6.4 The following test results are obtained for a 30, 25 kV, 750 MVA, 60 Hz, 3600 rpm, star-connected synchronous machine at rated speed. I(A) 1500 VLL. (kV) open-circuit test 25 I. (A) short-circuit test 10,000 VLL (kV) air gap line 30 (a) Determine the number of poles of the synchronous machine. (b) Determine the unsaturated and saturated values of the synchronous reactance in ohms and per unit. (c) The short-circuit test is performed at constant field current (1500 A) but at different speeds- 1000 rpm, 2000 rpm, 3000 rpm, and 3600 rpm. Determine the short-circuit current at these speeds. (d) Determine the field current if the synchronous machine delivers rated MVA to an infinite bus at 0.9 lagging power factor.

6.4 The following test results are obtained for a 30, 25 kV, 750 MVA, 60 Hz, 3600 rpm, star-connected synchronous machine at rated speed. I(A) 1500 VLL. (kV) open-circuit test 25 I. (A) short-circuit test 10,000 VLL (kV) air gap line 30 (a) Determine the number of poles of the synchronous machine. (b) Determine the unsaturated and saturated values of the synchronous reactance in ohms and per unit. (c) The short-circuit test is performed at constant field current (1500 A) but at different speeds- 1000 rpm, 2000 rpm, 3000 rpm, and 3600 rpm. Determine the short-circuit current at these speeds. (d) Determine the field current if the synchronous machine delivers rated MVA to an infinite bus at 0.9 lagging power factor.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

Hello, I have a test now and I need to answer in half an hour, and I will work for you like the answerthank you
Answer d,and e
find currents and voltages of the following circuit
Answer to B and C is incorrect. Please fix. Could you show me the correct steps and how to get the correct answer. The correct answers are: B: -649.2mW C: 126.13 uJ
I need a solution within 15 minutes
CHOOSE THE BEST ANSWER
Please show all work and highlight or circle your answers for parts g and h. Thank you
The dynamic part of the state space representation of the following circuit with R₁ = 20 R₂ = 20 L₁ = 0.5H L₂ = 0.25H is O 1. O 2. None of the answers O 3. O 4. O 5. -4 M=1 = 0 R₁ ww -2 [22]=16² 0 0 -0.5 L₁ 5 2 4-6 +64 1₂ In -8 4-6 90+4 = 0 →→ 30 4+4 [²]+[+]¹ -0.25] [142] + [0.25] ¹ L₂ 1/12
What is the value of Rx in k? to be connected in parallel to a 75 k? to reduce the value of total resistance to 10 k?? O 11.7 O 15.7 O 7.5 12.7
perfect, thank you so much but can you give pointers about how to re-draw the circuit as that is the only part i had issues with PLEASE DONT RE-SOLVE IN A DIFFERENT WAY AND JUST USE THE GIVEN SOLUTION AS REFERENCE TO ANSWER MY INQUIRY. i understand the nodal analysis part i dont understand how the figure was re-drawn to this way as i couldnt visualize it so please give pointers and step by step about how to draw the figure and also why was those nodes specifically chosen and how do i know what nodes to choose in the exam. thank you
This is a practice question from my Introduction to Electronics course. Please talk me through the process. Thank you for your assistance.
?Calculate the current across the RI R1=50 R2=100 R3=150 V=120v R1 R2 R3