correntes trifásicas
DESCRIPTION
Correntes Trifásicas. Correntes Trifásicas. A CORRENTE ALTERNADA É GERADA EM GRANDE ESCALA A BAIXO CUSTO. OS GERADORES USADOS SÃO TRIFÁSICOS. POSSUEM TRÊS GRUPOS DE BOBINAS. A ENERGIA É GERADA ATRAVÉS DA INDUÇÃO ELETROMAGNÉTICA. A CADA GRUPO DE BOBINA CHAMAMOS DE FASE. - PowerPoint PPT PresentationTRANSCRIPT
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Correntes Trifásicas
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Correntes Trifásicas
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A CORRENTE ALTERNADA ÉGERADA EM GRANDE ESCALAA BAIXO CUSTO
OS GERADORES USADOS SÃO TRIFÁSICOS
POSSUEM TRÊS GRUPOS DEBOBINAS
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A ENERGIA É GERADA ATRAVÉSDA INDUÇÃO ELETROMAGNÉTICA
A CADA GRUPO DE BOBINACHAMAMOS DE FASE
DEVIDO A SUA DISPOSIÇÃOFÍSICA CADA GRUPO DE BOBINAGERA ENERGIA ELÉTRICA EMMOMENTOS DISTINTOS
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PROVOCANDO UM DEFASAMENTOENTRE AS TENSÕES
A
C
B
A
B
VA
VB
VCC
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INTERLIGANDO UMA DASEXTREMIDADES DE CADA GRUPO DE
BOBINA ENTRE SI, OBTEREMOS O CONDUTOR NEUTRO
A
C
B
Neutro
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AS EXTREMIDADES RESTANTES FORMAM AS FASES
Fase A
Fase B
Fase C
A
C
B
Neutro
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V
NAB
C
127 VVAN = 127 V
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V
127 V
NAB
C
VAN = 127 V
VBN = 127 V
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127 V
V
NAB
C
VAN = 127 V
VBN = 127 V
VCN = 127 V
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220 V
V
NAB
C
VAN = 127 V
VBN = 127 V
VCN = 127 V
UAB = 220 V
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220 V
VUAC = 220 V
NAB
C
VAN = 127 V
VBN = 127 V
VCN = 127 V
UAB = 220 V
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220 V
V
NAB
C
VAN = 127 V
VBN = 127 V
VCN = 127 V
UAB = 220 V
UAC = 220 V
UBC = 220 V
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ENTRE FASE E NEUTRO (Vfn) TENSÃO SIMPLES
ENTRE FASE E FASE (Vff) TENSÃO COMPOSTA
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U = 1,73 x V
A TENSÃO COMPOSTA É 3VEZES MAIOR QUE A TENSÃO SIMPLES
V = U1,73
U U U U U U1,73
1,731,731,73
VV V V
VVV
V
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CIRCUITO ESTRELA
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N
A
B
C
QUANDO AS CARGAS
ESTÃO LIGADAS
ENTRE FASE E NEUTRO
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CIRCUITO ESTRELA
EQUILIBRADO
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A
AA
A
A
B
C
N
0 A
1 A
1 A
1 A
R1
R2
R3 R1= R2= R3
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COM TRÊS CARGAS IGUAIS EM UMCIRCUITO ESTRELA, NÃO CIRCULA
CORRENTE NO CONDUTOR NEUTRO
ASSIM PODEMOS ELIMINAR OCONDUTOR NEUTRO
SEM PREJUÍZO PARA AS CARGAS
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CIRCUITO ESTRELA
DESEQUILIBRADO
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A
AA
A
A
B
C
N
1,73 A
R1
R2
R3 R1= R2= R3
3 A
2 A
1 A
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NO CONDUTOR NEUTRO HÁ UMACORRENTE QUANDO AS CARGAS
SÃO DIFERENTES
NÃO PODEMOS RETIRAR O NEUTRO
• A FASE MENOS CARREGADA SOFRERÁ UMA SOBRETENSÃO
• A FASE MAIS CARREGADA SOFRERÁ UMA SUBTENSÃO
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A
B
C
R1
R2
R3
R1= R2= R3
Subtensão
Sobretensão
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NOS SISTEMAS ELÉTRICOS USAMOS
O ATERRAMENTO
DO CONDUTOR NEUTRO
NO CASO DE INTERRUPÇÃO DO
NEUTRO, ESTE GARANTE O
RETORNO DA CORRENTE PARA
A TERRA
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CIRCUITO TRIÂNGULO(DELTA)
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FA
FB
FC
FA
FB
FC
AS CARGASESTÃO LIGADAS
ENTRE FASESEM UM CIRCUITO
TRIFÁSICO
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