Question 2 2.1. A factory, having a Maximum demand of 1.22MW, and an annual load factor of 56%, must decide whether to b

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Question 2 2 1 A Factory Having A Maximum Demand Of 1 22mw And An Annual Load Factor Of 56 Must Decide Whether To B 1 (155.41 KiB) Viewed 63 times

Question 2 2.1. A factory, having a Maximum demand of 1.22MW, and an annual load factor of 56%, must decide whether to be supplied with electric power from the Public Utility, or from diesel engine generator, run by themselves. You are an engineer at this factory. Use the information provided and recommend the supply to be used. Public utility tariff: R312-00 per kW, Maximum Demand, (taken over the year) and 95 cents per unit plus, a monthly service charge of R800-00 Oil engine generator: Capital cost: Fuel cost: Fuel consumption: Repair & Maintenance: Interest & Depreciation: Annual wages: R1 200 000-00 R12-00 per kilogram 0.3 kg/unit 0.73 cents per unit generated 12% per year R25 000-00 [14] 2.2 In a High voltage yard, the Capacitor voltage transformer is connected to the bus bar by two wires of very great cross section, considering the current flowing in these conductors is negligible. Justify the use of a large cross section conductor [2] 2.3 A 220kV, 50Hz, 3-phase overhead line. has a conductor effective radius of 26.7mm. The phases are asymmetrically spaced, 8m; 8m, and 16m apart. mo = 0.85, and the ambient temperature is 23°C. The atmospheric pressure is 98.4kPa. NOTE: To find the factor for Atmospheric conditions, using kPa & °C, use: 2.95 x P 8= 273+°C Determine, for this line: 2.3.1 2.3.2 The Disruptive critical voltage. The Visual critical voltage 3 2.3.3 The Corona power loss [2] [25]