所屬科目：中山◆電機◆電力工程
2. Calculate the geometric mean radius of conductors shown in Fig. 2 in terms of the radius r of an individual strand. (10%)
4. The impedance matrix () of a power system is Calculate the short-circuit current for a three-phase fault occurred in bus 2 and determine the bus voltages during the fault (15%).
5. Derive the solution for the following economic dispatch problem by Lagrangian multiplier (15%)
6.Assume that the impedances for zero-sequence, positive-sequence and negative-sequence networks are Z0, Z1 and Z2 , respectively. Derive the formulas for I0, I1 , I2, and Ia and draw the interconnected sequence networks for a single line-to-ground fault as shown in Fig. 3 (20%)
阿摩線上測驗
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) and the current flowing through the
resistor. (10%)
) of a power system is
