|Power||Up to 6.500 kVA|
|Voltages||Up to 690 V|
|Frame||250 ± 900|
|Poles||4, 6, 8, 10 and 12 |
(over contact MM)
|Cooling||IC 81W/ IC 86W|
|IP||IP 44. Available up to IP 56.|
|Enclosure||TEWAC - Totally Enclosed Water to Air Cooled.|
|Main Applications||Auxiliary generator, Hybrid machine, Off-shore and variable speed generator, Propulsion generator, Shaft generator|
Applicable standardsGenerators are designed in compliance with:
IEC EN 60034 - 1
BS 4999 - 5000
NF 51 - 100
NF 51 - 111
OVE M - 10
NEMA MG 1.32
Generators conform to EU rules.
UL/CSA certifications available on request.
CertificateMarine Survey Certificate supplied with the machine.
Marelli Motori has the ABS design assessment.
Shaft, housing (propulsion) and exchanger are certified by the Marine Classification Society.
HousingRigid frame, rugged welded steel fabrication (EN 10025 - S235 JR).
Frame is provided with side ribs to increase the strength.
Marelli Motori generators for continuous duty operation are designed to meet vibration levels per IEC 60034-14, ISO 10816-1 and BS 5000-3.
ShieldMade of spheroidal graphite cast-iron (EN 1563) or grey cast-iron (EN 1561) up to 630 frame size.
Made of structural steel (EN 10025 – S235 JR) above.
Made in carbon steel and obtained by lamination (EN 10083–2 C40–TN).
Shaft is obtained by forging from 290 mm diameter and above.
The shaft is tested at the manufacturer in order to check it is defect-free.
Double bearing generator: cylindrical shaft with key.
|Main terminal box||
Main terminal boxMounted on side (right or left will be selected).
Made of formable steels EN 10130.
FanMade of aluminum alloy (EN 1706) or structural steel (EN 10025 – S235 JR) depending upon application requirments.
Mounted on top of alternator.
Double tube made of CuNi 90/10.
Copper fins housing.
Equipped with water leakage detector.
Cooling SystemIC 81W as per IEC60034-6. Primary fluid (water) is flowing by external water system. Internal air is flowing by a fan mounted on the shaft of the generator at the driven side.
|Degree of protection||
Degree of protectionIP 44 as per IEC60034-5. (Available up to IP 56)
MountingHorizontal - IM 1001 or IM 1101 as per IEC 60034-7
Stator/Rotor coreLaminated and enamel-insulated on both sides to minimise eddy-current losses.
RotorSalient pole type.
Made by copper flat wire.
H class insulated with enamel coating.
Winding retaining by pass-through bars of high quality steel.
Rotating rectifier: Graetz diode bridge with 6 diodes.
Rotors are dynamically balanced with a half key applied to the shaft extension in accordance with IEC 60034-14 to vibration grade normal A.
Special vibration level construction is available.
Single or double antifriction bearing grease lubricated (ball or roller type) or oil lubricated sleeve bearing.
The theoretical lifetime of bearings, L10h according to ISO 281/1 standard, of standard horizontal construction generators, without external forces (radial and / or axial) is in excess of 50.000 hours. On request, the lifetime of bearings, L10h can be in excess of 100.000 hours.
Locating bearings are on the D end side and floating bearings on the ND end side.
Antifriction bearings up to 560 frame size included.
Sleeve bearings from 630 frame size included (available for smaller frame sizes).
Antifriction bearings can be mounted on 630/710 frame size according to site working conditions.
Regreasing system (for antifriction bearing)
Both bearings are fitted with grease nipple.
ND end bearing can be insulated to prevent any harmful circulating current from passing through the bearing surfaces.
Insulated antifriction bearings in standard configuration:
Dedicated constructions available for different values.
Impregnation systemStator and rotor are VPI treated with an unsaturated polyester amide resin which is polymerised in an oven.
Stator: H class insulated with a synthetic enamel (class F standard for generators with H>=800 or form wound form H=400. Class H option with BH technology).
Rotor: H class insulated with a synthetic enamel.
Protective treatmentsSpecific marine treatment.
Epoxivinilic and polyacrylic. Total minimum thickness 120 micromillimeters.
Epoxivinilic: Epoxy two component products, with vinyl change.
Polyacrylic: Two components polyurethane product formulated with unmodified hydroxyl acrylic resin.
OverloadsDuring continuous duty (S1), the following overloads are allowed:
10% for 1 hour
15% for 10 minutes
30% for 4 minutes
50% for 2 minutes
These overloads must be occasional and followed by one hour of running at normal load or less.
Parallel operationsAll generators are provided with an amply sized damper cage and are suitable for parallel operations with other generators, when equipped with the paralleling unit. A power factor regulator (to work in parallel with the main) is available on request.
Transient ratingsAll generators comply with marine rules regarding transient performance. The voltage drop due to the application of 60% of nominal load is within 15%.
|Three pahse short circuit current||
Three pahse short circuit currentAll generators equipped with an overboosting device ensure a three phase short circuit current (Icc) higher than three times the rated current (In): Icc > 300% In
Radio interferenceAll generators are equipped with Class B Group 1 radio interference filters as defined by EN 55011.
|THD (Total Harmonic Distortion)||
THD (Total Harmonic Distortion)The no-load voltage wave form is sinusoidal with THD content less than 2%.
VibrationsVibration level is in accordance with ISO 10816.
Measurement, evaluation and limits of vibration severity are in accordance with IEC 60034-14.
AVRAutomatic voltage regulator mounted on board.
Space heatersHeaters installed at ND end side.
RTD-PT100RTD devices in standard configuration:
Other configurations available:
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