A novel methodology for on-line identification of arcing high impedance faults on overhead power distribution feeders

Abstract

A novel methodology for online identification of arcing high impedance fault on overhead power distribution feeders Abstract Electrical utilities use overhead energized conductors to transport electrical energy to consumers. There are millions of kilometres of overhead distribution lines in the world supplying energy for industrial, commercial and residential customers. In low and medium voltage overhead distribution systems, overhead conductors are exposed to the surrounding elements and to abnormal conditions. High impedance faults (HIFs) on distribution feeders are abnormal electrical conditions that cannot be detected by conventional protection schemes and their detection is considered to be generally a difficult problem. Such faults usually occur when a distribution line conductor is contacted by a high resistance grounded object, such as a tree, or when" a conductor breaks and falls on a poorly conducting earth surface. The main problem is that HIFs do not draw sufficient fault current to be easily identified, and the presently available protection systems and relays are incapable of accurately distinguishing high impedance faults, such as a downed power line conductor, from other normal system events and activities. These faults pose a threat to human lives and properties when neighbouring objects come into contact with the lines and energized conductors.

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