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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.

1.04 EFFECTS OF POWER SYSTEM FAULTS Faults may lead to fire breakout that consequently results into loss of property, loss of life and destruction of a power system network. Faults also leads to cut of supply in areas beyond the fault point in a transmission and distribution network leading to power blackouts; this

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