Part-1
Given system
Positive sequence network of the given system
Thevenin’s equivalent Positive sequence impedance at Bus-E
Negative sequence network:
Negative sequence impedance at bus-E
Zero sequence network
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PART-II
Three phase fault at bus-E
Pre fault voltage at bus-E is 1.03v
From symmetrical component analysis
{A}Where
By substituting all values in {A}
MATLAB CODE
| %Part2ang=@(a) cos(a*(pi/180))+(sin(a*(pi/180))*1j);Ea=1.03;z1=0.1245j;If1=Ea/z1;Iaf=If1;Ibf=ang(240)*If1;Icf=ang(120)*If1;display(‘pahse-A fault current’);disp(abs(Iaf));disp(angle(Iaf)*180/pi);display(‘pahse-B fault current’);disp(abs(Ibf));disp(angle(Ibf)*180/pi);display(‘pahse-c fault current’);disp(abs(Icf));disp(angle(Icf)*180/pi); |
Part-3:
Single line to groung fault at bus-e
Where
Substitute all values in the above equation
MATLAB CODE
