Dynamic Characteristic of Conductor After Ice-Shedding and Simulation Analysis of the Tension Insulator String

Abstract

Electric power fittings are the link between conductors and transmission towers, and it is essential to improve their ability to withstand damage. In order to obtain the actual load of electric power fittings and study the stress of each electric power fitting under the actual load, a transmission line model of catenary-shaped and an integral model of tension insulator string are established in this paper. Then, conductors with uniform thickness of ice coating and ice shedding process are simulated by changing density method. The results show that the maximum dynamic tension of the conductor of isolated span transmission line is greater than the static tension of conductor icing only when the length of ice-shedding section is small. Under any ice-shedding condition, the maximum dynamic tension of the conductor of multi-span transmission line will be close to or greater than the static tension after conductor icing. When the form conductor tension is loaded on the tension insulator string, it can be found that the most dangerous and secondary dangerous fittings in the tension insulator string are found, and the stress analysis is carried out on the key connecting fittings, which provides a reference for the design and optimization of electric power fitting.

Study on the Maximum Ice-Shedding Height of Conductor Based on Energy Method

“…After the transmission line is covered VOLUME 11, 2023 with ice, the tension and displacement of the line change from state I to state II, and the displacement can be calculated according to Eq. ( 6) [20].…”

“…( 18) and ANSYS numerical simulation increases with the sag increase. According to the theory of cable structure [20], the high-order vertical frequency has a greater contribution to the dynamic tension for TLs with large vertical span ratios. Only considering the 1st-order frequency to calculate the response of TLs with a large vertical-span ratio after ice shedding may lead to larger calculation results.…”

“…The simulation results show that the shock absorber can reduce the vibration jump height of the de-icing vibration. In the past decade, researchers have more widely used finite element methods to study the jump height and tension of TLs with various ice-shedding and structural parameters [8], [15], [16], [17], [18], [19], [20], [21]. In addition, machine learning is a new method to study the dynamic response of TLs after ice-shedding [8], [12], [22].…”