Milton CAT G25LTA 25 kW Performance Data: Alternator Data G25LTA User Manual
G25lta, Alternator data, Alternator decrement curve
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G25LTA
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.
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All rights reserved.
Printed in U.S.A.
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
87.07 88.4
Insulation System
40% Load
87.96 89.3
Excitation System
60% Load
88.55 89.9
80% Load
88.45 89.8
100% Load
88.35 89.7
100% @ 0.8 PF
88.85 90.2
19
23
25
Subtransient Reactance p.u.
0.16
Transient Reactance
0.27
Synchronous Reactance
2.85
10% 15% 20% 25% 30% 35%
Negative Sequence Reactance
0.28
12
19
25
31
37
43
Zero Sequence Reactance
0.10
16
25
33
41
49
57
Short Circuit Ratio
0.33
Excitation Voltage
190
Excitation Current @ Rated kW
4.5A
Lamination Type
390
Machine Parameters Continued
25
31.25
Brushless
4 Lead
600
Antifungal Coating
Temperature
Rise is based
40º C Ambient
Temperature Rise vs Output (0.8 pf)
Options - - - - - - - - - - - -
Voltage
Instantaneous Voltage Dip
208, 240
480
3300 rpm
1 Sealed Ball
Class H
Alternator Heater
<5%
Waveform Distortion
<50
1800 rpm
Design and specifications are subject to change without notice.
Date 06-2009
Rev 1
Alternator Ratings
(Series Wye Testing)
Machine Parameters @ Max kW Ratings
kW Rating
120 º
80 º
105 º
Temp Rise º C
Class H
ALTERNATOR DECREMENT CURVE
10
100
1000
0.01
0.1
1
10
100
Seconds
A
m
pe
re
s
Alt Damage
3-Ø Short Circuit Current
All data at 480 volt
LEHF0073-00 (07/09)