Collapse Analysis of a Transmission Tower-Line System Induced by Ice Shedding

Abstract

Ice shedding causes transmission lines to vibrate violently, which induces a sharp increase in the longitudinal unbalanced tension of the lines, even resulting in the progressive collapse of transmission towers in serious cases, which is a common ice-based disaster for transmission tower-line systems. Based on the actual engineering characteristics of a 500 kV transmission line taken as the research object, a finite element model of a two-tower, three-line system is established by commercial ANSYS finite element software. In the modeling process, the uniform mode method is used to introduce the initial defects, and the collapse caused by ice shedding and its influencing parameters are systematically studied. The results show that the higher the ice-shedding height is, the greater the threat of ice shedding to the system; furthermore, the greater the span is, the shorter the insulator length and the greater the dynamic response of the line; the impact of ice shedding should be considered in the design of transmission towers.

Differential triboelectric nanogenerator for transmission line vibration suppression and energy harvesting in the grid

“…The real-time inspection of the transmission line is an urgent demand for the smart grid to keep the uninterrupted electricity power delivery [12]. The inspection includes not only the line, but the towers [13]. Manpower inspection cannot meet the real time requirements, therefore, the sensorbased inspection becomes a favourable solution [14].…”

Application Research of Optical Fiber Sensing Technology in Power Optical Fiber Communication Systems

“…The tripping or shutdown of the transmission overhead lines, caused by factors such as ice, dancing, and lightning strikes, frequently occur. It affects the safe and stable operation of the power system [1][2][3][4]. Therefore, it is very important to monitor the safety and health of power transmission cables online to detect faults and issue early warnings in time.…”

“…The tripping or shutdown of the transmission overhead lines, caused by factors such as ice, dancing, and lightning strikes, frequently occur. It affects the safe and stable operation of the power system [1][2][3][4]. Therefore, it is very important to monitor the safety and health of power transmission cables online to detect faults and issue early warnings in time.Compared with electronic sensors, optical fiber sensing technology has advantages, such as strong anti-electromagnetic interference ability, corrosion resistance, insulation, easy remote measurement, easy networking, good confidentiality, lightweight, and miniaturization [5], which makes optical fiber sensing technology expected to be widely applied in the field of power transmission where the use of traditional electronic sensors is limited [6].This paper summarizes the current research and application status of optical fiber sensing online monitoring technology for transmission lines.…”

Design of rapid erection system for transmission lines for disaster rescue

“…The rapid erection system of disaster relief cables can restore the power supply in the disaster area within a very short time. The power system is the lifeline in the disaster relief process of earthquakes, typhoons, snow, and ice disasters; thus, the research and development of the rapid erection system of disaster relief cable are very important [1] . On August 4, 2013, under the influence of heavy rain and a hurricane as high as grade 11, 7 transmission tower foundations collapsed and 1 foundation slanted along the Yusui Line (within Yulin City), resulting in a rare large-scale blackout phenomenon.…”