An over current relay set to operate at secondary current 100 A is connected to the multi ratio C.T characteristics is given in fig, with 500/5 C.T ratio, the core area A=0.001935 m (the core is built in silicon steel and frequency 60 Hz). If the burden ZB is : (a) 0.32 30 (b) 12. 1- Determine whether or not the C.T will saturate.

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30
An over current relay set to operate at secondary current 100 A is
connected to the multi ratio C.T characteristics is given in fig, with
500/5 C.T ratio, the core area A=0.001935 m (the core is built in
silicon steel and frequency 60 Hz).
If the burden Zg is : (a) 0.3N
(Φ) 1Ω.
1- Determine whether or not the C.T will saturate.
2- Determine the C.T error.
3- Will the relay detect a 11kA primary fault current?
500
(see notes)
CT
ratio resistance 2
Secondary
100
50.5
100:5
150:5
200:5
250:5
300:5
400:5
450:5
500:5
600:5
0.061
0.082
0.104
0.125
0.146
0.168
0.211
0.230
0.242
0.296
600 : 5-
500 : 5-
450 : 5-
400 : 5-
- 50 : 5
100 : 5
300 : 5-
150 5
-200 5
250 : 5
01
0.001
0.01
0.1
1
10
100
Sec exc ting amps. I.
Sec exciting volts, V.
1.
Transcribed Image Text:1 30 An over current relay set to operate at secondary current 100 A is connected to the multi ratio C.T characteristics is given in fig, with 500/5 C.T ratio, the core area A=0.001935 m (the core is built in silicon steel and frequency 60 Hz). If the burden Zg is : (a) 0.3N (Φ) 1Ω. 1- Determine whether or not the C.T will saturate. 2- Determine the C.T error. 3- Will the relay detect a 11kA primary fault current? 500 (see notes) CT ratio resistance 2 Secondary 100 50.5 100:5 150:5 200:5 250:5 300:5 400:5 450:5 500:5 600:5 0.061 0.082 0.104 0.125 0.146 0.168 0.211 0.230 0.242 0.296 600 : 5- 500 : 5- 450 : 5- 400 : 5- - 50 : 5 100 : 5 300 : 5- 150 5 -200 5 250 : 5 01 0.001 0.01 0.1 1 10 100 Sec exc ting amps. I. Sec exciting volts, V. 1.
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