Question

Y bus is used in the power flow studies and z bus is used for short circuit studies both are same?

Answer 1

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Answer 2

Y bus is used in the power flow studies and z bus is used for short circuit studies both are not same.

• Zbus quantities characterize conditions when all current injections are zero except one, corresponding to the faulted bus.
• The Y bus matrix is used to study for the load flow studies.
• Z bus algorithm or matrix is used to study for the fault analysis.
• Inverse of Y bus matrix gives the Z bus matrix, But Z matrix is a full matrix even though Y bus is a sparse matrix.
• Of the various network matrices , the bus admittance matrix (YBUS ) and the bus impedance matrix (ZBUS ) are determined for a given power system by the rule of inspection.
• Y-bus is a sparse matrix hence computer memory requirements are less.
• It is very useful in load flow and stability analysis in Y bus
• Its formation and modification are easy in Y bus
• Data preparation is simple in Y bus.

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