The Magnitude of Initial Symmetrical RMS Current in Breakers during a Three-Phase Short Circuit Fault

What is the magnitude of initial symmetrical rms current in the breakers when a three-phase short circuit fault occurs?

The magnitude of initial symmetrical rms current in the breakers during a three-phase short circuit fault can be calculated using the sub-transient reactance, transient reactance, and synchronous reactance of the generator.

Calculation of Initial Symmetrical RMS Current

The magnitude of initial symmetrical rms current in the breakers during a three-phase short circuit fault can be determined using the reactance values provided for the generator. The sub-transient reactance (X"), transient reactance (X'), and synchronous reactance are crucial parameters in calculating the current. Impedance Calculation: To determine the total impedance (Z) during the fault, we can use the formula: Z = X" + X' Substitute Given Values: Substituting the given values: X" = 0.19 X' = 0.26 Calculate Total Impedance: Z = 0.19 + 0.26 Z = 0.45 Current Calculation: Using the formula I = V / Z, where: I = current V = rated voltage of the generator (11 kV) Substitute Values and Solve: I = 11,000 / 0.45 I = 24,444 A Therefore, the magnitude of the initial symmetrical rms current in the breakers during a three-phase short circuit fault is 24,444 amperes.
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