Hydropower MJT series
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Three phase Synchronous and Asynchronous Generators HYDROPOWER APPLICATIONS

HYDROPOWER PLANT GENERATORS MarelliGenerators offers a wide range of solutions for hydropower applications. Our synchronous and asynchronous generators represent the best choice due to their certified quality, their versatile design allowing the generator to be customised to your needs, and to the experience acquired by more than 100 years of production. The undisputed quality proved by all MarelliGenerators products is shown by their high reliability, high efficiency and by their unchanged performance during many years of service. SYNCHRONOUS GENERATORS Power range @ 50 Hz - Low voltage...

MarelliGenerators represents the best know-how within the hydropower field by ensuring our product has outstanding technical features. RELIABILITY • Long life endurance of electrical components and bearings. • Class H insulation system for synchronous and class F for asynchronous generators. Impregnation with polyester resin using the Vacuum Pressure Impregnation (VPI) system. A further protection from any corrosion phenomenon is guaranteed by a tropicalization treatment. • High safety factors to warrant the functionality of generators even in the worst working conditions. HIGH PERFORMANCE...

FRAME SIZES 400 - 710 SYNCHRONOUS GENERATORS: TECHNICAL FEATURES STANDARDS All generators are designed according to the IEC 60034-1, CEI EN 60034-1, BS 4999-5000, VDE 0530, NF 51-100, OVE M-10 and NEMA MG 1.22 standards and can be incorporated in the “CE” marked machinery. AVAILABLE VOLTAGE Generators can be supplied with the following voltage range: • Low voltage (380 - 480 V) • Medium voltage (3.000 - 6.600 V) Voltages not listed can be supplied on request. EXCITATION SYSTEM Generators are self-excited through a brushless type excitation system. The voltage is maintained within ± 0,5% of...

INSULATION Class H standard insulation system allows a maximum winding temperature rise of 125°C referring to an ambient temperature of 40°C. Windings are impregnated with polyester resin using the latest technology (VPI system). An enamel insulator (tropicalization treatment) coats all inner parts of the generator in order to protect it from corrosion. TEMPERATURE SENSORS Generators are equipped with three PT100 temperature sensors (one for each phase) installed into the slots to supervise the stator winding temperature and with a PT100 for each bearing to monitor its temperature (**). To...

SYNCHRONOUS GENERATORS / LOW VOLTAGE kVA rating @ Temperature Rise / Ambient Temp. (°C) Type on request on request on request *: 690 V recommended **: Showed data could change depending on mounting. The rated outputs refer to the following conditions: balanced and non deforming load, altitude below 1.000 m asl, power factor from 0,8 to 1. For values of overspeed greater than as listed, please contact MarelliMotori.

SYNCHRONOUS GENERATORS / LOW VOLTAGE kVA rating @ Temperature Rise / Ambient Temp. (°C) Type on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request *: 690 V recommended **: Showed data could change depending on mounting. The rated outputs refer to the following conditions: balanced and non deforming load, altitude below 1.000 m asl, power factor from 0,8 to 1. For values of overspeed greater than as listed, please...

SYNCHRONOUS GENERATORS / MEDIUM VOLTAGE kVA rating @ Temperature Rise / Ambient Temp. (°C) 3000V Type on request on request on request on request on request on request on request on request **: Showed data could change depending on mounting. The rated outputs refer to the following conditions: balanced and non deforming load, altitude below 1.000 m asl, power factor from 0,8 to 1. For values of overspeed greater than as listed, please contact MarelliMotori.

SYNCHRONOUS GENERATORS / MEDIUM VOLTAGE kVA rating @ Temperature Rise / Ambient Temp. (°C) 3000V Type on request on request on request on request 6.000 6.700 8.100 9.000 9.600 on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request on request **: Showed data could change depending on mounting. The rated outputs refer to the following conditions: balanced and non deforming load, altitude below 1.000 m asl, power factor from 0,8 to 1. For values of overspeed...

SYNCHRONOUS GENERATORS / OVERALL DIMENSIONS [mm] Mounting: IM B3 - Air cooled (IC01)

SYNCHRONOUS GENERATORS / OVERALL DIMENSIONS [mm] Mounting: IM B3 - Air-to-water heat exchanger (IC81W) Dimensions for 450 frame size on demand Mounting: IM V10 - Air-to-water heat exchanger (IC81W) Dimensions for 450 frame size on demand ®

FRAME SIZES 250 - 630 ASYNCHRONOUS GENERATORS: TECHNICAL FEATURES STANDARDS All generators are designed according to the IEC 60034-1 and CEI EN 60034-1 standards and can be incorporated in the “CE” marked machinery. AVAILABLE VOLTAGE Generators can be supplied with nominal voltages from 380 V up to 690 V. Voltages not listed can be supplied on request. ENVIRONMENTAL CONDITIONS Rated outputs refer to an installation height up to 1.000 m asl and to a maximum ambient temperature of 40°C. For higher altitudes and different temperature values the rated outputs must be recalculated using the...

EQUIPMENT Standard • Class F insulation • VPI impregnation type • Windings protected against corrosion (tropicalization) • Six-leads stator winding into the terminal box • N° 3 PTC into the stator winding • IP 23 index of protection • IP 55 index of protection for the terminal box • Bearings: more than 100.000 h life time Electric options Class H insulation type N° 3 PT100 into the stator winding N° 1 PT100 on each bearing Anti-condensation heaters In-terminal-box measurement transformers Encoder Tachometric dynamo Mechanical options Inlet and outlet air filters (IP 44) Air-to-fresh water...