NOnlinear finite element approach to simulate wake-induced oscillation in transmission system

Wake-induced oscillations (WIO) in transmission
line bundle conductors are simulated using finite-element
nonlinear formulation. This allows obtaining the conductor
oscillations in the line spans equipped either with spacers or
with spacer dampers. Within this approach, the interaction of
subconductors due to the wake is represented using Simpson’s
aeroelastic model. A special force element is created to
introduce the aerodynamic loads due to the wake. The
aeroelastic properties of the wake force field are tuned to meet
the wake-induced instability properties as measured by Price.
Extension of the wake interaction sample onto the full line
span is done taking into account the inertia-stiffness properties
of the line fittings (spacer dampers). It is emphasized that in
WIO the ability of spacer (spacer damper) to transfer the loads
and motions plays essential role. Thus, the transfer matrix
logic to simulate the spacer, established by Diana, Rawlins
and other researchers, is now transferred into the finite
element model of WIO. Some important structural specifics of
transmission line fittings are thus highlighted by the
performed simulations.
All these developments are introduced into the FE package
SAMCEF Mecano. Results of a series of calculations are
presented to illustrate the feasibility of the established model.
Comparison of FEM simulations to the benchmarking field
test data is presented.