## Dynamics of a Synchronous Machine

Dynamics of a Synchronous Machine: Dynamics of a Synchronous Machine – kinetic energy of the rotor at synchronous machine is where But where where We shall define the inertia constant H such that where It immediately follows that M is also called the inertia constant. Taking G as base, the inertia constant in pu is […]

## Introduction to Power System Stability

Introduction to Power System Stability: Introduction to Power System Stability – The stability of an interconnected power system is its ability to return to normal or stable operation after having been subjected to some form of disturbance. Conversely, instability means a condition denoting loss of synchronism or falling out of step. Stability considerations have been […]

## Bus Impedance Matrix Method

Bus Impedance Matrix Method for Analysis of Unsymmetrical Shunt Faults: Bus Impedance Matrix Method of fault analysis, given for symmetrical faults  can be easily extended to the case of unsymmetrical faults. Consider for example an LG fault on the rth bus of a n-bus system. The connection of sequence networks to simulate the fault is […]

## Open Conductor Faults

Open Conductor Faults: An open conductor faults is in series with the line. Line currents and series voltages between broken ends of the conductors are required to be determined. Figure 11.19 shows currents and voltages in an open conductor fault. The ends of the system on the sides of the fault are identified as F, […]

## Double Line to Ground Fault

Double Line to Ground Fault (LLG): Figure 11.9 shows a Double Line to Ground Fault at F in a power system. The fault may in general have an impedance Zf as shown. The current and voltage (to ground) conditions at the fault are expressed as The symmetrical components of voltages are given by from which […]

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