DONE BY MY COLLEAGUES IN COLLEGE BSEE-5

1. TRANSMISSION-LINE
INSTALLATION

2. Submitted by :
Jonathan V. Rebanal
Kenneth Llaneta
Clint Mark Logronio
Dan Ray Tria

3. Location- when transmission line is contemplated, the first thing that should receive careful
thought is the question of the best location of the line.
In many cases the immediate requirement of transmission line merely to supply a particular load from a
particular plant. The particular route that the line should follow will depend on the following.
1. possible future markets for power.
2. suitable and economic right of way.
3. favorable climatic conditions.
In many cases it will be profitable to outline a longer route for the line, so as to take in a few towns or
localities where future demands for power can easily be met.
The most Suitable and economic right of way is independent on a very large number of items, a few of
which are named below:
1. TOPOGRAPHY
2. ACCESSIBILTY
3. COST OF RIGHT OF WAY

4. It is often necessary to take a round-about route in order t avoid
swamps or hilly country. Construction through swamps is not only
difficult but also costly. Handling of construction materials is serious
problem in very hilly country. As a general rule very long spans are
objectionable, because they involve special towers, cables, and fittings,
but in many cases it becomes necessary to use them, as in crossing a
river, a body of water, or a deep valley.
Accessibility of a line is very important, not only during construction
but also for possible repairs of patrolling.
SYSTEM TRANSMISSION- because of economical reactions, three-
phase circuits are generally used for transmission of electrical power;
hence the treatment given in this chapter, as well as that given in chap.

5. Transmission lines may conveniently be classified in the following manner:
1. SINGLE LINE
2. PARALLEL LINES
3. RADIAL LINES
4. RING SYSTEM
5. NETWORK
The simplest form is the single line, such as obtained from a power plant
supplying its entire output to ne load center over a single circuit line.
Such a system has a disadvantage that in case of damage to the line the
service is in interrupted. its use is more or less confined to small power
systems and is therefore becoming more and more uncommon.

6. LINE SUPPORTS- electrical power may be transmitted by overhead or underground
conductors. Under ground transmission , with exception of a few notable cases, is
limited to voltages less than 45,000 volts and hence, will be considered under the general
subject of distribution in chap. The supports for overhead transmission lines may be any
of the following class:
Poles…………………………………............................ Wood
Steel
Towers……………………………………………Flexible
Suspension
Dead End
There are a number of ways in which wood poles are used,
the simplest being a single pole with
cross arms carrying the insulators.

7. For two circuits it is often
necessary to use two or
three crossarms. A large
number of bracing methods
are used to strengthen pole
lines, particularly at the
corners or bends, or when
under dead end stress; one
common method known as
a frame.

8. Electric power is the rate at
which electric energy is transferred
by an electric circuit. The SI unit of
power is the watt,
one joule per second.
Electric power is usually produced
by electric generators, but can also
be supplied by chemical sources
such as electric batteries. Electric
power is generally supplied to
businesses and homes by the electric
power industry.

9. There is a great variety of steel
poles on the market from which a
proper choice for a particular
installation can be made. They
may be a tabular form iron,
laticced steel construction, or
expanded H sections, the laticced
type and expanded H sections
being the most common. Each
installation being more or less a
problem of its own, but in general
three classes may be recognized.

10. Double-circuit strain towerAngle tower

11. Steel-pole line Double circuit pole line

12. Single circuit line Double circuit suspension tower

13. Typical flexible towerErecting a tower in halves

14. Method of erecting steel tower

15. Transmission Line Tower for providence river crossing.

16. Transposition Tower

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