9. Four identical alternators each rated for 20 MVA, 11 KV have a subtransient reactance of 164 are working in parallel. The short circuit level at the bus bar is a. 500 MVA b. 125 MVA c. 400 MVA d. 80 MVA A generator having a solidly grounded neutral and arte 10. 50-MVA, 30 kV has positive, negative and zero sequence reactances of 25, 15 and 5 percent respectively. What reactance must be placed in the generator neutral to limit the fault current for a line to ground fault to that for a three phase fault? a. 1.330 b. 1.80 c. 0.80 d. 0.12

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Nodal Analysis

In the analysis of any electric circuit, nodal analysis is the method of determining the potential difference or voltage between different nodes in an electric circuit. A node is a point where two or more branches connect each other. In the nodal analysis, the voltages are determined in the terms of branch currents. The nodal analysis is also known as the node voltage method or branch current method. The nodal analysis method is one of the several applications of Kirchhoff's Current Law (KCL).