{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Homework 03 - Spring2011 Homework 3 Due February 9 11...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
ELEN 3441 – Fundamentals of Power Engineering Spring 2011 Page | 1 Homework 3 – Due February 9, 11 3.1. (25 pt.) a 20 kVA, 8000/277 V distribution transformer has the following resistances and reactances: R p = 32 Ω , X p = 45 Ω , R C = 250 k Ω , R s = 0.05 Ω , X s = 0.06 Ω , X m = 30 k Ω . The excitation branch impedances are given referred to the high-voltage side of the transformer. a) Find the equivalent circuit of this transformer referred to the high-voltage side; b) Find the per-unit equivalent circuit of this transformer; c) Assume that this transformer is supplying rated load at 277 V and 0.8 PF lagging. What is the transformer’s input voltage? What is its voltage regulation? d) What is the transformer’s efficiency under the conditions of part c)? 3.2. (20 pt.) A single-phase power system is shown in Figure 3.2. The power source feeds a 100 kVA 14/2.4 kV transformer through a feeder impedance of 38.2+j140 Ω . The transformer’s equivalent series impedance referred to its low-voltage side is 0.12+j0.5 Ω . The load on the transformer is 90 kW at 0.85 PF lagging and the load voltage is 2 300 V.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '10
  • ee
  • Electric power transmission, Electricity distribution, Three-phase electric power, transformer bank, three-phase power transformer

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern