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Question1: (35marks)

Thefollowingtableprovidessinglecorecopperconductors,PVCinsulatedcable.

Fora3phase,380V,150kWsynchronousmotorwitha0.8763p.flaggingwhichis locatedina location 150 m away from the power generation station:

1. Calculate thesize of asuitablePVCinsulated aluminum cableanddiscussusing the available cable, should we start the motor using start-delta (Ist=3 IFL) or VFD (Ist= IFL) ? (10marks)

Table1:Physicalandelectricalpropertiesofcopperconductorcables

1. OpenthegivenCablesizingpfd fileinPowerFactorysoftware.UsingExportin power factory and make sure activate it.

Figure1

Youneedtoverifyyourcalculation inQuestion1(a)withthegivenmodel.Changethevalues of motor and cable as per your calculation. You MUST add screenshots for the changed motor power output page (as shown in Figure 2) and cable parameters page (as shown in Figure 3). ? (10 marks)

>Changethemotorpoweroutputasthegivendata.Instructionsaregivenasfollows:

Figure2

>Changethelinedataasperyourcalculation.InstructionsaregivenasshowninFigure3.

Figure3

ClicktheCalculateLoadFlow>ExecuteasshowninFigure4:

Figure4

1. Clarify the cable loading (in %) and Amps value, and voltage (voltage drop) at motor connectionpointandverifywithyour (10marks)
2. Explainifthereisanydiscrepancyinthesimulatedandcalculatedvaluesand(5marks)

Question2: (35marks)

SeriesandShuntcompensationandpowerfactorimprovement:

1. Shuntcompensation:OpenthegivenSeriesandShuntpfdfileinPowerFactory software. You will find the following MV/LV network.

Figure5Shuntcompensation

Click Calculate Load flow as shown in Figure 4.You willfind that the voltages at pointsare not within 2% of its nominal value. You can check the nominal value by double-clicking the particular bus (line-line and line-ground value). Adjust the capacitor value and its location at Terminal(1) and Terminal(2) to determine the capacitor size to increase the voltage so that the value is within 2% of its nominal value.

1. Drawatableforcapacitanceandbusvoltagesfordifferentvaluesof(10marks)
2. Provideascreenshotofthefinalloadflowwhichsatisfiestheconditionof2%ofthenominal (5 marks)

Howtochangethecapacitorvalue:DoubleclicktheShunt/Filter>RatedReactivePower(MVar)and Change the nominal voltage according to the voltage at the point of connection.

Figure6

Howtochangethecapacitorlocation:

Figure7

1. Seriescompensation:Toactivatetheseriesconnectioncircuit,ClickSeriesconnection,

>Activateasshownbelow(left)andnetworkasshownontheright.

Figure8

NowdoubleclicktheSeriesCapacitor>GotoLoadFlowtab>Changethevalueof

Capacitance(inF),beyound1mF.

1. Drawatableforcapacitanceandbus (5marks)
2. Provide a screenshot of the final load flow which satisfies the condition of 2% of the nominal value. (5marks)
3. Explaintheobserveddifferencesforseriesandshuntcompensation. (10marks)

MoreinformationonModellinginPowerfactorycanbefoundinthefollowinglinks-

1. IntroductiontoDigiSILENTpowerfactory-BasicLoadFlowAnalysishttps://www.youtube.com/watch?v=op71zi0e8_Y
2. Load flow analysis using Digsilent Powerfactory https://www.youtube.com/watch?v=uYbcHc-eqm8

Question3:Pre-recordedPresentation (20marks)

Create and submit a Loom video with webcam ON (showing your face) and a screen capture showing how you run the simulation and change different parameters of the model. The video lengthforeachrequestedquestionshouldNOTbemorethan5-minutes.So,practicewellbefore recording.

Guidelines on how to create a Loom video: https://www.loom.com/share/159e007948ce4cb8acfee8a99615f388

Requirements:

• Create a Loom Video: (a) Introduce yourself. (b) Demonstrate how you run the simulation modelandchangeits(c)Analyse/Explain(speak)theprocesswhileyouarerunningthe simulation/changing the parameters.
• Pastethelinkofyourrecordingasaresponsetothecorresponding

Createa5-minutevideodemonstratingthefollowing.

1. Walkthroughthesimulationsetupprocess,explainingeach
2. Runthesimulationwhilenarratingwhatishappeninginreal
3. Analysetheresults,discusskeyobservationsandexplainwhatthedatasignifiesinthe context of the simulation.
4. Provideinsightsorconclusionsbasedonyour

ReflectivePractice: (10marks)

Question4:

1. What skills or knowledge did I gain from this project/task and how can I apply these in the future projects? (5marks)
2. What were the key challenges I faced during this project/task and how did I overcome them? (5marks)

ENDOFASSESSMENT