|Power||Up to 11.000 kVA|
|Voltages||Up to 15.000 V|
|Frame||400 ± 1.250|
|Poles||From 4 to 20 poles ( over contact MM)|
|IP||IP 44. Available up to IP 55.|
|Enclosure||TEWAC - Totally Enclosed Water to Air Cooled|
|Main Applications||Cross-Flow turbines, Francis turbines, Kaplan turbines, Pelton turbines, Turgo turbines|
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.
CertificateTest Certificate supplied with the machine. Material certificates in accordance with EN 10204 : 2001 can be supplied.
HousingRigid frame, rugged welded steel fabrication (EN 10025 - S235 JR). Frame is provided with side ribs to increase the strength. Marelli 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.Dedicated shaft design available on request.Special shaft design for direct coupling with runner are available on request.
|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 on application requirements.
Mounted on top of alternator.Double tube made of CuNi 90/10.Copper fins housing.Equipped with water leakage detector.
EnclosureTEWAC - Totally Enclosed Water to Air Cooled
Cooling SystemIC81W 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 55)
MountingHorizontal - IM 1001 or IM 1101 as per IEC 60034-7.Vertical IM 3011 as per IEC 60034-7Other mounting available on request.
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 are available.
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 900 frame size included depending on nominal speed, overspeed and mechanical load on the shaft.
Sleeve bearings available from 400 frame size.
Generators in horizontal mounting and equipped with antifriction bearing include a regrasing system.
ND end bearing can be insulated to prevent any harmful circulating current from passing through the bearing surfaces.Insulated antifriction bearings in standard configuration:
Impregnation systemStator and rotor are VPI treated with an unsaturated polyester amide resin which is polymerised in an oven.
Insulation systemStator: F class insulated with a synthetic enamel (class H option with BH technology).
Rotor: H class insulated with a synthetic enamel.
Protective treatmentsEpoxivinilic 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 a 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 can be designed to meet specific SCR. Values can be confirmed by contacting Marelli Motori.
|Three pahse short circuit current||
Three pahse short circuit currentAll generators equipped with overboosting device ensure a three phase short circuit current (Icc) higher than 3 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.
InertiaAll generators can be designed to meet specific inertia value also through flywheel. Values can be confirmed by contacting Marelli Motori.
AVRAutomatic voltage regulator mounted on board.
Digital AVR available for all sizes on request.
Heaters installed at ND-end side.
RTD-PT100RTD devices in standard configuration:
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