principios de generación de voltaje
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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