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ELECTRICAL POWER SYSTEM FAULT ANALYSIS

1 Contents CHAPTER ONE ..4 FAULT ..4 CAUSES OF POWER SYSTEM FAULTS ..4 COMMON POWER SYSTEM FAULTS ..4 EFFECTS OF POWER SYSTEM FAULTS ..5 THEVENIN S EQUIVALENT CIRCUIT ..5 SYMMETRICAL COMPONENTS ..6 General principles ..6 THREE-SEQUENCE IMPEDANCES AND SEQUENCE NETWORKS ..9 PHYSICAL SIGNIFICANCE OF SEQUENCE COMPONENTS .. 10 CHAPTER TWO .. 11 SEQUENCE NETWORKS OF SYNCHRONOUS MACHINES .. 11 Positive sequence network .. 12 Negative sequence network .. 13 Zero sequence network .. 15 SEQUENCE IMPEDANCES OF TRANSMISSION LINE .. 17 SEQUENCE IMPEDANCES OF TRANSFORMERS .. 17 FORMATION OF SEQUENCE NETWORKS .. 18 UNSYMMETRICAL FAULTS.

since this yields three (fictitious) single phase networks, only one of which contains a driving emf. Since the system reactances are balanced the thee fictitious networks have no mutual coupling between them, a fact that is making this method of analysis quite simple. 1.21 General principles

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