generator

Induced Current in a Generator

bull The effect of inducing a current in a coil by moving a magnet inside itis used for the generation of electricity in power plants

bull There are two types of generator or dynamoBoth turn rotational energy into electrical energy1 One type involves rotating a coil inside a magnet2 The other type involves rotating a magnet inside a coilBoth types produce ALTERNATING CURRENT

bull gcsesciencecom

bull An electric generator consists of a magnet which creates a magnetic field and a loop of wire which rotates in the magnetic field As the wire rotates in the magnetic field the changing strength of the magnetic field through the wire produces a force which drives the electric charges around the wire AS the loop spins the direction of the force changes so too then does the direction of the current The changing direction of the force after every 180 degrees of rotation gives the alternating current

THREE PHASE POWER

bull The power plant produces three different phases of AC power simultaneously and the three phases are offset 120 degrees from each other If you were to look at the three phases on a graph they would look like this relative to ground

CONFORMANCE TO STANDARDS OF GENERATOR

bull IEC 600341 to 6003415bull IS 4722 5422 7132 7306 7816bull BS 4999 5000bull ANSI C5010 C5012 C5013 C5014bull VDE 0530 Parts 123 amp 4bull VDI 2056 2059bull IEEE 115

bull MAIN PARTSbull STATORbull bull ROTOR FORGINGbull bull ROTOR LAMINATIONSbull bull ROTOR WINDINGbull bull FANSbull ROTORbull bull BASE FRAMESTATOR FRAMEbull bull STATOR COREbull bull STATOR WINDINGbull bull ENCLOSUREbull OTHER PARTSbull bull BEARINGSbull bullAIR COOLERbull bullFOUNDATION ITEMSbull bullEXCITER

bull BASE FRAMEbull bull Carries the stator bearings and the

exciterbull bull Transmits forces occurring in the

machinebull to the foundationbull bull Anchored to the foundation with the

helpbull of foundation bolts

STATOR CORE BUILDING

bull ENCLOSUREbull bull Split designbull bull Bottom part rests on base frame and topbull part sits on bottom partbull bull Designed as required for a particularbull degree of protectionbull bull Plays a role ventilation circuitbull bull Output leads hot and cold air RTDrsquosbull Earthing terminals are on bottom part

bull STATOR FRAMEbull bull SPLIT CASE TYPEbull bull SUPPORTS CORE AND WINDINGbull bull MECHANICAL STRENGTH IS IMPARTED BY RADIALbull RIBS AND AXIAL PIPESbull bull SIDE AND BOTTOM MOUNTED COOLERSbull bull TOP OR BOTTOM OUTPUT LEADSbull bullROUND AND RECTANGULAR SHAPESbull bullFIXED TO THE FOUNDATION WITH THE HELP OFbull FOUNDATION BOLTS AND IS DESIGNED TObull WITHSTAND SUDDEN SHORT CIRCUIT TORQUE

GENERATOR FRAME-BOTTOM HALF

GENERATOR FRAME-UPPER HALF

ASSEMBLED CORE

GENERATOR UNDER ASSEMBLY

PLACING THE TUB WITH STATOR IN IMPREGNATION TANK

ROTORbull Consists of shaft laminated core fieldbull winding damper winding windingbull supports fans and slipringsbull Shaft has axial grooves thus forming abull spider shaftbull 2 Nos of Radial fans mounted on eachbull side of rotor for ventilation of

Generatorbull Supported on 2 nos of journal

bearingsbull with one Bearing insulated to eliminatebull passage of shaft currents

bull Rotor coils are of 4 jointsbull typebull 1048657 Semi closed slots withbull side insertion of rotorbull copper stripsbull 1048657 Max size of rotor copperbull with dovetail punchingbull 1048657 Avoiding of tempbull bandage for overhangbull winding only permanent

ROTOR

bull Rotor coils are of 4 jointsbull typebull 1048657 Semi closed slots withbull side insertion of rotorbull copper stripsbull 1048657 Max size of rotor copperbull with dovetail punchingbull 1048657 Avoiding of tempbull bandage for overhangbull winding only permanentbull bandage is used

ROTOR UNDER MANUFACTURING

bull ROTOR SHAFT FOR 2 POLE MCSbull bull FORGED FROM A VACUUM CAST STEEL INGOTbull bull 23RD OF ROTOR BODY CIRCUMFERENCE HASbull LONGITUDINAL SLOTS TO HOLD THE FIELD

WINDINGbull bull ROTOR TEETH ARE PROVIDED WITH AXIAL ANDbull RADIAL HOLES FOR INTENSIVE COOLING OF ENDbull WINDING

RETAINING RINGbull bullNON-MAGNETIC COLD WORKED MATERIALbull bull WITHSTANDS CENTRIFUGAL FORCES DUE

TO THEbull END WINDINGSbull bull SHRUNK FIT HUB REINFORCES RETAINING

RINGbull AND SECURES THE END WINDING IN THE

AXIALbull DIRECTIONbull bull SNAP RING PROTECTS AGAINST AXIALbull DISPLACEMENT OF THE RETAINING RINGbull bull SHRINK SEAT AREA IS SILVER PLATED

Four Flute cooling system forRotor

BEARINGS

bull Cylinderical journal bearingsbull bull Self aligning typebull bull Made in two halvesbull bull Mounted on the pedestal which is also

inbull two halvesbull bull Duplex type RTDrsquos to measure bearingbull temperature

Ventilation Scheme of VPI Generator

View of a VPI 125 MWGenerator

ROTOR INSERTION

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THREE PHASE POWER


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ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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Four Flute cooling system for Rotor

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BEARINGS

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View of a VPI 125 MW Generator

ROTOR INSERTION

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bull An electric generator consists of a magnet which creates a magnetic field and a loop of wire which rotates in the magnetic field As the wire rotates in the magnetic field the changing strength of the magnetic field through the wire produces a force which drives the electric charges around the wire AS the loop spins the direction of the force changes so too then does the direction of the current The changing direction of the force after every 180 degrees of rotation gives the alternating current

THREE PHASE POWER














ASSEMBLED CORE







ROTOR










BEARINGS





ROTOR INSERTION

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THREE PHASE POWER


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ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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BEARINGS

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ROTOR INSERTION

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THREE PHASE POWER














ASSEMBLED CORE







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BEARINGS





ROTOR INSERTION

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THREE PHASE POWER


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ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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BEARINGS

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ROTOR INSERTION

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ASSEMBLED CORE







ROTOR










BEARINGS





ROTOR INSERTION

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THREE PHASE POWER


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ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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BEARINGS

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ROTOR INSERTION

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ROTOR










BEARINGS





ROTOR INSERTION

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THREE PHASE POWER


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ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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BEARINGS

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ROTOR INSERTION

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BEARINGS





ROTOR INSERTION

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THREE PHASE POWER


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ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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BEARINGS

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ROTOR INSERTION

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ROTOR INSERTION

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Slide 2


Slide 4

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THREE PHASE POWER


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Slide 18

ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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BEARINGS

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ROTOR INSERTION

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THREE PHASE POWER


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ASSEMBLED CORE


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ROTOR

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ROTOR


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RETAINING RING

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BEARINGS

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ROTOR INSERTION

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generator

Business

rotor rotor coils

rotor shaft

rotor insertion

field winding rotor

size of rotor copper

rotor body circumference

overhang winding

ventilation of generator