Power System 22

Both are correct and St2 is correct explanation of St1.

Both are correct and St2 is not correct explanation of St1. 

St1 is correct but St2 is wrong.

St2 is correct but St1 is wrong.

that particular bus is not connected to any other bus

that particular bus is not connected to reference bus

Y bus is no longer sparse matrix

no conclusion

Y bus matrix is easy to modify

Z bus matrix is used in fault study

Z bus matrix gives extra infromation compared to Y bus matrix

Y bus is preferred in load flow study

None

Z and Y bus matrix have same size for same number of buses.

If a new bus is added between reference and old bus, the size of Z bus increases

If a new bus is added between two old buses, the size of Z bus increases

If One new bus is added to reference bus (with initial n buses), the impedance parameter Z(n+1)(n+1) {the rightmost quantity in the bottom} is equal to the impedance of the new bus
 

add z in parallel to that branch

add -z in parallel to that branch

removal a branch from a Z bus matrix is not possible

None