S6L1D-H4 Wdg.
312 - Technical Data Sheet
Standards
STAMFORD industrial alternators meet the requirements of the relevant parts of the IEC EN 60034 and the relevant
section of other international standards such as BS5000, VDE 0530, NEMA MG1-32, IEC34, CSA C22.2-100 and
AS1359. Other standards and certifications can be considered on request.
Quality Assurance
Alternators are manufactured using production procedures having a quality assurance level to BS EN ISO 9001.
Excitation and Voltage Regulators
Excitation System
AVR Type MX341 MX321 DECS100
Voltage Regulation ± 1% ± 0.5% ± 0.25% with 4% Engine Governing
AVR Power PMG PMG PMG
No Load Excitation Voltage (V) 14.2 - 15.6
No Load Excitation Current (A) 0.71 - 0.76
Full Load Excitation Voltage (V) 66
Full Load Excitation Current (A) 2.9
Exciter Time Constant (seconds) 0.16
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Electrical Data
Insulation System H
Stator Winding Double Layer Concentric
Winding Pitch 2/3
Winding Leads 6
Winding Number 312
Number of Poles 4
IP Rating IP23
RFI Suppression BS EN 61000-6-2 & BS EN 61000-6-4,VDE 0875G, VDE 0875N.
Refer to factory for others
Waveform Distortion NO LOAD < 1.5% NON-DISTORTING BALANCED LINEAR LOAD < 5.0%
Short Circuit Ratio 1/Xd
Steady State X/R Ratio 27.01
50 Hz 60 Hz
Telephone Interference THF<2% TIF<50
Cooling Air Flow 1.89 m³/sec 2.27 m³/sec
Voltage Star (V) 380 400 415 440 416 440 460 480
Voltage Parallel Star (V) - - - - - - - -
Voltage Delta (V) - - - - - - - -
kVA Base Rating (Class H) for
1335 1400 1400 1340 1481 1569 1638 1694
Reactance Values (kVA)
Saturated Values in Per Unit at Base Ratings and Voltages
Xd Dir. Axis Synchronous 2.14 2.03 1.89 1.61 2.38 2.26 2.16 2.05
X'd Dir. Axis Transient 0.13 0.13 0.12 0.10 0.15 0.14 0.13 0.13
X''d Dir. Axis Subtransient 0.11 0.11 0.10 0.08 0.13 0.12 0.11 0.11
Xq Quad. Axis Reactance 1.86 1.76 1.63 1.39 2.06 1.95 1.86 1.77
X''q Quad. Axis Subtransient 0.28 0.26 0.24 0.21 0.31 0.29 0.28 0.26
XL Stator Leakage Reactance 0.06 0.06 0.05 0.05 0.07 0.06 0.06 0.06
X2 Negative Sequence Reactance 0.17 0.16 0.15 0.13 0.19 0.18 0.17 0.16
X0 Zero Sequence Reactance 0.06 0.06 0.05 0.05 0.07 0.06 0.06 0.06
Unsaturated Values in Per Unit at Base Ratings and Voltages
Xd Dir. Axis Synchronous 2.57 2.44 2.26 1.93 2.86 2.71 2.59 2.46
X'd Dir. Axis Transient 0.15 0.15 0.14 0.12 0.17 0.16 0.16 0.15
X''d Dir. Axis Subtransient 0.13 0.13 0.12 0.10 0.15 0.14 0.13 0.13
Xq Quad. Axis Reactance 1.91 1.81 1.68 1.43 2.12 2.01 1.92 1.82
X''q Quad. Axis Subtransient 0.33 0.31 0.29 0.25 0.37 0.35 0.33 0.32
XL Stator Leakage Reactance 0.07 0.07 0.06 0.05 0.08 0.07 0.07 0.07
Xlr Rotor Leakage Reactance 0.08 0.07 0.07 0.06 0.09 0.08 0.08 0.08
X2 Negative Sequence Reactance 0.21 0.19 0.18 0.15 0.23 0.22 0.21 0.20
X0 Zero Sequence Reactance 0.07 0.07 0.06 0.05 0.08 0.08 0.07 0.07
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Time Constants (Seconds)
T’d Transient Time Const. 0.085
T’’d Sub-Transient Time Const. 0.0145
T’do O.C. Field Time Const. 4.15
Ta Armature Time Const. 0.0189
T’’q Sub-Transient Time Const. 0.0117
0
Resistances in Ohms (Ω) at 22 C
Stator Winding Resistance (Ra),
0.0013
per phase for series connected
Rotor Winding Resistance (Rf) 2.42
Exciter Stator Winding Resistance 19.56
Exciter Rotor Winding Resistance per
0.095
phase
PMG Phase Resistance (Rpmg) per
1.91
phase
Positive Sequence Resistance (R1) 0.0017
Negative Sequence Resistance (R2) 0.0019
Zero Sequence Resistance (R0) 0.0017
Saturation Factors 400V 480V
SG1.0 0.427 0.445
SG1.2 1.808 1.566
Mechanical Data
Shaft and Keys
All alternator rotors are dynamically balanced to better than BS6861: Part 1 Grade 2.5 for
minimum vibration in operation. Two bearing generators are balanced with a half key.
