# Three phase systems star and delta connections?

Three identical coils each of resistance 50ohms and inductance of 254.6(mH)

Are connected to a 415v at a frequency 50Hz

1) Star 2)Delta

Calculate:

Line and phase voltages

Line and phase currents

For both configurations

Thank you for any help

Will rate and give points

Relevance
• Anonymous
7 years ago

for star connection;

E(line)= Squ.root(3) x E(phase)

where,

E=voltage

E(line)=Squ.ro ot(3) x415

E(line)=718.8v

for phase current

I(line)=I(phase)

I=V/(R+Xl) -------------(1)

inductive reactence = 2x pi x f x L = 2 x 3.141 x 50 x 254.6m = 79.96 ohm

put in eq1 then we get

I=(415)/(50+79.96) = 3.193Amp

For Delta Connection ;

E(line) = E(phase)

E(line) = E(phase)= 415V

I(line)= Squ.root(3) x I(phase)

where we have calculated I = 3.193Amp

I(line)= Squ.ro ot(3) x 3.193 = 5.53 amp

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