Failure
Case Studies and Correction
Overhead lines and underground
cable systems have failed in the past for different
reasons. While early examples of both types of
systems failed due to less comprehensive understanding
of the technology, both systems have solved these
problems. Failures specific to each type of system
include the following:
The principal failure mechanisms
for overhead lines include:
- Human accidents: aircraft,
vehicle and direct personal contact
- Weather-related damage:
excessive wind loading and ice loading
- Tree fall: damage to lines
from falling trees
The principal failure mechanism
for modern underground cables include:
- Human disturbance of the
ground
Underground high voltage power
cables are now not prone to damage from water
and defects in cable joints, while high voltage
overhead lines are less prone to metal fatigue
and collapse.
To learn more about cable
and line failures, choose from the topics below:
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