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The positive, negative and zero sequence reactances of a wye-connected synchronous generator are 0.2 pu, 0.2 pu, and 0.1 pu, respectively. The generator is on open circuit with a terminal voltage of 1 pu. The minimum value of the inductive reactance, in  pu, required to be connected between  neutral and ground so that the fault current does not exceed 3.75 pu if a single line to ground fault occurs at the terminals is _______ (assume fault impedance to be zero). 
    Correct answer is '0.1'. Can you explain this answer?
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    Given information:
    - Positive sequence reactance (X1) = 0.2 pu
    - Negative sequence reactance (X2) = 0.2 pu
    - Zero sequence reactance (X0) = 0.1 pu
    - Terminal voltage (Vt) = 1 pu
    - Fault current limit (If) = 3.75 pu
    - Fault impedance (Zf) = 0 (assumed)

    To calculate the minimum inductive reactance required to limit the fault current to 3.75 pu, we can use the following formula:

    If = Vt / sqrt(3) * Zf / sqrt(X1^2 + (X0 + X2)^2)

    Where sqrt(3) is the factor for three-phase fault, and X0+X2 is the equivalent zero sequence reactance.

    Steps to solve:
    1. Substitute the given values in the formula and solve for Zf:

    3.75 = 1 / sqrt(3) * Zf / sqrt(0.2^2 + (0.1+0.2)^2)

    Zf = 0.1 pu

    2. The calculated value of Zf is the maximum fault impedance that can be tolerated without exceeding the fault current limit. To limit the fault current to this value, we need to connect an inductive reactance in series with the neutral.

    3. The minimum inductive reactance required can be calculated using the formula:

    Xl = sqrt(X0^2 + Zf^2) / sqrt(3) / Vt

    Substitute the values of X0 and Zf calculated above:

    Xl = sqrt(0.1^2 + 0.1^2) / sqrt(3) / 1

    Xl = 0.0577 pu ≈ 0.1 pu (rounded off to one decimal place)

    Therefore, the minimum inductive reactance required to limit the fault current to 3.75 pu is 0.1 pu.
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    The positive, negative and zero sequence reactances of a wye-connected synchronous generator are 0.2 pu, 0.2 pu, and 0.1 pu, respectively. The generator is on open circuit with a terminal voltage of 1 pu. The minimum value of the inductive reactance, in pu, required to be connected between neutral and ground so that the fault current does not exceed 3.75 pu if a single line to ground fault occurs at the terminals is _______ (assume fault impedance to be zero).Correct answer is '0.1'. Can you explain this answer?
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    The positive, negative and zero sequence reactances of a wye-connected synchronous generator are 0.2 pu, 0.2 pu, and 0.1 pu, respectively. The generator is on open circuit with a terminal voltage of 1 pu. The minimum value of the inductive reactance, in pu, required to be connected between neutral and ground so that the fault current does not exceed 3.75 pu if a single line to ground fault occurs at the terminals is _______ (assume fault impedance to be zero).Correct answer is '0.1'. 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 reactances of a wye-connected synchronous generator are 0.2 pu, 0.2 pu, and 0.1 pu, respectively. The generator is on open circuit with a terminal voltage of 1 pu. The minimum value of the inductive reactance, in pu, required to be connected between neutral and ground so that the fault current does not exceed 3.75 pu if a single line to ground fault occurs at the terminals is _______ (assume fault impedance to be zero).Correct answer is '0.1'. 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 reactances of a wye-connected synchronous generator are 0.2 pu, 0.2 pu, and 0.1 pu, respectively. The generator is on open circuit with a terminal voltage of 1 pu. The minimum value of the inductive reactance, in pu, required to be connected between neutral and ground so that the fault current does not exceed 3.75 pu if a single line to ground fault occurs at the terminals is _______ (assume fault impedance to be zero).Correct answer is '0.1'. Can you explain this answer?.
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