Generación Generación dede Potencia y Potencia y Operación en Paralelo de Operación en Paralelo de

GeneradoresGeneradores

OCP Junio 16-20 / 2003

Plan Del CursoPlan Del Curso

Fundamentos Fundamentos DelDel

GeneradorGenerador

Voltage & Current generationVoltage & Current generation

NN

SSStatorStator

CoilCoil

RotorRotor Magnetic fieldMagnetic field

Wave generationWave generation

Time

Vol tage

NN SSNN

SS

NNSS

NN

SS

NN SS

Three phase generationThree phase generation

Time

Vol tage

NN

SS

NN

SS NN

SS

ComponentesComponentesdel Generadordel Generador

SR4

SR4 GeneratorSR4 Generator

main stator winding - AC

output goes to load

main rotor winding - gets DC from rectifiers

exciter rotor winding - AC output goes to rectifiers

exciter stator winding - gets DC

from regulator

NEMA Standard is 10% Max. Cat Generators are 5% Max.

Waveform Deviation

volts

time

HarmonicsHarmonics

third harmonic (10 %)third harmonic (10 %)

voltsvolts

timetime

perfect sine wave (100%)resultant waveform

Fifth harmonicFifth harmonic

Harmonics in The Line-To-Line Harmonics in The Line-To-Line Waveform At Full LoadWaveform At Full Load

See: Figure 2, Page 3 of LEKX3115 “Gen Winding Pitch & Harmonics”

Harmonic 2/3=.667 Pitch 5/6=.833 Pitch3 rd 0.35% 0.10%5 th 2.31% 0.31%7 th 0.35% 0.19%9 th 0.05% 0.03%11 th 0.95% 0.58%13 th 0.39% 0.47%15 th 0.02% 0.04%Total HarmonicContent

2.57% 0.84%

% of fundamental voltage

Slot PitchSlot Pitch

Shape of coils

1

7

5

4

32

6

Slot Pitch=

Coil Throw - 1 Slots/Pole

7-124/4

= = 1 or full pitch

6-124/4

= = 5/6 =.83

Coil NumberingCoil NumberingT1T1

T2T2T3T3

T4T4

T5T5

T6T6

T7T7

T8T8

T9T9

T10T10T11T11

T12T12

Series ConnectionSeries Connection

High Voltage Low AmpsHigh Voltage Low Amps

T3T3

T1T1

T2T2

T4T4

T5T5

T7T7

T8T8

T9T9

T10T10T11T11

T6T6

T12T12

277V277V

480V480V

T0T0

Parallel ConnectionParallel Connection

7T7T

T8T8T9T9

T10T10T11T11T12T12

T1T1

T4T4

T3T3

T6T6

Low Voltage High AmpsLow Voltage High Amps

T1T1

T4T4

T2T2

T5T5T2T2

T5T5T3T3

T6T6

Parallel ConnectionParallel Connection

Low Voltage High AmpsLow Voltage High Amps

T12T12

T7T7

T10T10

T1T1

T4T4

T5T5 T8T8

T11T11

T2T2

T6T6

T9T9

T3T3

T0T0

240 V240 V

139 V139 V

Delta ConnectionDelta Connection

T7T7

T10T10

T8T8T11T11

T12T12

T9T9T6T6

T3T3

T4T4

T1T1

T5T5 T2T2

L1L1

L2L2L3L3

120 V

120 V240 V

208V

4/6 Wire Generators4/6 Wire Generators

T3T3

T1T1

T2T2

T4T4

T5T5T6T6

T0T0