A single-phase transformer bank has a rating of 30 MVA, 132kV/33 kV. By referring to the standard current transformer (CT) ratio in Table Q2, design a differential protection scheme for the protection of the transformer against internal fault. In the event of an internal fault in the transformer, 250 A of current flows through the high voltage (HV) side, while 750 A flows through the low voltage (LV) side. By evaluating this phenomena, justify whether the differential relay may or may not cause the circuit breaker to trip. (State any assumptions made) 50:5 450:5 1500:5 4000:5 100:5 500:5 1600:5 5000:5 150:5 600:5 2000:5 6000:5 Table Q2 CT Ratios 200:5 800:5 2400:5 250:5 900:5 2500:5 300:5 1000:5 3000:5 400:5 1200:5 3200:5
A single-phase transformer bank has a rating of 30 MVA, 132kV/33 kV. By referring to the standard current transformer (CT) ratio in Table Q2, design a differential protection scheme for the protection of the transformer against internal fault. In the event of an internal fault in the transformer, 250 A of current flows through the high voltage (HV) side, while 750 A flows through the low voltage (LV) side. By evaluating this phenomena, justify whether the differential relay may or may not cause the circuit breaker to trip. (State any assumptions made) 50:5 450:5 1500:5 4000:5 100:5 500:5 1600:5 5000:5 150:5 600:5 2000:5 6000:5 Table Q2 CT Ratios 200:5 800:5 2400:5 250:5 900:5 2500:5 300:5 1000:5 3000:5 400:5 1200:5 3200:5
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.27P: A three-phase transformer is rated 1000MVA,220Y/22kV. The Y-equivalent short-circuit impedance,...
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