S1L2-N1 Winding 06 / 706
S1L2-N1 - Technical Data Sheet
Standards
STAMFORD industrial alternators meet the requirements of 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 AVR Power
AS540 Self-Excited / Aux winding
Voltage Regulation ± 1%
No Load Excitation Voltage (V) 13 V
Full Load Excitation Voltage (V) 47 V
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Electrical Data
Insulation System Class H
Stator Winding Double Layer Concentric
Winding Pitch Two Thirds
Winding Leads 4
Winding Number 06 / 706
Number of Poles 4
IP Rating IP23
RFI Suppression EN 61000-6-2 & EN 61000-6-4, refer to factory for others
Waveform Distortion NO LOAD < 2% NON-DISTORTING BALANCED LINEAR LOAD < 5.0%
Short Circuit Ratio 1/Xd
Steady State X/R Ratio 4.52
60 Hz
Telephone Interference TIF<50
Voltage Series 240 240
Power Factor 0.8 1.0
kVA Base Rating (Class H) 36.5 40
Saturated Values in Per Unit at Base Ratings and Voltages
Xd Dir. Axis Synchronous 1.140 1.249
X'd Dir. Axis Transient 0.142 0.156
X''d Dir. Axis Subtransient 0.118 0.129
Xq Quad. Axis Reactance 1.139 1.248
X''q Quad. Axis Subtransient 0.139 0.152
XL Stator Leakage Reactance 0.073 0.080
X2 Negative Sequence Reactance 0.192 0.210
X0 Zero Sequence Reactance 0.006 0.007
Unsaturated Values in Per Unit at Base Ratings and Voltages
Xd Dir. Axis Synchronous 1.573 1.724
X'd Dir. Axis Transient 0.163 0.179
X''d Dir. Axis Subtransient 0.138 0.151
Xq Quad. Axis Reactance 1.173 1.286
X''q Quad. Axis Subtransient 0.167 0.183
XL Stator Leakage Reactance 0.082 0.090
X2 Negative Sequence Reactance 0.230 0.252
X0 Zero Sequence Reactance 0.007 0.008
Time Constants (Seconds)
T’d TRANSIENT TIME CONST. 0.032
T’’d SUB-TRANSTIME CONST. 0.002
T’do O.C. FIELD TIME CONST. 0.183
Ta ARMATURE TIME CONST. 0.013
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Resistances in Ohms (Ω) at 220C
Stator Winding Resistance (Ra) 0.051 Ω per phase series connected
Rotor Winding Resistance (Rf) 1.04 Ω
Exciter Stator Winding Resistance 14.6 Ω
Exciter Rotor Winding Resistance 0.118 Ω per phase
Positive Sequence Resistance (R1) 0.064 Ω
Negative Sequence Resistance (R2) 0.074 Ω
Zero Sequence Resistance (R0) 0.064 Ω
Aux Winding Resistance (with 2.382 Ω
winding 706 only)
Mechanical data
Cooling Air 0.212 m³/sec (60Hz)
All alternator rotors are dynamically balanced to better than
Shaft and Keys
BS6861: Part 1 Grade 2.5 for minimum vibration in operation.
Bearing Single Bearing
Weight Complete Alternator 189.5 kg
Weight Wound Stator 79.27 kg
Weight Wound Rotor 73.46 kg
Moment of Inertia 0.3314 kgm2
Shipping weight in a Crate 237 kg
Packing Crate Size 1050X570X960 mm
Maximum Over Speed 2250 RPM for two minutes
Bearing Drive End N/A
Bearing Non-Drive End Ball Bearing, 6306-2RS1
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Single Phase Efficiency Curves
60Hz
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Locked Rotor Motor Starting Curves
60Hz
Transient Voltage Dip Scaling Factor Transient Voltage Rise Scaling Factor
PF Factor
< 0.5 1.00 For voltage rise multiply voltage dip by 1.25
0.5 0.97
0.6 0.93
0.7 0.90
0.8 0.85
0.9 0.83
1.0 0.80
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Short Circuit Decrement Curve
Note: Applicable only for Winding 706( Auxiliary winding).
Winding 06(no Auxiliary winding) will not provide short circuit capability.
60Hz
Sustained Short Circuit = 456 Amps
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Typical Alternator Operating Chart
240V/60 Hz
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RATINGS AT 0.8/1.0 POWER FACTOR
Class - Temp Rise Standby - 163/27°C Standby - 150/40°C Cont. H - 125/40°C Cont. F - 105/40°C
60 Series (V) 240 240 240 240 240 240 240 240
Hz Power Factor 0.8 1.0 0.8 1.0 0.8 1.0 0.8 1.0
kVA 40.6 44.4 38.6 42.3 36.5 40.0 33.0 36.2
kW 32.5 44.4 30.9 42.3 29.2 40.0 26.4 36.2
Efficiency (%) 82.8 85.8 83.3 86.2 83.9 86.8 84.6 87.5
kW Input 39.2 51.8 37.1 49.0 34.8 46.1 31.2 41.4
De-Rates
All values tabulated above are subject to the following reductions:
- 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.
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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