Conference,
APPLICATION OF ADVANCED METHODS TO TRANSMISSION LINE INSULATION DESIGN
(1981)
Abstract
Considering recent progress in insulation
research and in statistical computation
of line performance, it appeared desirable
to reevaluate the transmission
system insulation requirements. A
comprehensive series of phase-to-ground and
phase-to-phase insulation tests was undertaken.
The test results overlap and extend
existing data, making available design
curves for flashover strength in the
145-765 kV range. In addition,the magnitude
of the swing angle of free - swinging insulator
strings as a function of the wind
velocity has been studied. The results of
this study provide a better accuracy of the
swing angle statistics for a reliable
assessment of this important performance
parameter. A statistical design procedure
was applied to convert the electrical performance
criteria to insulation clearances.
The relativ importance of design factors
and insulation duties is discussed. ~he
analysis also indicates possible reductions
in tower dimensions without significantly
impairing line reliability.
