Q. Figure shows a biased percentage differential relay applied for the protection of generator windings. The relay has a 10 % slope, assuming that the CTs have a 400/5-ampere ratio and no inaccuracies (a)- if the fault has occurred near the grounded neutral end of the generator when the generator is carrying load. As a result, the currents flowing at each end are as shown in the figure. will the relay operate to trip the generator this condition, or no? show the relay operating characteristic and the points that represent the operating and restraining currents (1A=i1-i2) and (i=(i1+i2)/2) in the relay for the two conditions. (b)- Will changing the conversion ratio of current transformers to 200/5 and 400/1 change the performance of the relay? (c)- If the current 320+j0 is constant, specify what will be the maximum output current of the relay? 320+i0 304+jo Generator Coil Differential Relay%

Q. Figure shows a biased percentage differential relay applied for the protection of generator windings. The relay has a 10 % slope, assuming that the CTs have a 400/5-ampere ratio and no inaccuracies (a)- if the fault has occurred near the grounded neutral end of the generator when the generator is carrying load. As a result, the currents flowing at each end are as shown in the figure. will the relay operate to trip the generator this condition, or no? show the relay operating characteristic and the points that represent the operating and restraining currents (1A=i1-i2) and (i=(i1+i2)/2) in the relay for the two conditions. (b)- Will changing the conversion ratio of current transformers to 200/5 and 400/1 change the performance of the relay? (c)- If the current 320+j0 is constant, specify what will be the maximum output current of the relay? 320+i0 304+jo Generator Coil Differential Relay%

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 3.24P: For Problem 3.18, the motor operates at full load, at 0.8 power factor leading, and at a terminal...

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