Answer Happy

Problem: You are employed by an electric distribution utility which implements the following guidelines to calculate the diversified (coincident) peak demand for large villas served at 600V (each villa has its own 600V/220V transformer): • Illumination: 49% of total connected load • Small Appliance Circuits: 95% of the rated load of the 3 largest single equipment and 38% of the rest of the total connected load. • Fixed Appliance Circuits: 99% of rated load of largest equipment, plus 84% of rated load of the next largest (<= preceding) equipment, plus 65% of the rated load of the next largest (<= preceding) equipment, plus 34% of the total connected load of all the other equipment. • Airconditioning load: 90% of the rated load of the largest equipment, plus 84% of the connected load of the next largest (<= preceding) equipment, plus 52% of all the other equipment. The following are the planned typical loads of large villas in the contemplated distribution area: Lighting: Floor area: 1,250 sqm with a lighting load of 5 Watts/sqm Small Appliances: Vacuum Cleaners / Floor Polishers: 1,100 Watts each unit, 5 units| Various other small appliances: 450 Watts each unit, 6 units Fixed Appliances: Washing Machines - Dryers: 1,250 Watts each unit, 2 units Refrigerator-Freezer/Microwave/Range Oven: 1,150 Watts each unit, 1 units Computer/Security Equipment: 950 Watts each unit, 2 units Radio/Music/TV/Electric Fans/: 95 Watts each unit, 10 units Airconditioning Equipment: Package Type: 10,000 Watts each unit, 10 units Window Type: 2500 Watts each unit, 5 units a) Calculate the diversified (coincident) peak demand in kW (nearest integer) of the villa using the distribution utility's guidelines. b) There are going to be 7 villas to be served at 600V single phase feeders from a three-phase distribution transformer at 4,160/600 line-to-line Volts . Calculate the 3-phase diversified (coincident) peak demand in kW (nearest integer) for each distribution transformer. c) Calculate the corresponding (to item b above) primary (high voltage) line current in amperes (at least 2 decimal places) of the transformer using a coincidence factor of 92%. Assume a uniform power factor of 92.5%.