Abstract
A tower consisting of two guyed masts supporting a flexible crossarm formed of steel cables is planned for
use on future 735 kV lines on the Hydro-Quebec network. The application of this concept called "chafnette
tower" at this high tension level and under the loading conditions to be met, called for a detailed study in order
to establish the layout of the structure, followed by a thorough validation program.
This Paper first describes the design of the chafnette tower and then the validation program. The program
was intended to examine the mechanical behaviour of the system, explore and develop appropriate construction
and maintenance techniques and to evaluate the economic gain that would be realized. Computer analyses,
experiments on reduced scale models as well as the construction and full scale testing of a section of line were
used to meet these objectives.
The validation program leads to the conclusion that the chainette tower is technically sound, advantageous
for construction and maintenance, and also more economical than conventional towers.
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