Through discovery, invention, and engineering application,
the engineer has made electricity of continually greater use to mankind.
Electrical power is the driving force to the evolution and improvement of the
world.
One of the efforts and means to achieve this goal is to
transmit power from the generation source to its “ load” in the most economical
and feasible way. This is done via the transmission lines.
Transmission lines are essential for three purposes.
a. To transmit power from a water-power site to a market.
These may he very long and justified because of the subsidy aspect connected
with the project.
b. For bulk supply of power to load centers from outlying
steam stations. These are likely to be relatively short.
c. For interconnection purposes, that is, for transfer of
energy from one system to another in case of emergency or in response to
diversity in system peaks.
Frequent attempts have been made to set up definitions of
“transmission lines, ” “distribution circuits” and “substations.” none has
proved entirely satisfactory or universally applicable, but for the purposes of
accounting the Federal Power Commission and various state commissions have set
up definitions that in essence read:
A transmission system includes all land, conversion
structures and equipment at a primary source of supply; lines, switching and
conversion stations between a generating or receiving point and the entrance to
a distribution center or wholesale point, all lines and equipment whose primary
purpose is to augment, integrate or tie together sources of power supply.
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