A single-phase transformer is rated at 110/33 kV,50 MVA. It is to be protected by a differential relay with input taps of 3.0, 4.0, 4.8, 5.0, 5.2, and 6.0 A secondary. The available current ratios are shown in Figure Q2(c). Calculate the CT ratio mismatch. Current Ratios 50:5 100:5 150:5 200:5 250:5 300:5 400:5 600 :5 2000:5 450:5 500:5 800:5 900:5 1000:5 1200:5 1500:5 1600:5 2400:5 2500:5 3000:5 3200:5 4000:5 5000:5 6000 :5

Introductory Circuit Analysis (13th Edition)
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A single-phase transformer is rated at 110/33 kV, 50 MVA. It is to be protected by a differential
relay with input taps of 3.0, 4.0, 4.8, 5.0, 5.2, and 6.0 A secondary. The available current ratios
are shown in Figure Q2(c). Calculate the CT ratio mismatch.
Current Ratios
50:5
100:5
150:5
200:5
250:5
300:5
400:5
450:5
500:5
600:5
800:5
900:5
1000:5
1200:5
1500:5
1600:5
2000:5
2400:5
2500:5
3000:5
3200:5
4000:5
5000:5
6000:5
Figure Q2(c)
Transcribed Image Text:A single-phase transformer is rated at 110/33 kV, 50 MVA. It is to be protected by a differential relay with input taps of 3.0, 4.0, 4.8, 5.0, 5.2, and 6.0 A secondary. The available current ratios are shown in Figure Q2(c). Calculate the CT ratio mismatch. Current Ratios 50:5 100:5 150:5 200:5 250:5 300:5 400:5 450:5 500:5 600:5 800:5 900:5 1000:5 1200:5 1500:5 1600:5 2000:5 2400:5 2500:5 3000:5 3200:5 4000:5 5000:5 6000:5 Figure Q2(c)
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