Design of Interphase Composite Spacer for 500kV Compact Transmission Line
(2005)Abstract
All of wind load, ice shedding, electrodynamic
force of short-circuit current will cause asynchronous
vibration of different phase conductors and reduction of
interphase clearance. The interphase clearance of
compact transmission lines is much shorter than regular
lines, so the compact lines have more severe problems
than regular lines in adverse conditions. To synchronize
the vibration of different phase conductors and avoid the
breakdown of interphase clearance, interphase spacer
should be installed, which is the key technology for the
compact line. To design the parameters of the interphase
spacer for the 500kV compact transmission line, such as
structural length and core rod diameter, mechanical
characteristic of spacer must be analyzed and studied. In
this paper, a computational model of spacer is introduced
to calculate the exact stressed state of the spacer at
different compressions and different placement.
Furthermore, to determine the location where the spacers
are installed in the span, a system model of overhead line
is presented. For simulation, firstly add the spacer model
to line system according to design solution, then excite
the system by some kind of excication, and obtain the
reponse of the line, finally estimate the design solution.
• At last a complete design solution of the interphase
spacer for the 500kV compact line is presented.
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