Power System lab viva

What does the Y-bus matrix represent in power system analysis?

Which of the following statements is true about the Y-bus matrix? It is not always symmetric. It represents the total impedance of the power system. It is computed using Kirchhoff's voltage law (KVL) at each node. It contains both real and imaginary elements

How is the Y-bus matrix affected when a new branch is added to the power system?

Which method is commonly used for Y-bus formation in power system analysis? Options: Admittance matrix method, Impedance matrix method, Nodal analysis method, Mesh analysis method

What is the size of the Y-bus matrix for an N-bus power system?

the positive, negative and zero sequence reactance of an element of power system are 0.3, 0.3 and 0.8 respectively. Then the element would be

The zero sequence fault currents are absent when the fault is: single line to ground, line to line, double line to ground, None

When a line-to-ground fault occurs the current in a faulted phase is 100 A. The zero sequence current in this case will be

the value of the expression a + a^2 is

A balanced 3-phase system consists of