Cramaco G2R 400 Serie Manual De Instrucciones página 9

CRAMACO
®
Rev 0
INSTRUCTION MANUAL FOR USE AND MAINTENANCE
SYNCHRONIC MACHINES SERIES G2R 400 FOUR POLES BRUSHLESS
INSTRUCTION MANUAL
1. GENERAL
These instructions have by objective to serve the personal in charged of installing, connecting and maintaining the
generator. Besides this manual gives you instructions about spare parts in case that needs a reparation work.
These generators are according with the norms CEI IEC 60034, VDE 0530, NF C51-100-111 and 112, BS 4999-
5000 complementing other specifications that were not thought when were produced
2. INTRODUCTION TO THE STUDY OF THE SYNCHRONIC "G2R" MACHINE
2.1. CONSTRUCTION
The generator can be divided in a lot of components that provide different functions, that are going to be describe in
the following paragraphs
2.1.1. PRINCIPAL MACHINE
2.1.1.a) Stator
The frame with the stator was made in a welded iron structure. The magnetic core with the winding are host in the
frame. The wires of the winding are inserted one by one in a almost close slot shape. The isolations of the winding
are class H. The winding are firmly fixed and connected to the terminals without intermediate conductors, avoiding a
joint and the possibility of wrong contacts.
2.1.1.b) Rotor
The polar rotor has the excitation's winding. The polar core is made by thin laminations. The damper cage allows
good running, in case of unbalanced loads and parallel operation. The coils edges are supported by axial bars and in
the middle, between the poles, seized with special gags, designed to oppose the centrifugal forces.
2.1.2. EXCITER
2.1.2.a) STATOR
It's a three-phase A.C. rotating armature generator type. It's attached to the shield on the exciter side of the machine.
The laminated stator makes the poles that holds the winding exciter field.
2.1.2.b) ROTOR
The armature of this exciter was put in the axis of the machine, manufactured with thin laminations of metal sheet.
The winding of enamelled wire is a three-phase with a not accessible neutral and feed a rectifier composed by six
diodes connected in star bridge.
The diodes are grouped every 3, in 2 shooting plaques, one positive and other negative, electrically isolated between
them and to ground. Every plaque is connected to the polar rotor excitation winding terminals, and parallel between
them, is installed an over voltage protectors 20K type.
2.1.3. AUXILIARY WINDING OF EXCITATION
Situated on the same slots that the principal stator winding, it has an auxiliary winding which generate a voltage
needed to feed the regulator of voltage in normal running or short-circuit. Isolation specially designed isolate from
the principal winding and ground.
2.1.4 TYPES OF PROTECTION
The normal execution is IP20S/IP23S (DIN 40050)
2.1.5 CONSTRUCTIVE FORM
The three-phase brush less G2R generator type is conformed by the principal machine, in which includes the
auxiliary winding, an A.C. three phase exciter with rotating rectifier and a static voltage regulator.
2.1.6 TERMINAL BOX
Is situated on top of the alternator on the exciter side. The power wire entrance can be done by both sides, right or
left. The terminal box has: the main terminal board and the regulator.
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