Construction
Operation & Maintenance
Overhead Transmission Line
Over the years, TEPCO has coped successfully with the various challenging
issues facing overhead transmission lines. The issues include how to build
mechanically robust transmission facilities which withstand harsh inclement
conditions, such as severe thunderstorms, typhoons, heavy icy rain and snow,
and salty rains, etc. We also succeeded in minimizing the effects of corona
discharge emitted from wires as well as of thunderbolts, while we need to
ensure that we find the exact location of a flashover once a tower is hit
by a lightning. We are sometimes required to put transmission towers in a
very limited space or reconstruct in urban congested areas, or put towers
in a mountainous area, both of which we finished successfully by redesigning
the towers so as to fit the environment.
Therefore, if you face similar issues, TEPCO's consulting services are exactly
what you need. We would help you find the best solution for design, construction,
maintenance, diagnosis with aging, voltage upgrading, fault locating, accurate
distance measurement to ambient structures and other miscellaneous issues.
Improvement of the Fault-Locator
- Improvement of the Fault-Locator for Overhead Lines by correcting some
critical variables
- Only by some calculations with our consultation, the more precise locating
ability will be available.
The Revision of Variables of Fault-Locator (FL)
- Detailed adjustment for each variable,considering following conditions;
- Conductor Size, Arrangement, Length and Conductivity of the ground
- Detailed calculation for the constant of the line, using Carson-Polaczeck Method;
- Zero-phase/Positive-phase sequence impedance, etc.
The Revision of Locating Method
- To revise the locating method in case of the bus is shared among the lines.
The Result of Improvement
(in Average Error Distances)
- Ground faults;
8.41km ('92-'00 ave.)
→3.49km ('01 ave.)
- Short-circuit faults;
6.64km ('92-'00 ave.)
→1.92km ('01 ave.)
