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. The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA?
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. The 33 kV bus-bars of a station are in two sections P and Q separate...
Calculation of Reactance of the Reactor
- Given data:
- Section P: 4 x 10 MVA generators with 20% reactance each
- Section Q: 50 MVA transformer with 10% reactance
- Rupturing capacity of circuit breakers: 500 MVA
- Symmetrical short-circuit on an outgoing feeder connected to A
- Base MVA: 50 MVA
- Calculations:
1. Total MVA in section P = 4 x 10 = 40 MVA
2. Total reactance in section P = 4 x 20% = 80%
3. Total MVA in section Q = 50 MVA
4. Total reactance in section Q = 10%
5. Total MVA at the bus-bar = 40 + 50 = 90 MVA
6. Total reactance at the bus-bar = 80% + 10% = 90%
7. Short-circuit MVA = Base MVA = 50 MVA
8. Short-circuit current = Short-circuit MVA / Total reactance at the bus-bar = 50 / 0.9 = 55.56 kA
9. Maximum allowable short-circuit current = Rupturing capacity of circuit breakers = 500 MVA / 33 kV = 15.15 kA
10. Reactance of the reactor to limit short-circuit current to 15.15 kA = Short-circuit MVA / Maximum allowable short-circuit current = 50 / 15.15 = 3.3%
- Therefore, to prevent the circuit breakers from being overloaded in case of a symmetrical short-circuit, the reactor should have a reactance of approximately 3.3%.
- Given data:
- Section P: 4 x 10 MVA generators with 20% reactance each
- Section Q: 50 MVA transformer with 10% reactance
- Rupturing capacity of circuit breakers: 500 MVA
- Symmetrical short-circuit on an outgoing feeder connected to A
- Base MVA: 50 MVA
- Calculations:
1. Total MVA in section P = 4 x 10 = 40 MVA
2. Total reactance in section P = 4 x 20% = 80%
3. Total MVA in section Q = 50 MVA
4. Total reactance in section Q = 10%
5. Total MVA at the bus-bar = 40 + 50 = 90 MVA
6. Total reactance at the bus-bar = 80% + 10% = 90%
7. Short-circuit MVA = Base MVA = 50 MVA
8. Short-circuit current = Short-circuit MVA / Total reactance at the bus-bar = 50 / 0.9 = 55.56 kA
9. Maximum allowable short-circuit current = Rupturing capacity of circuit breakers = 500 MVA / 33 kV = 15.15 kA
10. Reactance of the reactor to limit short-circuit current to 15.15 kA = Short-circuit MVA / Maximum allowable short-circuit current = 50 / 15.15 = 3.3%
- Therefore, to prevent the circuit breakers from being overloaded in case of a symmetrical short-circuit, the reactor should have a reactance of approximately 3.3%.
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. The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA?
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. The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about . The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for . The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA?.
. The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about . The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for . The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA?.
Solutions for . The 33 kV bus-bars of a station are in two sections P and Q separated by a reactor. The section P is fed from four 10 MVA generators each having a reactance of 20%. The section Q is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have a rupturing capacity of 500 MVA. Find the reactance of the reactor to prevent the circuit breakers from being overloaded if a symmetrical short-circuit occurs on an outgoing feeder connected to A. Take base MVA as 50 MVA? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
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