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SF6负荷开关的应用
SF6电器生产及过程中的毒害问题
环网供电及负荷开关应用浅析
负荷开关在电网改造中的应用对比
Underground Power Project

Underground Distribution Switchgear
Outdoor Distribution
15.5 kV through 38 kV

Underground Power:What you need to know

Background
The Government of Western Australia has a long-term goal to
supply underground power to at least 50% of homes in Perth by
2010. The program most applicable to the City includes the
conversion of older established areas, such as Como East, to
underground power under the State Underground Power
Program.
The State Underground Power Program (SUPP) is a State
Government initiative administered by the Office of Energy. Local
Governments are invited to nominate areas to be converted to
underground power. Each nomination is assessed against social,
economic and technical criteria by the SUPP Steering Committee.
The cost of each project is generally shared between the State
Government, Western Power, and the Local Government through
the property owner.
Further details of the SUPP may be obtained from the Office of
Energy website by visiting www.energy.wa.gov.au
The benefits
The City is fully-supportive of installing underground power
throughout the locality, and considers the enormous immediate
and long-term benefits to individual property owners and the
community significantly outweigh the costs involved.
The many community and individual benefits include:
Fewer power supply interruptions caused by bad weather,
pole top fires, trees, birds, vandals and car accidents:
Underground power will greatly improve the reliability and
quality of your power supply, and eliminate power supply faults
that may be caused by storms, broken tree branches, bird activity,
vandalism, equipment failure and motor vehicle collisions with
poles.
Improved street appearance: Underground power will enhance
the appearance of your streetscape through the removal of above
ground poles and power lines. The removal of the poles and
power lines will also enable your street trees to grow larger with
less aggressive pruning also adding to the appearance of your
street.
Improved property values: The removal of poles and power
lines and the subsequent improvement of streetscapes has
previously demonstrated a favourable increase in property values,
as the area becomes more desirable and attractive to live in. Some
areas have demonstrated between $5,000 and $10,000 increase in
property values that could be attributable to the installation of
underground power.
Brighter, safer streetlights: New street lighting will also be
installed as part of the underground power project. Brighter and
more effective street lighting can help deter criminal activity and
contribute to improvements in road safety.
Less tree pruning: Street trees will become more attractive
without the aggressive pruning required to keep foliage clear of
overhead power lines.
Reduced power supply surges: Power surges resulting from
overhead power faults which can damage sensitive electrical
equipment and appliances will be reduced.
A safer public environment: Created through the reduction of
personal safety hazards caused by fallen or broken wires, pole top
fires and people pruning trees near power lines.
Underground power is significantly more reliable than overhead
power. However, it does not eliminate power interruptions
altogether. Underground cables and equipment can develop faults
or be damaged, or there may be a fault on an overhead section of
the network that feeds the underground area.
Costs to property owners
The cost of undergrounding power lines in Como East through the State
Underground Power Program will be shared between the State Government,
Western Power, and the City of South Perth through a service charge on each
property owner.
The current estimate for undergrounding the power lines in Como East based
on the experience of other Round Three Projects is between $9.5M and
$11.0M.
The State Government and Western Power contribute 50% towards the costs
of installing underground power to your property. As such, to participate in
the underground power project, property owners could be expected to pay in
the vicinity of $2,800 to $3,400 for a typical single residential home. This
figure may be less for units and properties with applicable discounts.
The total cost of converting to underground power is divided into two
components as follows:
Network charge
The network charge provides for the cost of installing the new underground
power network such as transformers, switch gear and new street lighting. It
also includes the cost of removing the old overhead system.
The network charge has been determined by dividing the load capacity of the
network by the average anticipated load for the property classes ranging from
single residential to single bedroom flats/apartments, and also commercial
properties both large and small. Accordingly the network charge for a single
residential property is anticipated to be in the range $2,200 to $2,800 and
dependent on the overall actual cost of the project.
Service connection charge
The service connection charge is a standard charge under the program for the
connection of power on private property from the meter board to the service
pillar located at the front of the property boundary. After the 50%
Government subsidy is applied, the standard charge payable by the property
owner is expected to be $600 per connection. Concessions will apply for
properties that already have an internal underground connection.
Total estimated cost to property owners
Therefore the total cost (Network Charge + Service Connection Charge) a
property owner could expect for a typical single residential property is
estimated between $2,800 and $3,400.
Commercial, large multiple residential
and non-rateable properties
Charges for commercial, large multiple residential and non-rateable properties
will be individually assessed with costs based on the electrical demand of the
property, therefore the amount payable will vary for each property.
These The proposed project area, Como East is shown on the back of
this newsletter and includes 2,410 properties. Please note the
boundaries of the project area may be subject to minor changes.
Western Power is responsible for managing the on-ground work
for the Underground Power Project, with the work itself
generally carried out by contractors.
Transmission lines
Western Power has high voltage transmission lines in the Como
East project area that affect a small number of properties. The
transmission lines run east along Thelma, south along Morrison
and then Bruce, east on Henley and south-east along Goss to
Manning Road. These lines are not included in the
Underground Power Project, due to the high cost of placing
these services underground. However, all other distribution
high and low voltage poles, lines and services would be
removed from these streets. A discount in the network charge
will be applicable to properties with front boundaries directly
facing the transmission line. The transmission lines are marked
in blue on the project area map.
Disruption caused by works
It is anticipated all underground cable will be installed by
below-ground boring methods, which generally reduce the
amount of disruption on street verges and inside the front
gardens of properties. The projects are generally planned so that
holes are left open for the shortest possible time. There is also
an effort to avoid damaging footpaths and crossovers, and
ensure holes are a safe distance from tree roots. Street verges
will be reinstated as closely as possible to their original
condition.
When the system ‘goes live’, power will need to be off for
about 40 minutes. Western Power will give you ample notice
of when this is going to happen.
House service connections
Existing overhead connections to buildings will be replaced
with an underground service between the meter board and the
service connection pillar, located at the front property
boundary.
Existing overhead single phase connections will be replaced
with underground single phase service connections. Existing
overhead three phase connections will be replaced with an
underground three phase service connection.
Transformers and switchgear
units
On-ground transformers and switch gear units will be used to
replace overhead pole-mounted transformers and switch gear.
Where possible, the transformers have been situated on public
reserves, though it has been necessary to install some units on
street verges. Locations were carefully selected to minimise
inconvenience to property owners. All affected property owners
will be advised shortly.

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