unit 9-kaedah sambungan 3 fasa
TRANSCRIPT
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KAEDAH SAMBUNGAN 3 FASA
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Juga dikenali sebagai sambungan Wai (Y) atau Star
Beban setiap fasa seimbang 4 dawai pengalir,
1 talian neutral, N 3 dawai hidup
Talian Merah, R Talian Kuning, Y Talian Biru, B
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Beban
Beban
Beban
R, Talian Merah
N, Talian Neutral
B, Talian Biru
Y, Talian Kuning
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Voltan Talian (*Line Voltage), VL
Nilai voltan yang diukur antara 2 dawai hidup
Voltan Fasa (*Phase voltage), VP
Nilai voltan yang diukur di antara talian hidup dengan talian neutral
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R
B
Y
N
VL
VP= EYN
VL
VL
VP= EBN
VP= ERN
Voltan talian = Voltan Fasa
3
VL = VP
3
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Arus Talian(*Line current), IL
Arus yang mengalir dalam talian
Arus Fasa (*Phase current), IP
Arus yang mengalir dalam fasa
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R
Y
N
B
IR = IL (Arus talian merah)
IN = IL (Arus talian neutral)
IY = IL (Arus talian kuning)
IB = IL (Arus talian biru)
IBR= IP
(Arus fasa biru)
IYR = IP
(Arus fasa kuning)
IPR = IP
(Arus fasa merah)
Arus Talian = Arus Fasa
IL = IP
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Juga dikenali sebagai sambungan Jaring
Mempunyai 3 dawai pengalir sahaja Talian Merah, R Talian Kuning, Y Talian Biru, B
Beban selalunya seimbang (sama magnitud)
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C
R
B
Y
A
B
Talian Biru
Talian Merah
Talian Kuning
Beban
Beban
Beban
Titik AB, AC, BC ialah titik-titik yang berada dalam bahagian fasa
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Arus dan Voltan dalam sambungan Delta
R
B
Y
I1 = IP
I3 = IP
I2 = IP
IR = IL
IY = IL
IB = IL
VRY = VL = VP
VBY = VL = VP
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Arus Talian = Arus Fasa
3
IL = IP3
Voltan Talian = Voltan Fasa
VL = VP
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Sambungan Bintang Sambungan Delta
Voltan Talian, VL VL = Vb VL = Vb
Voltan Fasa, Vp Vp = VL Vp = VL
Arus Talian, IL IL = IP IL = IP
3
3
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Kuasa Ketara (*Imminent Power)(VA) IP = Arus Fasa VP = Voltan Fasa IL = Arus Talian VL = Voltan
Talian
Kuasa Ketara setiap Fasa, Kuasa Ketara dalam 3 Fasa,
PPP IVS
PSS 33 X
PP IVS 33
LLIVS 33
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Kuasa Aktif (*Active Power) (W) Kuasa Aktif setiap Fasa,
Kuasa Aktif dalam Sistem 3Φ
cosPPP IVP
PPP X 33
cos33 PPIVP
3P cos3 LLIV
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Kuasa Reaktif (*Reactive Power) (VAR) Kuasa Reaktif setiap Fasa,
Kuasa Reaktif dalam sistem 3Φ,
sinPPP IVQ
PxQQ 33
sin33 PP IVQ
3Q sin3 LL IV
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Gambarajah Segitiga Kuasa
S = VI
P
Q
Θ
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Three uniformly impedence which has a resistance of 5Ω and inductance of 0.02H is given a supply voltage of 415V,100Hz. Calculate the value of line current, phase current, line voltage and phase voltage if those three impedence is star connected. Also calculate the sum of imminent power, active power and reactive power.
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Three uniformly impedence which has a resistance of 20Ω and capacitance of 5µF is given a supply voltage of 400V,50Hz. Calculate the value of line current, phase current, line voltage and phase voltage if those three impedence is delta connected. Also calculate the sum of imminent power, active power and reactive power.