Mechanical Analysis Of Large Section Cross-linked Polyethylene Cable Pipe Laying And Calculation Of Current Carrying Capacity

High-voltage power cable is one of the important power equipment in power transmission.With the continuous development of urbanization and power grid technology in China,high-voltage cables account for a larger proportion of transmission lines.When long-distance transmission lines pass through complex environments,underground pipelines are required.Due to the complexity of the pipeline environment,the optimization analysis of the high-voltage cable during the laying of the pipeline and after the laying is very necessary for the safe and stable operation of the cable.In the case before the pipeline is laid,there is no clear calculation formula for the traction force of the cable under the laying of the pipe.This problem brings many troubles for the engineering laying.In the pipeline laying mode,the cable is densely arranged in the pipeline,especially the laying environment in the pipeline is more complicated,and the complexity of the laying environment is often a bottleneck that limits the current carrying capacity of the cable.In view of the above problems,it is necessary to carry out optimization analysis under the pipeline laying,and then provide auxiliary reference for the operation and management of the grid company.In this paper,we first establish a drop-down pipe laying model for different situations,derive the linear formula of the model according to the model,and then analyze the traction force of the cable under the laying mode,derive the traction formula under different models,and simplify the traction formula,using the formulato calculate Verify the accuracy of the simplified formula.According to the simplified model,the longest distance under different conveying modes of cable laying is calculated,and the traction formula of cable drawing is laid out.In the case of improving the current carrying capacity of pipeline laying cables,the most complicated pipe laying cable group in the environment is taken as an example.The method of using the cold water pipe and the blowing cold air flow to improve the cable current carrying capacity is analyzed,and the forced cooling mode is derived.The calculation formula of the current carrying capacity of the cable verified the feasibility of increasing the current carrying capacity of the cable through calculation.In the optimization of cable current carrying capacity in pipeline laying,taking the most complicated pipe laying cable group in the environment as an example,the method of using the cold water pipe and the blowing cold air flow to improve the cable current carrying capacity and the way of laying the pipe is analyzed.The cable loss and the surrounding thermal resistance are calculated.The calculation formula of the current carrying capacity of the cable under the forced cooling mode is derived.The feasibility of the large cable current carrying capacity is verified by calculation.The temperature field model of the cable-discharge group under forced cooling mode is established,and the temperature field of the cable-discharge group under the forced cooling mode is simulated.The iterative algorithm is used to calculate the current-carrying capacity when the conductor temperature reaches the maximum temperature.The factors affecting the current carrying capacity of the cable under forced cooling laying mode are studied,and the relationship between the influencing factors and the cable current carrying capacity is simulated by simulation to make the cable current carrying capacity reach the maximum value.In this paper,the optimization analysis of high-voltage cable under the pipeline laying mode provides a theoretical basis for laying cable traction force and the large current carrying capacity of the cable group,and provides an auxiliary reference for the power sector to give full play to the cable transmission capacity.