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Symmetrical Fault Analysis

ZBUS Formulation

ZBUS Formulation: ZBUS Formulation is given by By Inventing YBUS The sparsity of YBUS may be retained by using an efficient inversion technique and nodal impedance matrix can then be calculated directly from the factorized admittance matrix. Current Injection Method: Equation (9.33) can be written in the expanded form It immediately follows from Eq. (9.34) …

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Selection of Circuit Breaker

Selection of Circuit Breaker: There are two types of Selection of Circuit Breaker ratings which require the computation of SC current are: (i) rated momentary current and (ii) rated symmetrical interrupting current. Symmetrical SC current is obtained by using subtransient reactances for synchronous machines. Momentary current (rms) is then calculated by multiplying the symmetrical momentary …

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Short Circuit Current Computation through Thevenin Theorem

Short Circuit Current Computation through Thevenin Theorem: An alternate method of computing Short Circuit Current Computation is through the application of the Thevenin theorem. This Short Circuit Current Computation method is faster and easily adopted to systematic computation for large networks. While the method is perfectly general, it is illustrated here through a simple example. …

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Transient on a Transmission Line

Transient on a Transmission Line: Let us consider the short circuit Transient on a Transmission Line. Certain simplifying assumptions are made at this stage. The line is fed from a constant voltage source (the case when the line is fed from a realistic synchronous machine. Short circuit takes place when the line is unloaded. Line …

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Introduction to Symmetrical Fault in Power System

Introduction to Symmetrical Fault in Power System: Introduction to Symmetrical Fault in Power System devoted to abnormal system behaviour under conditions of symmetrical short circuit (symmetrical three-phase fault). Such conditions are caused in the system accidentally through insulation failure of equipment or flashover of lines initiated by a lightning stroke or through accidental faulty operation. …

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