Transcription of ELECTRICAL POWER SYSTEM FAULT ANALYSIS
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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.
Zbus IMPEDANCE MATRIX ... between them, a fact that is making this method of analysis quite simple. 1.21 General principles Any set of unbalanced 3-phase voltages (or current) can be transformed into 3 balanced sets. These are: 1. A positive sequence set of three symmetrical voltages (i.e. all numerically equal
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