1 Bearing 2 Bearing
SAE Adaptor SAE0,00 SAE0,00
Moment of Inertia 28.237 kgm² 28 kgm²
Weight Wound Stator 1361kg 1361kg
Weight Wound Rotor 1116kg 1073kg
Weight Complete Alternator 2836kg 2962kg
Shipping weight in a Crate 2881kg 3007kg
Packing Crate Size 180x105x153(cm) 180x105x153(cm)
Maximum Over Speed 2250 RPM for two minutes
Bearing Drive End - BALL 6224
Bearing Non-Drive End BALL 6317 BALL 6317
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THREE PHASE EFFICIENCY CURVES
50Hz 60Hz
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Locked Rotor Motor Starting Curves - Separately Excited
50Hz
60Hz
Transient Voltage Dip Scaling Factor Transient Voltage Rise Scaling Factor
PF Factor
< 0.5 1 For voltage rise multiply voltage dip by 1.25
0.5 0.97
0.6 0.93
0.7 0.9
0.8 0.85
0.9 0.83
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Three-phase Short Circuit Decrement Curve - Separately Excited
50Hz
Sustained Short Circuit = 5104 Amps
60Hz
Sustained Short Circuit = 5649 Amps
Note 1 Note 2
The following multiplication factors should be The following multiplication factor should be used to convert the
used to adjust the values from curve between values calculated in accordance with NOTE 1 to those
time 0.001 seconds and the minimum current applicable to the various types of short circuit :
point in respect of nominal operating voltage :
3-phase 2-phase L-L 1-phase L-N
50Hz 60Hz Instantaneous x 1.00 x 0.87 x 1.30
Voltage Factor Voltage Factor Minimum x 1.00 x 1.80 x 3.20
380V X 1.00 416V X 1.00 Sustained x 1.00 x 1.50 x 2.50
400V X 1.05 440V X 1.06 Max. sustained duration 10 sec. 5 sec. 2 sec.
415V X 1.09 460V X 1.10 Note 3 All other times are unchanged
440V X 1.16 480V X 1.15 Curves are drawn for Star connections under no-load
The sustained current value is constant irrespective of
excitation at rated speeds. For other connection (where
voltage level applicable) the following multipliers should be applied to
current values as shown :
Parallel Star = Curve current value X 2
Series Delta = Curve current value X 1.732
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Typical Alternator Operating Charts
400V/50Hz
480V/60Hz
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RATINGS AT 0.8 POWER FACTOR
Class - Temp Rise Standby - 163/27°C Standby - 150/40°C Cont. H - 125/40°C Cont. F - 105/40°C
Star (V) 380 400 415 440 380 400 415 440 380 400 415 440 380 400 415 440
50 Parallel Star (V) N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Delta (V) N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Hz
kVA 1430 1500 1500 1435 1390 1460 1460 1400 1335 1400 1400 1340 1240 1305 1305 1250
kW 1144 1200 1200 1148 1112 1168 1168 1120 1068 1120 1120 1072 992 1044 1044 1000
Efficiency (%) 94.8 94.8 94.9 95.1 94.9 94.9 95.0 95.1 95.0 95.0 95.0 95.2 95.1 95.1 95.2 95.3
kW Input 1207 1266 1265 1207 1172 1231 1230 1177 1125 1179 1178 1126 1043 1098 1097 1050
Star (V) 416 440 460 480 416 440 460 480 416 440 460 480 416 440 460 480
60 Parallel Star (V) N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Hz Delta (V) N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
kVA 1588 1681 1756 1812 1544 1637 1706 1762 1481 1569 1638 1694 1375 1456 1525 1575
kW 1270 1345 1405 1450 1235 1310 1365 1410 1185 1255 1310 1355 1100 1165 1220 1260
Efficiency (%) 94.8 94.9 94.9 94.9 94.9 94.9 95.0 95.0 94.9 95.0 95.0 95.1 95.0 95.1 95.1 95.2
kW Input 1340 1418 1480 1527 1302 1380 1437 1484 1248 1321 1379 1426 1157 1225 1283 1324
De-Rates
All values tabulated above are subject to the following reductions:
- 5% when air inlet filters are fitted
- 3% for every 500 meters by which the operating altitude exceeds 1000 meters above mean sea level
- 3% for every 5°C by which the operational ambient temperature exceeds 40°C @ Class H temperature rise
(please refer to applications for ambient temperature de-rates at other temperature rise classes)
- For any other operating conditions impacting the cooling circuit please refer to applications
Note: Requirement for operating in an ambient exceeding 60°C and altitude exceeding 4000 meters (for <690V) or
1500 meters (for >690V) must be referred to applications.
Dimensional and Torsional Drawing
For dimensional and torsional information please refer to the alternator General Arrangement and rotor drawings
available on our website (http://stamford-avk.com/)
Note: Continuous development of our products means that the information contained in our data sheets can
change without notice, and specifications should always be confirmed with Cummins Generator
Technologies prior to purchase.
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