Abstract
In order to determine whether the mechanical performance after the fires of high voltage transmission lines meets the requirements of normal use, this article simulates the wildfire, and does the mechanical performance experiment of high voltage transmission lines(HVT lines) after the simulated wildfires. The experiment studied the breaking force and elongation of each layer of 500kv HVT lines after the simulated wildfire. Experimental results show that, after fires, each layer of single aluminum wires of 500kv HVT lines have low breaking force which can be decreased obviously to half of that of new lines. For the steel core, decrease of breaking force is not obvious than aluminum wires, and with the increasing degree of wildfires, it increases gradually to a maximum of 35% of new steel lines’ breaking force. After wildfires, aluminum lines’ resistance ability of deformation decreases significantly, and its plastic deformation increases obviously during uniaxial tension. The steel core has little plastic deformation, and layers of aluminum become fluffy after fires. Therefore, the steel core main bearing load after wildfires.
Highlights
High voltage transmission lines is the lifeline of the national power grid and closely related to the National People's livelihood, but at the same time, high voltage transmission line is so fragile that any damage can cause large area blackout and even collapse [1]
Wildfires are a serious threat to the safety of the HVT lines and the power grid
In the course of the experiment, we found that tensile curves of all aluminum lines have no obvious yield stage and reinforcement service stage, and the plastic deformation is very small
Summary
High voltage transmission lines is the lifeline of the national power grid and closely related to the National People's livelihood, but at the same time, high voltage transmission line is so fragile that any damage can cause large area blackout and even collapse [1]. Extreme weather caused a lot of fire accidents which is a threat to the safety of forest, personnel and property in the fire area, and affects the safety and reliability of HVT lines through the forest. Wildfires are a serious threat to the safety of the HVT lines and the power grid. Except leading to tripping accidents, wildfire can cause serious impact on HVT lines. Because of the influence of high temperature, the tensile strength and the Conductive properties of HVT lines may be partly affected. The strength, if the strength decreases obviously, it will constitute a major hidden danger of transmission security
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