RecurDyn을 이용한 송전선로의 슬릿점프 및 갤로핑 시뮬레이션

Abstract

As the power transmission line(PTL) passes through the high mountain and heavy snowfall region, icing on the PTL is expected. There is a possibility that the short circuit or ground faults may occur between the transmission line due to the icing load and the drop of icing and it greatly affects power supply. In this study, the stability of the PTL is secured through the sleet jump and galloping simulation. PTL is modeled as a mass-spring-damper system by using multi-body dynamics analysis program, RecurDyn. The lumped mass model is verified by calculated from the simulation comparing the deflection analysis according to the sag and tension. In order to analyze the dynamic behavior of PTL, a damping coefficient for a multi-body model is derived by using the free vibration test and Rayleigh damping theory. The region where the PTL passes is divided into three types, and the sleet jump simulation is performed by using the designed icing load according to the region. The maximum jump height, icing sag and amount of jump is confirmed . Also, the amount of jump and the reaction force at the supporting point according to the tension and icing load are analyzed, respectively. As a result, it is noted that the amount of jump and reaction force are influenced more by the load of ice than by the tension of PTL. The icing cross section of the single and bundle transmission line is considered by no icing, ellipse and triangle shape. The wind force coefficient for each cross section are derived by using the commercial CFD program, ANSYS Fluent. The occurrence of galloping according to the attack angle is analyzed for each shape. Galloping simulations are performed for multi-body model of the PTL by applying wind force coefficient. According to the results, dynamic behavior of the PTL is analyzed and selected the icing shape, thickness, angle attack at which galloping could occur.