In
India we have the following supply systems:
DOMESTIC
CONSUMPTION [single
phase]
Voltage
(V) – 240 (+/- 6%)
Frequency
(f) – 50 (+/- 3%)
INDUSTRIAL
CONSUMPTION [3-phase]
Voltage
(V) – 415 (+/- 6%) [Phase – Phase]
Frequency
(f) – 50 (+/- 3%)
MULTISTORY
BUILDINGS
Voltage
(V) – 415 (+/- 6%)
Voltage
(V) – 240 (+/- 6%) [Phase – Neutral]
Frequency
(f) – 50 (+/- 3%)
DISTRIBUTION SYSTEM
The
part of power system which distributes electric power for local use is known as
distribution system.
IMPORTANT TERMS IN DISTRIBUTION SYSTEM
BUSES
The
network nodes being referred as buses.
FEEDER
1.
The feeder may be defined as the line carrying power from the secondary
sub-station to the distribution sub-station.
[OR]
'Feeder'
is a line which supplies a point of distribution network, without being
tapped at any intermediate point.
In
the definition the expression 'without being tapped at any intermediate
point' means that feeders are not tapped at any intermediate point to give
supply for direct use to consumers.
DISTRIBUTOR
'Distributor'
is a line from which tappings are taken along its length to provide supply to
various consumers.
The
distributor is supplied from a distribution sub-station where a high voltage
(11 KV) is stepped down to a much lower distribution voltage (415V and 240V)
for domestic, commercial and industrial use.
SERVICE MAINS
Service
mains is generally a small cable which connects the distributor to the consumer’s
terminals.
TYPES OF FEEDERS
(a)
OVERHEAD (OH) FEEDER
1. High voltage
transmission is carried out by the OH system.
2. This system initial
cost is low.
3. This is system
is common used in rural areas and identification of fault location is easy.
(b)
UNDERGROUND (UG) FEEDER
1.
This system is more safe, free from interruption of service on account of
thunderstorms and lightning.
2.
This system initial cost is high.
3.
This system is mostly used in cities and identification of fault location is very
difficult.
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