Q1. The following figure shows the power transformer differential protection with AY connection with specifications of 20 MVA,66/11 KV. if a single-phase short circuit occurs on phase a once at location F1 and again at location F2, current 9000A will flow. Desirable: The currents passing through the relays R, Y, B? TMS If these relays are three overcurrent relays with inverse characteristics as t= And if their adjustment Iset Log10(7 values are Iset= 0.5 A and TMS= 0.21, will the relays work for such a short circuit? If yes, which relay works faster and when? 200/1 66KV 11KV 2000/1 20MVA F2 F1 %23 a b C

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Publisher:Robert L. Boylestad
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Q1. The following figure shows the power transformer differential protection with AY connection with
specifications of 20 MVA,66/11 KV. if a single-phase short circuit occurs on phase a once at location F1 and
again at location F2, current 9000A will flow.
Desirable:
The currents passing through the relays R, Y, B?
TMS
If these relays are three overcurrent relays with inverse characteristics as t=
And if their adjustment
Log10(1set
values are Iset= 0.5 A and TMS= 0.21, will the relays work for such a short circuit? If yes, which relay works
faster and when?
200/1
11KV
2000/1
66KV
20MVA
F2
F1
a
b
Transcribed Image Text:Q1. The following figure shows the power transformer differential protection with AY connection with specifications of 20 MVA,66/11 KV. if a single-phase short circuit occurs on phase a once at location F1 and again at location F2, current 9000A will flow. Desirable: The currents passing through the relays R, Y, B? TMS If these relays are three overcurrent relays with inverse characteristics as t= And if their adjustment Log10(1set values are Iset= 0.5 A and TMS= 0.21, will the relays work for such a short circuit? If yes, which relay works faster and when? 200/1 11KV 2000/1 66KV 20MVA F2 F1 a b
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