G250LG
Alternator Data
kW
kVA Telephone Influence Factor
Type Synchronous Speed
Connections Maximum Overspeed
Efficiency @ 1.0 Power Factor
208/240 480/600 Number of Bearings
20% Load
88.55 89.9 Insulation System
40% Load
89.34 90.7 Excitation System
60% Load
89.64 91
80% Load 89.73 91.1
100% Load 89.54 90.9
100% @ 0.8 PF 88.75 90.1 191
229
250
Subtransient Reactance p.u.
0.14
Transient Reactance
0.23
Synchronous Reactance
2.05
10% 15% 20% 25% 30% 35%
Negative Sequence Reactance
0.26
197 296 395 494 593 692
Zero Sequence Reactance
0.09
263 395 527 658 790 922
Short Circuit Ratio
0.28
Excitation Voltage
190
Excitation Current @ Rated kW
5.0A
Lamination Type
520
Design and specifications are subject to change without notice.
Date 06-2009
Rev 2
Alternator Ratings (Series Wye Testing)
Machine Parameters @ Max kW Ratings
kW Rating
120 º
80 º
105 º
Temp Rise º C
Class H
1 Sealed Ball
Class H
Alternator Heater
<5%
Waveform Distortion
<50
1800 rpm
Temperature
Rise is based
40º C Ambient
Temperature Rise vs Output (0.8 pf)
Options - - - - - - - - - - - -
Voltage
Instantaneous Voltage Dip
208, 240
480
3300 rpm
Machine Parameters Continued
250
312.5
Brushless/PMG
12 Lead
600
Antifungal Coating
ALTERNATOR DECREMENT CURVE
10
100
1000
10000
0.010.1110100
Seconds
Amperes
lt Damage
3-Ø Short Circuit Current
ll data at 480 volt
PMG
Cutoff
Information contained in this publication may be considered condential. Discretion is recommended when distributing.
Materials and specications are subject to change without notice.
CAT, CATERPILLAR, their respective logos, OLYMPIAN, “Caterpillar Yellow,” the “Power Edge” trade dress as
well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.
www.CAT-ElectricPower.com
© 2009 Caterpillar
All rights reserved.
Printed in U.S.A.
LEHF0052-01 (10/09)
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