S6L1D-D4 Wdg.

13/14 - Technical Data Sheet

Standards

STAMFORD industrial alternators meet the requirements of the relevant parts of the IEC 60034 and the relevant sections
of other international standards such as BS5000-3, ISO 8528-3, VDE 0530, NEMA MG1-32, CSA C22.2-100 and AS
60034. 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 MX321/MX322 MX341 DECS150
Voltage Regulation ± 0.5% ± 1% ± 0.25% with 4% Engine Governing
AVR Power PMG PMG PMG

No Load Excitation Voltage (V) 17.49

No Load Excitation Current (A) 0.95
Full Load Excitation Voltage (V) 46
Full Load Excitation Current (A) 2.5
Exciter Time Constant (seconds) 0.17

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Electrical Data
Insulation System H
Stator Winding Double Layer Concentric
Winding Pitch 2/3
Winding Leads 6/12
Winding Number 13/14
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 19.91
60 Hz
Telephone Interference TIF<50
Cooling Air Flow 1.71 m³/sec
Voltage Series Star (V) 380 400 416 -
Voltage Parallel Star (V) 190 200 208 -
Voltage Delta (V) 220 230 240 -

kVA Base Rating (Class H) for

1000 1000 1000 -
Reactance Values (kVA)

Saturated Values in Per Unit at Base Ratings and Voltages

Xd Dir. Axis Synchronous 1.61 1.45 1.34 -
X'd Dir. Axis Transient 0.13 0.12 0.11 -
X''d Dir. Axis Subtransient 0.11 0.10 0.09 -
Xq Quad. Axis Reactance 1.68 1.52 1.40 -
X''q Quad. Axis Subtransient 0.26 0.24 0.22 -
XL Stator Leakage Reactance 0.06 0.05 0.05 -
X2 Negative Sequence Reactance 0.14 0.13 0.12 -
X0 Zero Sequence Reactance 0.03 0.03 0.03 -
Unsaturated Values in Per Unit at Base Ratings and Voltages
Xd Dir. Axis Synchronous 1.93 1.74 1.61 -
X'd Dir. Axis Transient 0.15 0.14 0.13 -
X''d Dir. Axis Subtransient 0.13 0.11 0.10 -
Xq Quad. Axis Reactance 1.73 1.56 1.45 -
X''q Quad. Axis Subtransient 0.31 0.28 0.26 -
XL Stator Leakage Reactance 0.07 0.06 0.06 -
Xlr Rotor Leakage Reactance 0.08 0.07 0.07 -
X2 Negative Sequence Reactance 0.17 0.16 0.14 -
X0 Zero Sequence Reactance 0.04 0.03 0.03 -
* Parallel Star connection only available with 12 leads winding option

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Time Constants (Seconds)

T’d Transient Time Const. 0.091
T’’d Sub-Transient Time Const. 0.013
T’do O.C. Field Time Const. 3.361
Ta Armature Time Const. 0.021
T’’q Sub-Transient Time Const. 0.0102

Resistances in Ohms (Ω) at 220C

Stator Winding Resistance (Ra),
per phase for series connected 0.00160

Rotor Winding Resistance (Rf) 1.82

Exciter Stator Winding Resistance 18.47
Exciter Rotor Winding Resistance per
phase 0.095

PMG Phase Resistance (Rpmg) per

1.91
phase
Positive Sequence Resistance (R1) 0.0020
Negative Sequence Resistance (R2) 0.0023
Zero Sequence Resistance (R0) 0.0020
Saturation Factors 416V
SG1.0 0.715
SG1.2 2.5
Mechanical Data

All alternator rotors are dynamically balanced to better than ISO 21940-11 Grade 2.5 for
Shaft and Keys
minimum vibration in operation. Two bearing generators are balanced with a half key.

1 Bearing 2 Bearing
SAE Adaptor SAE0,1 SAE0,1
Moment of Inertia 18.99 kgm² 18.46 kgm²
Weight Wound Stator 924kg 924kg
Weight Wound Rotor 800kg 758kg
Weight Complete Alternator 1953kg 2030kg
Shipping weight in a Crate 1996kg 2073kg
Packing Crate Size 160x105x153(cm) 160x105x153(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

60Hz

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Locked Rotor Motor Starting Curves - Separately Excited

60Hz

60Hz

Transient Voltage Dip Scaling Factor Transient Voltage Rise Scaling Factor
Lagging PF Scaling Factor Lagging PF Scaling Factor
<= 0.4 1.00 <= 0.4 1.25
0.5 0.95 0.5 1.20
0.6 0.90 0.6 1.15
0.7 0.86 0.7 1.10
0.8 0.83 > 0.7 1.00
0.9 0.75
0.95 0.70
1 0.65
Note: To determine % Transient Voltage Dip or Voltage Rise at various PF, multiply
the % Voltage Dip from the curve directly by the Scaling Factor.

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Three-phase Short Circuit Decrement Curve - Separately Excited

60Hz

Sustained Short Circuit = 5509 Amps

60Hz

Sustained Short Circuit = Amps

Note 1 Note 2
The following multiplication factors should be The following multiplication factor should be used to convert
used to adjust the values from curve between the 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 Sustained x 1.00 x 1.50 x 2.50
- - 400V X 1.05 Max. sustained duration 10 sec. 5 sec. 2 sec.
- - 416V X 1.09 Note 3 All other times are unchanged
- - - - Curves are drawn for Star connections under no-load
excitation at rated speeds. For other connection (where
The sustained current value is constant irrespective
applicable) the following multipliers should be applied to
of voltage level
current values as shown :
If MX322 or digital AVR is used, the sustained short- Parallel Star = Curve current value X 2
circuit current value is to be multiplied by a factor of Series Delta = Curve current value X 1.732
1.1.

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Typical Alternator Operating Charts

416V/60Hz

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) N/A N/A N/A N/A
50 Parallel Star (V) N/A N/A N/A N/A

Hz Delta (V) N/A N/A N/A N/A

kVA N/A N/A N/A N/A
kW N/A N/A N/A N/A
Efficiency (%) N/A N/A N/A N/A
kW Input N/A N/A N/A N/A

Star (V) 380 400 416 N/A 380 400 416 N/A 380 400 416 N/A 380 400 416 N/A
60 Parallel Star (V) 190 200 208 N/A 190 200 208 N/A 190 200 208 N/A 190 200 208 N/A

Hz Delta (V) 220 230 240 N/A 220 230 240 N/A 220 230 240 N/A 220 230 240 N/A
kVA 1080 1080 1080 N/A 1050 1050 1050 N/A 1000 1000 1000 N/A 910 910 910 N/A
kW 864 864 864 N/A 840 840 840 N/A 800 800 800 N/A 728 728 728 N/A
Efficiency (%) 95.0 95.1 95.1 N/A 95.0 95.1 95.2 N/A 95.1 95.2 95.2 N/A 95.2 95.2 95.2 N/A
kW Input 910 909 908 N/A 884 883 883 N/A 841 841 840 N/A 765 764 764 N/A

* Parallel Star connection only available with 12 leads winding option

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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