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Questions and Answers
What percentage of overhead line faults are transient?
What percentage of overhead line faults are transient?
- 50-60%
- 70-80%
- 80-90% (correct)
- 90-100%
What percentage of overhead line faults are categorized as transient?
What percentage of overhead line faults are categorized as transient?
- 10-20%
- 30-40%
- 50-60%
- 80-90% (correct)
What type of faults are caused by small tree branches falling on the line?
What type of faults are caused by small tree branches falling on the line?
- Transient faults
- Semi-permanent faults (correct)
- Permanent faults
- None of the above
What causes semi-permanent faults on overhead lines?
What causes semi-permanent faults on overhead lines?
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What type of faults require locating and repairing before supply can be restored?
What type of faults require locating and repairing before supply can be restored?
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Which type of fault on overhead lines requires locating and repairing before supply can be restored?
Which type of fault on overhead lines requires locating and repairing before supply can be restored?
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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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