2/2/13 12:58 PM C:\Users\Wulle\Desktop\Kodovi u Matlabu\New folder\TipE.m 1 of 2

Iu=4.6 %[kA]

%Koordinate èvorova i preènik grana uzemljivaèa (XP,YP,ZP,XQ,YQ,ZQ,D)U=[0 0 0.8 5 0 0.8 0.1 5 0 0.8 10 0 0.8 0.1 10 0 0.8 10 5 0.8 0.1 10 5 0.8 10 10 0.8 0.1 10 10 0.8 5 10 0.8 0.1 5 10 0.8 0 10 0.8 0.1 0 10 0.8 0 5 0.8 0.1 0 5 0.8 0 0 0.8 0.1 0 0 0.8 5 5 1.8 0.1 5 5 1.8 10 10 0.8 0.1 0 10 0.8 5 5 1.8 0.1 5 5 1.8 10 0 0.8 0.1 0 5 0.8 5 5 1.8 0.1 5 5 1.8 10 5 0.8 0.1 5 0 0.8 5 5 1.8 0.1 5 5 1.8 5 10 0.8 0.1]; %input matrica geometrije uzemljivaèa [m]

N=size(U,1); %broj grana uzemljivaèaro=90; %specifièna otpornost zemljišta [ohm*m]

for i=1:N; L(i)=sqrt((U(i,1)-U(i,4))^2+(U(i,2)-U(i,5))^2+(U(i,3)-U(i,6))^2);endL %dužine grana uzemljivaèa

for m=1:N;for n=1:N;

if (m==n); r(m,n)=ro/(2*pi*L(m))*log(2*L(m)/U(m,7));

else Sx=(U(i,1)+U(i,4))/2; Sy=(U(i,2)+U(i,5))/2; Sz=(U(i,3)+U(i,6))/2; d1=sqrt((Sx-U(i,1))^2+(Sy-U(i,2))^2+(Sz-U(i,3))^2); d2=sqrt((Sx-U(i,3))^2+(Sy-U(i,4))^2+(Sz-U(i,5))^2);

if ((d1+d2-L(m)<10^(-10))&(d1+d2-L(m)>(-10^(-10)))) r(m,n)=ro/(4*pi*L(m));

else r(m,n)=(ro/(4*pi*L(m)))*log((d1+d2+L(m))/(d1+d2-L(m)));

endend

endend

r

I=ones(N,1);It=ones(1,N);Ru=1/(It*inv(r)*I) %otpornost rasprostiranja uzemljivaèaUu=Ru*Iu %potencijal uzemljivaèa

2/2/13 12:58 PM C:\Users\Wulle\Desktop\Kodovi u Matlabu\New folder\TipE.m 2 of 2

[I]=inv(r)*I*Uu % Struja koja se odvodi u zemlju sa dijelova uzemljivaèa

A=1.28 %udaljenost taèke A od uzemljivaèaXA=5;YA=-1;ZA=0.8; %koordinate taèke AVA=0;

for p=1:N r1= sqrt((U(p,1)-XA)^2+(U(p,2)-YA)^2+(U(p,3)-ZA)^2); r2= sqrt((U(p,4)-XA)^2+(U(p,5)-YA)^2+(U(p,6)-ZA)^2); alfa=((ro/(4*pi*L(p)))*log((r1+r2+L(p))/(r1+r2-L(p))))*I(p); VA=VA+alfa;

end

VA %potencijal taèke A [kV]

D=0.16; %površina stopala [m^2]Rc=1000; %otpornost ljudskog tijela [ohm]Rs=ro/(2*D); %prelazni otpor [ohm]E=Uu-VAUd=(E*Rc)/(Rc+Rs/2) %napon dodira [kV]Uk=(E*Rc)/(Rc+2*Rs) %napon koraka [kV]