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Unformatted text preview: Module B4 Problem 1 Consider the power system shown below. Choose a system power base 100MVA and a linetoline voltage base for section 1 as 6.9kV. The load in section 3 consumes 10MVA at 0.8pf leading when the linetoline voltage at the load is 13.8kV (a) Determine the ohmic value of a R+jX load (R and X connected in series, as shown) in section 3 that consumes this same amount of power at the specified voltage level (i.e., that consumes 10 MVA at 0.8 pf leading at 13.8kV linetoline). (b) Compute the impedance base for the section 3 load. Solution to problem 1 (a) ( 29 ( 29  = + = = = 426 . 11 235 . 15 6 . 8 . 10 10 10 8 . 13 6 2 3 2 2 j j S V Z Z V S LL LL (b) 015 . 70 8 . 6 9 . 6 9 . 6 2 = = BASE V ( 29 = = = = = 8519 . 1 10 608 . 13 608 . 13 71 8 . 13 015 . 70 2 3 2 3 3 BASE BASE BASE BASE BASE S S V Z V Problem 2 Consider the power system shown below. Choose a system power base of 100MVA and a linetoline voltage base for section 1 as 6.9kV. Determine the appropriate values of per unit impedance for transformers T1, T2, ad the transmission line....
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This note was uploaded on 04/06/2008 for the course EE 303 taught by Professor Mccalley during the Spring '08 term at Iowa State.
 Spring '08
 mccalley
 Volt

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