Study On The Evaluating Method Of The Anti-Galloping Effect With Interphase Spacer Of 1000kV AC Compact Lines

Since twenty-first Century, with the rapid development of social economy in China, the demand for power supply in many densely populated areas is increasing rapidly. Therefore, the long distance and large capacity UHV compact line is a very important direction of research.As the transmission lines are exposed to air, suffering the impact of environmental conditions such as wind, rain, snow and so on, so that the transmission line might be galloping. Transmission line galloping is one of the main reason of power grid fault, will cause great harm to the line, such as flashover caused by the phase gap, or wire breaking caused by fatigue, and even the tower collapse. While distance between the wires of compact line is closer than general line, once the galloping happened, will cause more serious damage. So it is valuable to study the anti-galloping of the UHV compact transmission line.The interphase spacer is a kind of common anti-galloping device, which connects the wires in each other, so that the movement of each phase is affected, and the vibration of the line is changed. In compact lines, the interphase spacer has good anti-galloping effect and economic performance, so it is necessary to study the interphase spacer.In this paper, the numerical simulation is used for 1000kV AC compact line galloping characteristic analysis. The anti-galloping effect with interphase spacer is discussed. The effect of anti-galloping for several different interphase spacer layout schemes is evaluated.1. In this paper, the finite element model and the method of establishing the aerodynamic load model of the 1000kV UHV AC compact transmission line are discussed in detail.2. Use the span and wind speed as the main factors to consider its influence on the galloping characteristics of transmission line, and analyzed the data based on vibration order and galloping amplitude. Finally draw the conclusion that the relationship between span, wind speed and vibration order and galloping amplitude in 1000kV UHV AC compact line.3. Combined with the anti-galloping theory and characteristics of 1000kV UHV AC compact transmission line, design several anti-galloping scheme with interphase spacer, conduct the simulation experiment, modify the anti-galloping scheme with data comparison analysis. Finally the best the anti-galloping scheme with interphase spacer is obtained.