{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Homework 03

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

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

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.

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

View Full Document
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

• 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.

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

• 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.

Dana University of Pennsylvania ‘17, Course Hero Intern

• 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.

Jill Tulane University ‘16, Course Hero Intern