A 12470 V wye - 208 V wye, 500 kVA three-phase padmount transformer is connected up to serve four three-phase commercial

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A 12470 V Wye 208 V Wye 500 Kva Three Phase Padmount Transformer Is Connected Up To Serve Four Three Phase Commercial 1 (117.48 KiB) Viewed 68 times

A 12470 V wye - 208 V wye, 500 kVA three-phase padmount transformer is connected up to serve four three-phase commercial customers. Don't use a spreadsheet in this case since you won't have that tool during the exams; show all your work. The customer load characteristics are as follows: Customer # Data Type Customer 1 Maximum Noncoincident kW Demand Daily kWh Consumption 280.0 2324.0 Customer 2 Maximum Noncoincident kW Demand Daily kWh Consumption 240.0 2250.0 Customer 3 Maximum Noncoincident kW Demand Daily kWh Consumption 170.0 1670.0 Customer 4 Maximum Noncoincident kW Demand 180.0 Daily kWh Consumption 1350.0 For commercial customers, assume load diversity factor varies as follows: #Customers 1 2 3 4 5 6 Diversity Factor 1 1.6 1.9 2.1 2.3 2.4 7 8 2.45 2.5 Also assume that this load is balanced three-phase with a load power factor of 0.85 lagging. For this commercial load configuration, then determine for the net transformer load: (a) Maximum Noncoincident Demand in kW (6) Maximum Diversified Demand in kW (c) Energy that would be delivered by transformer in 24 hour period in kWh (d) Load Factor for this net transformer load in percent (e) Utilization Factor for this transformer in percent (1) Minimum transformer size in kVA if objective is to operate below rated kVA. Standard sizes are: 75. 112, 150, 225, 300, 500, 750, 1000, 1500, 2500, 3750, 5000 kVA