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. It (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. It (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

The hardware sytem operate under a static dicipline with the following thresholds VIL=1.3V ,VIH=2.4V,VOL=0.6V and VOH=3.8V compute the noise margin and draw the properly labelled noise margin figure for this system
3. The current that should pass through the RTD is: a. 5.7 mA O b. 10 mA O c. 5 mA O d. 11.5 mA
1
Hi, I need help in this problem. Please provide answers to the sub-questions here. Thank you so much.
i need the answer quickly
i need the answer quickly
The circuit in figure below is High Clock Ck K K K K Q: O MOD-4 asynchronous counter 4-bits asynchronous counter 4-bits synchronous counter O MOD-4 synchronous counter
20
hall sensoreffect
Design the triggered synchronous circuit whose state diagram is given with D Type FF. a=111 b=110 c=101 d=100 e=001 Please explain detaily.
Which of the following circuits works with a periodic clock input? O a. SR Latch O b. Asynchronous sequential circuit O c. None O d. Synchronous sequential circuit O e. Combinational circuit