Problem based on 3-phase network :
Problem based on 3-phase network Q:Find the of the sample power power system shown in fig by using 3-phase algorithm
Slide 3:
Sequence reactance data in p.u for the sample power system are given below:
Slide 4:
Ans: positive sequence reactance diagram
n=4,e=4
B=n-1=3
Addition of branch 1between p=0 and q=1 :
Addition of branch 1between p=0 and q=1 Addition of branch 1between p=1 and q=2
Slide 6:
Addition of branch 3 between p=2 and q=3 and i=0,1,2,3 Addition of branch 4 between p=0 and q=3 and i=0,1,2,3
Elimination of Ith node,Zij(modification)=Zji(beforeelimination) –Zij Zlj/Zll :
Elimination of Ith node,Zij(modification)=Zji(beforeelimination) –Zij Zlj/Zll
Slide 8:
Zero sequence network For part I:n=2 e=1,b=n-1=1P=0&q=1
For part II: :
For part II: Addition element p=0 and q=2 & i=0 Addition element p=2 and q=3
Adding a linkp=0 to q=3 (p=ref) :
Adding a linkp=0 to q=3 (p=ref) We have