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The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).
    Correct answer is between '73,74'. Can you explain this answer?
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    The positive, negative and zero sequence impedances of a 125 MVA, thre...
    Given that,
    Z1 = j 0.1 pu
    Z2 = j 0.05 pu
    Z0 = j 0.01 pu
    Zn = j 0.01 pu
    For LG fault, fault current is given by

    If in Amperes = (If in pu) × Ibase
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    The positive, negative and zero sequence impedances of a 125 MVA, thre...

    Calculation of Fault Current for B-phase to Ground Fault

    Given Data:
    - Positive sequence impedance (Z1) = j0.1 pu
    - Negative sequence impedance (Z2) = j0.05 pu
    - Zero sequence impedance (Z0) = j0.01 pu
    - Generator grounding impedance = j0.01 pu
    - Rated terminal voltage = 15.5 kV
    - Generator rating = 125 MVA

    Calculation Steps:
    1. Calculate the total impedance seen by the fault current for a B-phase to ground fault:
    - Zf = Z1 + Z2 + Z0 + Zg
    - Zf = j0.1 + j0.05 + j0.01 + j0.01
    - Zf = j0.17 pu

    2. Calculate the fault current using the formula:
    - If = Vph / Zf
    - If = (√3 * Vline) / Zf
    - If = (√3 * 15.5 kV) / j0.17 pu
    - If = 73.44 kA

    Therefore, the magnitude of the fault current for a B-phase to ground fault is approximately 73.44 kA.
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    Community Answer
    The positive, negative and zero sequence impedances of a 125 MVA, thre...
    Given that,
    Z1 = j 0.1 pu
    Z2 = j 0.05 pu
    Z0 = j 0.01 pu
    Zn = j 0.01 pu
    For LG fault, fault current is given by

    If in Amperes = (If in pu) × Ibase
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    The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).Correct answer is between '73,74'. Can you explain this answer?
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    The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).Correct answer is between '73,74'. Can you explain this answer? 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 positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).Correct answer is between '73,74'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).Correct answer is between '73,74'. Can you explain this answer?.
    Solutions for The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is __________ (up to 2 decimal places).Correct answer is between '73,74'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE). Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
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