Page 298 - Practical Power System and Protective Relays Commissioning

292 Practical Power System and Protective Relays Commissioning

Data:
AB 5 protected line length 5 60 km 220 kV CT 5 800/1 PT 5 220;000
100
Z 1P 5 0:0412 1 J 0:302 Ω = km 3 60
Z 10 5 0:25 1 J 0:95 Ω = km 3 60
BC 5 shortest line adjacent to the protected line AB length 5 50.5 km

Z 2P5 0:0412 1 J 0:302 Ω = km 3 50:5
BD 5 longest line adjacent to the protected line AB length 5 68 km
Z 3P 5 0:0412 1 J 0:302 Ω = km 3 68
CT ratio 5 800/1 5 800
Rated voltage 5 220 kV
Rated current 5 800 A
PT 5 220;000
100
Ratio 5 2200
Z p line AB 5 60 0:0412 1 J 0:302Þ
ð
5 2:472 1 J 18:12
5 18:287+82:231 Ω

Z P line BC 5 0:0412 1 J 0:302Þ50:5
ð
5 2:0806 1 J 15:251
5 15:356 +82:231

Z P line BD 5 0:0412 1 J 0:302Þ68
ð
5 2:8016 1 J 20:536
5 20:726+82:231
5 0:8 Z P line AB
Z 1 Reach
5 0:8 3 18:287 + 82:231
5 14:629 + 82:231 Ω

5 14:629 Ω
5 Z P line AB 1 0:5 Z P line BC
Z 2 Reach
5 ð18:287 1 0:5 3 15:356Þ+82:231
5 25:965 +82:231 Ω

5 25: 965 Ω
Z 3 Reach Z P line AB 1 1:25 Z P line BD
5 ð18:287 1 1:25 3 20:726Þ+82:231
5 44:1945 +82:231
5 44:1942 Ω