S4L1D-D41 Wdg.
311 - Technical Data Sheet
Standards
Stamford industrial alternators meet the requirements of the relevant parts of the BS 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 AS440 MX341 MX321
S4L1D-D41 Wdg.311
Electrical Data
Insulation System Class H
Stator Winding Double Layer Lap
Winding Pitch Two Thirds
Winding Leads 12
Winding Number 311
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 12.29
50 Hz 60 Hz
Telephone Interference THF<2% TIF<50
Cooling Air 0.83 m³/sec 0.99 m³/sec
Voltage Star 380 400 415 440 416 440 460 480
kVA Base Rating (Class H) for
Reactance Values 300 310 310 290 344 370 375 390
Saturated Values in Per Unit at Base Ratings and Voltages
Xd Dir. Axis Synchronous 3.15 2.94 2.73 2.27 3.60 3.46 3.21 3.07
X'd Dir. Axis Transient 0.20 0.19 0.17 0.14 0.22 0.21 0.20 0.19
X''d Dir. Axis Subtransient 0.14 0.13 0.12 0.10 0.15 0.14 0.13 0.12
Xq Quad. Axis Reactance 2.66 2.48 2.30 1.92 3.09 2.97 2.75 2.63
X''q Quad. Axis Subtransient 0.40 0.37 0.34 0.29 0.40 0.39 0.36 0.34
XL Stator Leakage Reactance 0.07 0.06 0.06 0.05 0.09 0.08 0.08 0.07
X2 Negative Sequence Reactance 0.27 0.25 0.23 0.19 0.28 0.27 0.25 0.24
X0 Zero Sequence Reactance 0.10 0.09 0.09 0.07 0.10 0.09 0.09 0.08
Unsaturated Values in Per Unit at Base Ratings and Voltages
Xd Dir. Axis Synchronous 3.78 3.53 3.28 2.73 4.32 4.16 3.85 3.68
S4L1D-D41 Wdg.311
Time Constants (Seconds)
0.08
0.019
1.7
Ta ARMATURE TIME CONST. 0.018
0.0077
0
C
Stator Winding Resistance (Ra), per
phase for series connected 0.0124
Rotor Winding Resistance (Rf) 1.05
Exciter Stator Winding Resistance 18
Exciter Rotor Winding Resistance per
phase 0.068
PMG Phase Resistance (Rpmg) per
1.9
phase
Positive Sequence Resistance (R1) 0.0155
Negative Sequence Resistance (R2) 0.017856
Zero Sequence Resistance (R0) 0.0155
Saturation Factors 400V 480V
SG1.0 0.31 0.31
SG1.2 1.25 1.25
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 Bearings
SAE Adaptor SAE 0.5, 1 N/A
Moment of Inertia 4.0771 kgm2 N/A
Weight Wound Stator 415 kg N/A
Weight Wound Rotor 361 kg N/A
Weight Complete Alternator 940 kg N/A
Shipping weight in a Crate 1010 kg N/A
Packing Crate Size 155 x 87 x 107(cm) N/A
Maximum Over Speed 2250 RPM for two minutes
S4L1D-D41 Wdg.311
THREE PHASE EFFICIENCY CURVES
50Hz 60Hz
S4L1D-D41 Wdg.311
Locked Rotor Motor Starting Curves - Separately Excited
380V 400V 415V 440V
35
30
25
PER CENT TRANSIENT VOLTAGE DIP
20
15
10
0
0 200 400 600 800 1000 1200 1400
LOCKED ROTOR kVA
416V 440V 460V480V
35
30
25
PER CENT TRANSIENT VOLTAGE DIP
20
15
10
5
S4L1D-D41 Wdg.311
Locked Rotor Motor Starting Curves - Self Excited
380V 400V 415V 440V
35
30
25
PER CENT TRANSIENT VOLTAGE DIP
20
15
10
0
0 100 200 300 400 500 600 700 800 900 1000
LOCKED ROTOR kVA
416V 440V 460V 480V
35
30
25
PER CENT TRANSIENT VOLTAGE DIP
20
15
10
5
S4L1D-D41 Wdg.311
Three-phase Short Circuit Decrement Curve
10000
SYMM. ASYMMETRICAL
CURRENT (Amps)
1000
100
0.001 0.01 0.1 1 10
TIME (secs)
Sustained Short Circuit = 1200 Amps
10000
SYMM. ASYMMETRICAL
CURRENT (Amps)
1000
100
0.001 0.01 0.1 1 10
S4L1D-D41 Wdg.311
Typical Alternator Operating Charts
S4L1D-D41 Wdg.311
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
Series Star (V) 380 400 415 440 380 400 415 440 380 400 415 440 380 400 415 440
50 kVA 330 340 340 320 320 330 330 310 300 310 310 290 280 285 285 270
Hz
kW 264 272 272 256 256 264 264 248 240 248 248 232 224 228 228 216
Efficiency (%) 92.1 92.3 92.6 93.2 92.3 92.5 92.7 93.3 92.7 92.9 93.1 93.6 93.1 93.3 93.4 93.8
kW Input 287 295 294 275 277 285 285 266 259 267 266 248 241 244 244 230
Series Star (V) 416 440 460 480 416 440 460 480 416 440 460 480 416 440 460 480
60 kVA 375 410 415 430 365 400 400 415 344 370 375 390 315 340 345 355
Hz
kW 300 328 332 344 292 320 320 332 275 296 300 312 252 272 276 284
Efficiency (%) 92.4 92.2 92.5 92.6 92.5 92.4 92.7 92.8 92.8 92.9 93.1 93.1 93.2 93.2 93.4 93.5
kW Input 325 356 359 372 316 346 345 358 296 319 322 335 270 292 295 304
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
- 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 must be
referred to applications.
