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RMIT University ©
School of Engineering
EEET2336 Power System Protection
Tutorial Problem Sheet 1
Problem 1
For the radial power system shown in Fig
...
1, design simple overcurrent protection using IDMT relays
with the characteristics given in Fig
...
2
...
The maximum fault
level in MVA-s on each busbar is given in Table 1
...
The available pick-up current settings for the relays
are 1 A to 12 A, in steps of 1 A
...
4 to 10, in steps of
0
...
The available ratios of current transformers to be used are given in Table 1
...
Determine the CT ratio and the settings for each relay
...
What is the condition for the above to be fulfilled automatically?
Busbar No
...
Fault MVA
2
90
60
40
Table 1
...
Ratio
1
2
3
4
150/5
200/5
300/5
400/5
5
6
500/5
7
600/5
8
700/5
9
800/5
1000/5
Table 1
...
1 Radial 11-kV distribution feeder
Page:1
RMIT University ©
School of Engineering
0
...
1
...
The relay is connected to
a CT with a CT ratio of 200: 5
...
Q4 and Table 1
...
0 Ω,
(b) 4
...
0 Ω
...
Table 1
CT ratio
50:5
100:5
150:5
200:5
250:5
300:5
400:5
450:5
500:5
600:5
Secondary
impedance [Ω}
0
...
082
0
...
125
0
...
168
0
...
230
0
...
296
Secondary magnetizing
voltage [V]
Secondary magnetizing current [A]
Page:3