Abstract
Composite cables with optical-fiber ground wire (OPGW) support both power transmission
and data communication, making more effective use of real estate and line
facilities. The inclusion of optical fibers within the cable structure, however, means that the temperature
rise limit differs from that of conventional overhead ground wires. Specifically, in power line
ground faults, virtually all of the short-circuit current flows in the ground wire, resulting in large
instantaneous rises in temperature that are a major factor in power line design. Further the OPGW
structure incorporates elements not previously used in power lines, such as pipes, spacers, etc.,
and this increases the error in calculating ordinary short-circuit temperature rise. A study was therefore
carried out to calculate short-circuit temperature rise, taking into account the structural features
specific to OPGWs, and personal computer software was developed. Comparisons with results
from short-circuit tests at a representative conductor size confirmed that calculations were accurate
to within 5%.
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