Research On The Optimal Arrangement Of Spacer Dampers For 500kV Four-Bundle Transmission Line

Spacer damper is a kind of protective fitting,which has the facility to maintain the spacing between the bundle conductors.The locations of the sapcer dampers in the span not only affect if the span can meet the electrical and physical conditions at runtime,but also concern the inhibition of the subspan oscillation.In this paper,the experiments and theory analyses were used to build a optimization model about the arrangement of spacer dampers.The model was aimed to position the spacers optimally to increase the inhibition of subspan oscillation as far as possible under some conditions.Firstly,took a quad bundle experimental span as a subject to carry out vibration experiments:non-dimension experiment and decrement experiment.Established a subspan ratio coefficient which reflected the relationship between the location of the vibration node in a span and the length of subspan next to it through non-dimension experiment.By decrement experiment,obtained that the log decrement of the conductor amplitude varied according to the subspan ratio coefficient.Further more,the fomer decreased with increasing the latter according to the experiment datas obtained by D.Hearnshaw.Secondly,set up the constraints.The constraints included the max length of the subspan determined on the basis of electrical and physical conditions to prevent sticking between adjacent subconductors;the end subspan determined on the theory of decrement and torsional stability;the middle subspans determined on the theory of decrement and detuning.the difference between the two endspans were set to avoid the symmetry of whole span.Finally,bulit a optimization model whose objection function was the minimum of the subspan ratio coefficient within certain limits.The design variable were the lengths of subspans in a span.And used the model to calculate the optimum locations of spacer dampers in some certain span,and compared the result with the traditional arrangement.The optimized subspans not only met all the operation conditions,also had the lower subspan ratio coefficients either in total average or in some specific individual value than the subspans which were arranged in traditional arrangement.