Modeling Ice Shedding Propagation on Transmission Lines with or without Interphase Spacers

Abstract

Abstract-Ice shedding propagation on a single conductor and on a circuit of three conductors in a vertical configuration where conductors are linked with interphase spacers was modeled numerically. Several concentrated loads acting along the loaded span modeled the ice, and the shedding propagation was then simulated through the removal in a defined sequence of these concentrated loads. The model determines conductor displacement and the variation of conductor tension during the vibration following ice shedding propagation; and thus, it predicts conductor rebound height, tension peak, and to what extent the conductor clearance is reduced during vibration. Ice shedding propagation on the full-scale test line of Hydro-Quebec was considered, and the model was validated by comparing simulation results to former experimental observations. Results show that the application of spacers reduces the severity of vibration considerably, and consequently increases the conductor clearance and reduces the risk of flashover. The dynamic effects of different shedding processes were also compared. The rebound height is the greatest for a single conductor when ice detachment propagates along the conductor, but then ice falls suddenly as a big chunk. However, the consequences of sudden detachment and shedding are obtained the most severe when conductors are linked with spacers.

A Numerical Approach for Hybrid Simulation of Power System Dynamics Considering Extreme Icing Events

“…2) Weather information 6 The input weather information around transmission lines includes ambient temperature, precipitation and wind speed. The curves of temperature and precipitation changes are shown in Fig.…”

“…and insulator flashover [6]. Evaluating the impacts of extreme icing weather events on power systems is an important issue related to power system security and risk assessment [7], [8].…”

Modeling of Ice-Shedding from ACSR Power Line

“…in [3] the simulation of the dynamic responses of transmission lines with different parameters after ice-shedding by means of FEM. In [4,5] the dynamic behavior of bundle conductors and five-span line section after ice-shedding is numerically simulated. In [1], a new theoretical method to calculate the jump height of the overhead power line after ice-shedding is presented.…”

Dynamic Analysis of Overhead Power Lines after Ice–Shedding Using Finite Element Method

“…With the improvement of computational mechanics, numerical simulation methods (over all the FEM) were used to study ice-shedding from the power lines eg in [5][6][7] dynamic responses of transmission lines with different parameters, bundle conductors and five-span line section after ice-shedding is numerically simulated. In [8], a new theoretical method to calculate the jump height of the overhead power line after ice-shedding is presented.…”