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)
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
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Please help with explanation for each stage
Transcribed Image Text: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.
mi
(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.
Тг
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