unit 9-kaedah sambungan 3 fasa

KAEDAH SAMBUNGAN 3 FASA

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

Beban

Beban

Beban

R, Talian Merah

N, Talian Neutral

B, Talian Biru

Y, Talian Kuning

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

R

B

Y

N

VL

VP= EYN

VL

VL

VP= EBN

VP= ERN

Voltan talian = Voltan Fasa

3

VL = VP

3

Arus Talian(*Line current), IL

Arus yang mengalir dalam talian

Arus Fasa (*Phase current), IP

Arus yang mengalir dalam fasa

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

Juga dikenali sebagai sambungan Jaring

Mempunyai 3 dawai pengalir sahaja Talian Merah, R Talian Kuning, Y Talian Biru, B

Beban selalunya seimbang (sama magnitud)

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

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

Arus Talian = Arus Fasa

3

IL = IP3

Voltan Talian = Voltan Fasa

VL = VP

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

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

Kuasa Aktif (*Active Power) (W) Kuasa Aktif setiap Fasa,

Kuasa Aktif dalam Sistem 3Φ

cosPPP IVP

PPP X 33

cos33 PPIVP

3P cos3 LLIV

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

Gambarajah Segitiga Kuasa

S = VI

P

Q

Θ

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.

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.