Electrical Power Systems

Base voltage of transmission line
121
= 11 ´ = 123.2 KV
10. 8
10. 8
Motor base voltage = 123. 2 ´ = 11 KV
121
Transformer reactance,
xT1 = xT2 = 010 .
50
60
Line reactance (positive & negative sequence)
Line reactance (zero sequence)
= 100 50
= 300 50
b g
1232 2
´
.
b g
1232 2
´
.
10. 8
11
2
´ ´ HG I KJ = 0.0805 pu
pu = 0.33 pu
= 0.99 pu
Reactance of motor 1(positive and negative sequence)
= 025
50
30
Zero-sequence reactance of motor 1
= 006
10
11
. ´ ´ HG I KJ = 0.345 pu
50
30
10
11
. ´ ´ HG I KJ
= 0.082 pu
Reactance of motor 2 (positive and negative sequence)
= 025 50
15
Zero-sequence reactance of motor 2
10
11
. ´ ´ HG I KJ = 0.69 pu
= 006 50
15
Reactance of reactors = 25 . ´
10
11
. ´ ´ HG I KJ = 0.164 pu
50
bg
11 2
2
2
2
2
= 1.033 pu
Symmetrical Components 243