HYDROPOWER

Technical Specifications

Model :
MJHT
MJT
MJRT
MJHRT
Rated Output (kVA) :
Up to 11,000
Up to 5,200
Up to 5,000
Up to 11,000
Rated Voltage (V) :
Up to 6,600
Up to 690
Up to 690
Up to 15,000
Poles :
From 4 to 20 poles
Cooling :
IC 01
IC 01
IC 81W / IC 86W
IC 81W
Certificates :
Test Certificate supplied with the machine. Material certificates in accordance with EN 10204 : 2001 can be supplied.
Main Terminal Box :
Mounted on side (right or left will be selected.). Model MJT mounted on top. Made of formable steels EN 10130.
IP :
IP 23. Available up to IP 44 with filters.
IP 23. Available up to IP 44 with filters.
IP 44. Available up to IP 56
IP 44. Available up to IP 55
Mounting :
Horizontal - IM 1001 or IM 1101 as per IEC 60034-7. Vertical IM 3011 as per IEC 60034-7 Other mounting available on request.
Stator/Rotor Core :
Laminated and enamel-insulated on both sides to minimise eddy-current losses
Rotor :
Salient 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.
Impregnation System :
Stator and rotor are VPI treated with an unsaturated polyester amide resin which is polymerised in an oven.
Protective Treatments :
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.
Transient Ratings :
All generators can be designed to meet specific SCR. Values can be confirmed by contacting Marelli Motori.
Three Phase Short Circuit Current :
All 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 Interference :
All generators are equipped with Class B Group 1 radio interference filters as defined by EN 55011.
THD (Total Harmonic Distortion) :
The no-load voltage wave form is sinusoidal with THD content less than 2%.
Vibrations :
Vibration level is in accordance with ISO 10816. Measurement, evaluation and limits of vibration severity are in accordance with IEC 60034-14.
*Enclosure:
ODP
ODP
TEWAC
TEWAC
TEAAC

TEAAC – = Totally Enclosed Air to Air Cooled.

TEWAC =  Totally Enclosed Water to Air Cooled.

ODP = Open Drip Proof

Generators are designed in compliance with:

IEC EN 60034-1
BS4999 – 5000
VDE 0530
NF 51 – 100
NF 51 – 111
OVE M – 10
NEMA MG 1.32
Generators conform to EU rules.
UL/CSA certifications available on request.

General data
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.


Shaft Design
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.

MJHT

MJT

MJRT

MJHRT

Stator: F class insulated with a synthetic enamel (class H option
with BH technology).
Rotor: H class insulated with a synthetic enamel.
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.
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.
Stator: F class insulated with a synthetic enamel (class H option
with BH technology).
Rotor: H class insulated with a synthetic enamel.
Model: MJHT Model: MJT Model: MJRT
Frame Size AVR Type Frame Size AVR Type Frame Size AVR Type
400 – 450 MEC 20 analogue/digital 160 – 250 Mark V analogue 250 Mark V analogue
500 – 560 M40FA610A analogue 315 – 450 MEC 20 analogue / digital 315 – 450 MEC 20 analogue / digital
630 – 710 M63FA310A analogue 500 – 560 M40FA610A analogue 500 – 560 M40FA610A analogue
800 – 1,250 MEC 100 digital 630 – 710 M63FA310A analogue 630 – 710 M63FA310A analogue
800 – 900 MEC 100 digital fonts800 – 900 fontsMEC 100 digital
Model: MJHRT
Frame Size AVR Type
400 – 450 MEC 20 analogue / digital
500 – 560 M40FA610A analogue
630 – 710 M63FA310A analogue
800 – 1,250 MEC 100 digital
Digital AVR available for all models and sizes on request.