land use, has gained a prime interest
and importance.
Further, the objective of the distribution system
planning - as known - is started from the demand loads
required by the secondary connections (customers) till
the bulk power substations. Furthermore, the investment
for the different components as well as the
energy losses costs are main factors affecting the
planning and design of the distribution networks.
Hence, for the system planning, it is essential to
assure that the growing demand for electricity can be
satisfied by distribution system additions which are
both technically adequate and acceptably economical.
The above considerations call strongly for continuous
efforts of researchersand engineers to develop reliable
concepts and rules for distribution system
planning. Unfortunately, previous investigation