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Questions and Answers
What percentage of overhead line faults are transient?
What percentage of overhead line faults are transient?
- 10-20%
- 30-40%
- 50-60%
- 80-90% (correct)
What type of fault is caused by small tree branches falling on the line?
What type of fault is caused by small tree branches falling on the line?
- Transient
- Semi-permanent (correct)
- Permanent
- None of the above
What is the main purpose of auto-recloser schemes?
What is the main purpose of auto-recloser schemes?
- To locate and repair permanent faults
- To prevent transient faults
- To successfully re-energize the line after a fault trip (correct)
- To de-energize the fault arc
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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.
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