ee341_h03_Wi2012 - ECE 341 HW3 Winter 2012 Problem 1 A...

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ECE 341 HW3 Winter 2012 Problem 1: A three-phase line feeds three balanced three-phase loads that are connected in parallel. The first three-phase load is absorbing a total of 156 kW and 117 kVAr. The second three-phase load is delta connected and has a phase impedance of 144-j42 ohm. The third three-phase load is at 115kVA at 06 PF leading. The line impedance between the source and the load is 0.6+j0.3 ohm. If the line to neutral voltage at the load end of the line is 2400 V. What is the magnitude of the line- line voltage at the source? (8 pts.) ) ( t v a ) ( t v b ) ( t v c A N V AN =2400 V 0.6 + j3.0 ohm Load 1 Load 2 Load 3 V ab =? V Problem 2 : (1-21 of the textbook) A linear machine has a magnetic flux density of 0.5 T directed into the page, a connection resistance of 0.25 , a bar length l = 1.0 m, and a battery voltage of 100 V. (a) What is the initial force on the bar at starting? What is the initial current flow? (2 pts.) (b) What is the no-load steady-state speed of the bar? (3 pts.) (c)
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