5). For the secondary fault injection shown below into a Delta-Wye substation po

Question

5). For the secondary fault injection shown below into a Delta-Wye substation power transformer 487E differential relay. Indicate if the fault is: A) Internal Fault B) External Fault Channel Va Vi Magnitude (RMS) Phase Angle lest Report 69.28 V 69.28 V 69.28 V 4.600 A 4.600 A 4.600 A 4.010 A 4.010 A 4.010 A 0.00 240.00 Menu 120.00%. Ve- va 0.00° 240.00 120.00° 30.00 270.00 150.00 la- I Onion Set up Display On Fault Type Conf Ampliliers Arbitrary 6N 0e 0.0000 sec Frequency 160.000 Hz V4(DC) 125.00 Vdc Fault Timer Ic2 la2 Advanced Settings 180 Rotate 0 aul Tone State Inputs12345678 9 1011 12 Outputs Dm On 270 Generating on

Explanation / Answer

This may be the internal fault bacause frequency is at rated and all three phase are conducting , so there may be a problem in the hardware .This Should be removed .

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