4 Disturbance of Normal Operating Conditions and Other Problems

4.1  INTRODUCTION

The normal operation of a power system may be disturbed or disrupted owing to a system fault when abnormally high currents flow through an abnormal path as a result of the partial or complete failure of the insulation at one or more points of the system. The complete failure of insulation is called a “short circuit” or “fault.”

A short circuit occurs on a power system when one or more energized conductors contact other conductors or ground. In the event of insulation failure, it may not be essential for the conductors to be in actual contact. The short circuit ...

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