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An internship with Balpara: Distribution design customer funded projects

Vuksan, Nebojsa (2012) An internship with Balpara: Distribution design customer funded projects. Internship Report, Murdoch University.



Distribution systems occupy a prominent role in the definition of a power system. The basic function of a distribution system is to deliver electrical energy from a transmission substation or small generating stations to the customers, transforming the voltages at suitable places. The distribution systems are overhead and underground. This report provides clear design guidelines involved in distribution design projects, both overhead and underground. The report covers three minor projects- soil resistivity test, pole to pillar and UMS pit- and one major project, which is the installation of a 1MVA sole use substation. The report will cover all of the projects, however the major project will be described in more detail.

The minor projects were completed in order to gain experience and knowledge to undertake the more difficult major project. The soil resistivity test was the first minor project. Balpara is equipped with soil resistivity measuring equipment that is proficient in conducting field data capture for particular site areas with rapid response time. Western Power requested soil resistivity testing in review of the EPR calculation necessary due to the upgrade of the pole top transformer from 25kVA/22kV to 63kVA/22kV. The measured data was then forwarded to Western Power to produce a full earthing system design.

The second minor project was designing pole to pillar connection. The client applied for residential supply for the newly subdivided lot consisting of four units. An ADMD calculator was used to determine the maximum power requirements for a proposed subdivision. ADMD calculator indicated 6.2kVA was established to be the maximum demand for each unit. After looking into numerous options of connecting the customer to the distribution network, the most cost efficient option was to provide electrical supply through a new mini pillar.

The third project was the design of an UMS pit. The job was requested by Main Roads WA to supply new traffic lights and traffic light controllers. The most optimum connection to meet the customers demand was to connect the UMS pit to the nearby pole.

The major project involved designing supply for the commercial customer requesting 1000 Amps/phase. The project involved installation of 1MVA non modular package substation, consisting of a 1MVA transformer being installed 70 meters inside the customer’s property and a separate HV switchgear at the front of the lot. The HV switchgear was connected onto the nearby HV network through long runs of 400 HV cable. Due to the connection onto the existing HV network, the design included reconfiguration of the network in order to protect existing distribution equipment.

Upon receiving the client’s application for a particular project, the designer is responsible for confirming the scope of work with the applicant. When the designer gains the required information, the preliminary design stage of the project can commence. During the preliminary design a number of factors have to be investigated for the project to be designed successfully. Dial Before You Dig, Environmental Issues, Transmission Planning, Network Planning, Local Knowledge and a number of other factors have to be investigated and appropriate approvals obtained before commencing the final design. The above factors will be described in more detail in section two of the report. Site visits must be conducted in order to investigate the proposed asset location and any necessary measurements that are relevant to the project. The final design drawing can only be produced once the site visit is completed and preliminary design approvals obtained and any issues resolved. The final design is an A1 or A3 drawing drafted using MicroStation CAD software. The final design drawing includes Western Power and the customer’s scope of work. Once the design is approved by Western Power and the customer accepts the quote, the project can be scheduled for construction.

Item Type: Internship Report (Bachelor of Engineering)
Murdoch Affiliation(s): School of Engineering and Energy
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