Distribution System - Electrical Engineering - Lecture Slides, Slides of Electrical Engineering

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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…..

A^

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.

FEEDERS

DISTRIBUTORS

SERVICE MAINS

Distribution

DISTRIBUTORS

-^

Distributors

are

used

for

current

Tapping

for

the

various

consumers

these

cables

are

generally

having

the

main

street

for

there

route

SERVICE

MAIN

-^

Service

mains

are

the

small

cables

teed

of

off

from

the

distributors

and

taken

into

the

premises

of

the

various

consumers

these

are

low

tension

cables.

BALANCERS

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.

POLE

‐MOUNTED

SUBSTATION

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

H

‐pole

structure

many

times

R.C.C.

Pole

Structure

‐‐Platform

for

transformer

‐‐Transformer

‐‐Pin

‐Type

insulator

‐Jumpers

‐‐Strain

insulator

‐‐Fuses

‐‐Gang

Operating

switch

‐‐P.G.

Clamps

‐Earthing

‐‐Caution

Plates

‐‐Stay

wire

‐Anchor

road

‐Stay

insulators

‐Anti

‐climbing

devices

‐G.I.

Pipe

and

bends

‐V.I.R.

Cable

‐T.P.I.C.

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