cost ofcabte inctuding instattation

Assignment 1 . A 2—conductor cable I hm tong is required to suppty a constant current of200Athroughoutthe year. The cost ofcabte inctuding instattation is $3.5..- (20 a + 20) permetre where ”a ’ is the area ofX—section of the conductor in cm2. The cost of energy is5Pper MW: and interest and depreciation charges amountto 10%. Catcutate the most economicat conductor size. Assume resistivity of conductor materiat to be 1-73 u 52cm. 2. The cost of a 3—phase overhead transmission tine is iii (25 000 a + 2500) per tonwhere ‘a ’ is the area ofX—section of each conductor in cm2. The tine is supphging atoad of 5 MW at 33k]? and 0-82.17 tagging assumed to be constant throughouttheyear. Energy costs 4Pper kWh and interest and depreciation totat I 0%per annum. Find the most economicat size of the conductor. Given thatspecific resistance ofconductor materiat is 1 0—6 52 cm.

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