Power System Analysis Assignment 2022

ASSIGNMENT
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POWER SYSTEM ANALYSIS
PLANNING, DESIGN AND OPERATION OF A SUBSTATION:
PROJECT SUMMARY
Introduction to the Consultation and the Project
The Government is committed to encourage more housing in surrounding areas of Melbourne
support the population growth. Estimated 37,000 lots of land will be developed over 30 years to
accommodate around 100,000 people in the areas such as Tarneit, Truganina, Hoppers Crossing,
Werribee, Wyndham Vale, Little river, Laverton, Williams Landing and Point cook as shown in
Figure 1.
Each of these new suburbs not only consists of houses but also includes commercial facilities to
support the locality. However, existing small or medium size industry can be continue running.

The Need for a Substation
The proposed Substation is required to provide reliable power for the proposed housing project
meant to reduce congestion in the populated areas.
The purpose of the Project is to increase electric distribution system capacity and
improve reliability in the region by establishing a new bulk-power substation in the
proposed section of town. The existing substations system configuration will not
meet the Town’s growing electric demand and future reliability needs. Substations change the
voltage of electricity to levels suitable either for transmission over long distances or for
distribution to local communities. Substations provide the ability to switch electricity flow onto
different circuits to allow maintenance and other works on the network and also to regulate the
distribution of power. They are fenced compounds that typically include: transformers;
switchgear; support structures, a control building and overhead line towers.
When electricity is generated (11 – 22 kV), it is converted to a higher voltage (132 – 400 kV) to
reduce losses in transmission over greater distances. The higher voltages are transmitted and then
again stepped down to levels usable b the consumer. Transformers inside this substation are used
to connect the consumers to the transmission system.
SUBSTATION DESCIPTION
The substation you are designing is for one of those suburbs which is located approximately
5km away from nearest HV Sub-transmission line (66kV). This line is used in the substation.
For the reliable supply of power to the load, each substation will connect from two different
sources or from two different sub-transmission/transmission network. This redundancy is
required for power security and reliability.
The design capacity of this substation will be based on expected load in that area. Comparing to
the similar nature of suburbs a residential load is considered as 1.8 kW at (0.9) pf lagging as peak
demand. Commercial load and industrial load peak demand was considered as 400 kW at 0.825
pf lagging and industrial load peak demand is 620 kW at 0.8pf lagging.
The residential loads are connected from LV Residential Feeders from this substation at 415V.
Residential loads are single phase. Each Residential Feeder can accommodate maximum of 500
homes. Commercial and industrial loads are 3 phase and connected from two separate feeders at
11kV line to line voltage. A typical schematics of substation for this suburb is shown below.
There are 2500 residential home and 4 commercials and 2 industrial loads are already available
in that suburb. Due to the development growth, the new built-up area will accommodate
additional 1500 homes, 2 commercials and 1 industrial load.