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This lecture series is from Electrical Engineering courses. A collection of lectures on all the important topics in EE. These slides covers points such as: Distribution System, Overhead Lines, Underground Cables, Feeders, Distributors, Service Main, Balancers, Pole-Mounted, Substation, Dimensions Of Danger Plate, Ring Distributor
Typology: Slides
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Hello viewers ,in this lecture we shalllearn about the distribution system. Sothat dc as well as ac distribution systemalso
we
shall
discuss
about
The
components
of
a^
pole
mounted
substation and
components
fitted on
lattice steel tower for transmission of aHT
line.
some
insulators
will
also
be
discussed…..
distributor
is^
set
to
the
legal
requirement
that
power
must
be
supplied at a voltage within
6% of the
declared
voltage.,
whereas
a
transmission system is not subject to anysuch restriction. Its voltage can vary asmuch as 10% to 15% due to variation inloads.
any
restriction
in
transmission
system is technical and not legal.
The
transmission system of an area is calledGRID.
The
different
grids
are
inter
connected
through the lines to form a regional gridand the different regional grids are furtherinterconnected
to
form
a
national
grid.
Each
grid
operates
independently.
However power can be transmitted fromone
grid
to
another.
The
maximum
generation voltage in advanced countries is33 kV while that in India is 11 kV. Theamount
of
power
that
has
to
be
transmitted through transmission lines is
The
three
phase
transmission
and
distribution system may consist of Overhead linesUnderground cables
The
main
advantage
of
underground system are that it is lessprone to electric hazards like rain , wind& lightning. and that it does not interferewith other amenities.
-^
-^
The
generators
supplying
a
three
wire
feeder
are
all
connected
in
parallel across the outers, and it istherefore
necessary
to
fix
the
potential of the middle wire midwaybetween
that
of
the
outers,
otherwise voltages will not be equal,unless the currents taken from theouters are equal.
The
substation
consisting
of
a
transformer
and
other
apparatus
installed
on
the
pole
structure
is
known
as
pole
mounted
substation
As
the
name
implies
such
substation
are
installed
on
‐pole
structure
many
times
Pole
Structure
‐‐Platform
for
transformer
‐‐Transformer
‐‐Pin
‐Type
insulator
‐Jumpers
‐‐Strain
insulator
‐‐Fuses
‐‐Gang
Operating
switch
Clamps
‐Earthing
‐‐Caution
Plates
‐‐Stay
wire
‐Anchor
road
‐Stay
insulators
‐Anti
‐climbing
devices
Pipe
and
bends
Cable
Switch
ESTIMATING OF 11KV/440V POLE MOUNTEDOUTDOOR SUBSTATION
M.S.channelfor cross arm
10cm x 5 cm x 1.5mt long
1no
H.T. 11 kVdisc insulatorswith fittings
11kv grade, porcelain body,glazed
3nos
H.T. 11 kVpin insulatorswith fittings
11kv grade, porcelain body,glazed
3nos
Stay setscomplete
Stay clamp ,stay insulator,stay bow, egg insulator
2 sets