3 Questions
What percentage of overhead line faults are transient?
80-90%
What type of fault is caused by small tree branches falling on the line?
Semi-permanent
What is the main purpose of auto-recloser schemes?
To successfully re-energize the line after a fault trip
Study Notes
- Faults on overhead lines are categorized as transient, semi-permanent, or permanent
- 80-90% of overhead line faults are transient
- Transient faults are caused by lightning and temporary contact with foreign objects
- Semi-permanent faults may be caused by small tree branches falling on the line
- Permanent faults, such as broken conductors, must be located and repaired before supply can be restored
- Auto-recloser schemes permit successful re-energization of the line after a fault trip
- Sufficient time must be allowed after tripping for the fault arc to de-energize prior to reclosing
- Semi-permanent faults in forest areas are common
- Faults on underground cable sections are permanent faults
- Auto-recloser schemes have substantially improved continuity of supply.
Test your knowledge on overhead line faults and auto-recloser schemes with this informative quiz! Learn about the different categories of faults and their causes, as well as the importance of locating and repairing permanent faults. Discover how auto-recloser schemes improve supply continuity and the precautions needed for successful re-energization. Whether you're a beginner or an expert, this quiz is perfect for anyone looking to expand their understanding of overhead line faults and their solutions.
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