Transmission Lines
Content
Transmission
and distribution lines there is a difference
INFORMATION SHEET
Western Power is responsible for the safe, efficient and reliable
distribution of electricity in the South-West Interconnected
System (SWIS).
Western Power is responsible for transmitting electricity from
power generators and physically connecting electricity to
properties (homes, offices and factories) and for maintaining and
upgrading the network.
Can I receive electricity from a transmission line?
Homes and businesses cannot receive electricity from a
transmission line because the voltage is too high. Before
electricitry is suitable for consumption at homes and
businesses, a substation and a transformer must convert it to a
suitable voltage.
How is electricity transported?
Transmission Lines
Transmission lines are used to transmit
high-voltage power from various generators
(such as power stations and wind farms) to
over 140 major substations. Transmission
lines enable large amounts of power to be
transported efficiently over longer distances.
This means the amount of power lost during
transportation is minimised.
Western Power transmission lines transmit the following voltages:
• 330,000 Volts or 330 kV • 220,000 Volts or 220 kV
• 132,000 Volts or 132 kV • 66,000 Volts or 66 kV
Electricity travels along a conductor (powerline) at close to the
speed of light (300 million metres per second or 1.1 billion
kilometres per hour).
When an appliance (e.g. TV, computer, toaster, kettle) is
switched on, power is instantly transmitted from a power station
through a network to that appliance via a meter box. Although
this occurs instantaneously, a sequence of events takes place to
ensure the delivery of the electricity.
Western Power is responsible for transmitting electricity via
poles and wires from the generators to homes, offices and
factories in the SWIS.
SWIS statistics
Distribution Lines
The distribution side of the network takes
lower-voltage power from substations
and ‘distributes’ it to homes and
businesses. Power is distributed through
a series of interconnected lines that start
at a substation and terminate at one
nearby. These are called ‘feeders’ and
each feeder provides power to an
average of 1200 properties.
Distribution lines carry lower voltages than transmission lines as
they do not have to extend over long distances, but instead
distribute power through local communities. Western Power’s
distribution network uses the following voltage levels:
• 33,000 Volts or 33 kV • 22,000 Volts or 22 kV
• 1,000 Volts or 11 kV • 6,600 Volts or 6.6 kV • 415 Volts
• More than 140 substations convert very high voltage electricity
to lower voltages suitable for the distribution network.
• More than 721,000 poles which if laid end to end, would
stretch from Perth to Sydney and back.
• More than 58,000 transformers transform power into a
suitable voltage for consumption at your home or a business.
• More than 1300 reclosers restore power automatically
when a fault occurs e.g. tree branches or bark brushing
across the wires. Reclosers significantly reduce the length of
power interruptions.
• More than 700 feeders meander through local suburbs and
towns make sure that power is available to properties.
A number of suburbs can be ‘fed’ by one feeder, and a
number of feeders can ‘feed’ power into one suburb or town.
An average of 1,200 properties are connected to a feeder.
August 2007
www.westernpower.com.au
and distribution lines there is a difference
INFORMATION SHEET
Western Power is responsible for the safe, efficient and reliable
distribution of electricity in the South-West Interconnected
System (SWIS).
Western Power is responsible for transmitting electricity from
power generators and physically connecting electricity to
properties (homes, offices and factories) and for maintaining and
upgrading the network.
Can I receive electricity from a transmission line?
Homes and businesses cannot receive electricity from a
transmission line because the voltage is too high. Before
electricitry is suitable for consumption at homes and
businesses, a substation and a transformer must convert it to a
suitable voltage.
How is electricity transported?
Transmission Lines
Transmission lines are used to transmit
high-voltage power from various generators
(such as power stations and wind farms) to
over 140 major substations. Transmission
lines enable large amounts of power to be
transported efficiently over longer distances.
This means the amount of power lost during
transportation is minimised.
Western Power transmission lines transmit the following voltages:
• 330,000 Volts or 330 kV • 220,000 Volts or 220 kV
• 132,000 Volts or 132 kV • 66,000 Volts or 66 kV
Electricity travels along a conductor (powerline) at close to the
speed of light (300 million metres per second or 1.1 billion
kilometres per hour).
When an appliance (e.g. TV, computer, toaster, kettle) is
switched on, power is instantly transmitted from a power station
through a network to that appliance via a meter box. Although
this occurs instantaneously, a sequence of events takes place to
ensure the delivery of the electricity.
Western Power is responsible for transmitting electricity via
poles and wires from the generators to homes, offices and
factories in the SWIS.
SWIS statistics
Distribution Lines
The distribution side of the network takes
lower-voltage power from substations
and ‘distributes’ it to homes and
businesses. Power is distributed through
a series of interconnected lines that start
at a substation and terminate at one
nearby. These are called ‘feeders’ and
each feeder provides power to an
average of 1200 properties.
Distribution lines carry lower voltages than transmission lines as
they do not have to extend over long distances, but instead
distribute power through local communities. Western Power’s
distribution network uses the following voltage levels:
• 33,000 Volts or 33 kV • 22,000 Volts or 22 kV
• 1,000 Volts or 11 kV • 6,600 Volts or 6.6 kV • 415 Volts
• More than 140 substations convert very high voltage electricity
to lower voltages suitable for the distribution network.
• More than 721,000 poles which if laid end to end, would
stretch from Perth to Sydney and back.
• More than 58,000 transformers transform power into a
suitable voltage for consumption at your home or a business.
• More than 1300 reclosers restore power automatically
when a fault occurs e.g. tree branches or bark brushing
across the wires. Reclosers significantly reduce the length of
power interruptions.
• More than 700 feeders meander through local suburbs and
towns make sure that power is available to properties.
A number of suburbs can be ‘fed’ by one feeder, and a
number of feeders can ‘feed’ power into one suburb or town.
An average of 1,200 properties are connected to a feeder.
August 2007
www.westernpower.com.au
