Research On Galloping Character And Anti-Galloping Measure For Compact Transmission Line

Compact structure,less area,low cost,large transmission power and strong unit power supply capacities are characteristics of the compact transmission lines,so it is widely used,but due to bad weather,galloping has become a major failure.Galloping is a low frequency,large amplitude self-excited vibration of non-uniform ice transmission line,which is under the action of wind.Galloping endangers the safe operation of the transmission line greatly,ranging from wire whipping,burning,broken stock and etc.,even will cause line disconnection,tower broken,line tripped,severe blackouts,and bring significant economic losses to society.In order to enhance the ability of anti-galloping in compact transmission line furtherly,this article has carried on the following experiment and simulation research on galloping characteristic and anti-galloping technique with Jianshan experimental line.1.By installing mock ice for compact transmission line,incenting it,and letting it gallop under the natural wind excitation,the paper observed and analyzed the galloping characteristics and anti-galloping of installed inter-phase spacers.Firstly,the galloping wind velocity,galloping amplitude and frequency,galloping shape in galloping characteristics of compact line were analyzed.Then the change of galloping wind speed,amplitude and frequency were compared and analyzed before and after the installation of inter-phase spacers,it was found that most of the inter-phase spacers were damaged in degrees,indicating that the anti-galloping ability of inter-phase spacer needs to be improved.2.Not only was the finite element model(FEM)of the Jianshan Overhead Compact Test Line established based on actual parameters,but the modal analysis and galloping character were analyzed.Firstly the FEM's modal analysis is compared with theoretical modal calculation results,obtaining the low order natural frequency and mode shape of the test line.Then the simulation results were analyzed and compared with the results of galloping experiment condition in the galloping wind speed,amplitude and frequency and galloping shape to verify the correctness of the nonlinear finite element simulation method.Furthermore,the galloping amplitude and frequency,galloping shape and the conductor tension of several conditions outside experiment condition were analyzed,and the galloping characteristics were given.3.Based on the method of joint anti-galloping combined inter-phase spacer with phase-to-earth spacer proposed by the working group of Henan Electric Power Research Institute,the anti-galloping FEM models under different working conditions by phase-to-earth spacers and phase-to-earth spacers combined inter-phase spacers were simulated to explore effective measures.Not only the influence of inter-phase spacer and phase-to-earth spacers combined inter-phase spacers on the modal frequency was explored,but also the galloping amplitude and frequency,galloping from,galloping tension,phase spacing and wire stress of inter-phase spacer and phase-to-earth spacers combined inter-phase spacers were explored to proof the effectiveness of the anti-galloping devices.