Page 1
50kW
kW
kVA Telephone Influence Factor
Type Excitation Synchronous Speed
Connections Maximum Overspeed
Efficiency @ 1.0 Power Factor
208/240 480 Number of Bearings
20% Load
87.76 89.1 Insulation System
40% Load 88.26 89.6 Excitation System
60% Load
88.75 90.1
80% Load 88.65 90.0
100% Load 88.45 89.8
100% @ 0.8 PF 88.06 89.4
Subtransient Reactance p.u. 0.17 0.15
Transient Reactance 0.028 0.25
Synchronous Reactance 4.69 4.65 10% 15% 20% 25% 30% 35%
Negative Sequence Reactance
0.41 0.33 26 39 52 65 77 90
Zero Sequence Reactance 0.2 0.18 34 52 69 86 103 120
Short Circuit Ratio
0.38 0.38
Excitation Voltage 170 190
Excitation Current @ 50 kW 4.2 4.8
Lamination Type 390 390
Design and specifications are subject to change without notice.
Date 01/2010
Rev 1
Alternator Ratings (Series Wye Testing)
Machine Parameters @ Max kW Ratings
120 º
80 º
105 º
Temp Rise º C
Class H
<5%
Waveform Distortion
<50
1800 rpm
480
3300 rpm
1 Sealed Ball
Class H
50
kW Rating
Termperature
Rise is based
40º C Ambient
Temperature Rise vs Output (0.8 pf)
Options - - - - - - - - - - - -
Voltage
Instantaneous Voltage Dip
208, 240
37
42
Machine Parameters Continued
50
62.5
Dir/Brusls
12 Lead
208/480v
ALTERNATOR DECREMENT CURVE
100
1000
0.010.1110100
Seconds
Amperes
Alt Damage
Internal Control shutdown
3-Ø Short Circuit Current
All data at 480 Volt Direct Exc
Alternator Data
Information contained in this publication may be considered confidential.
Discretion is recommended when distributing.
Materials and specifications are subject to change without notice.
© 2010 Caterpillar
All rights reserved.
Printed in U.S.A.
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