Economical-technological Comparison And Optimization Of Reinforced Concrete Cable Duct

When a high voltage core cable operates,it will generate magnetic and Joule and magnetic losses in the steel reinforced concrete duct.These losses including that of the cable itself will influence the distribution of the temperature field.In order to solve the electric energy loss which is generated from the eddy current in traditional underground steel reinforced duct structures,a finite element model and method was proposed to analyze the eddy current field and temperature field in the complex underground environment and a scheme of using the Glass Fiber Reinforced Polymer(GFRP)instead of the steel in the underground duct was proposed.Moreover,the three-dimensional eddy current-temperature coupled field was computed by adopting a fast convergence,high accuracy mesh technique and an iteration solver for the coupled multi-physics field.The eddy current distribution of the metal component,the temperature field distribution of the whole model were obtained;also the temperature of the cable cores under a harmonic current condition was analyzed.By comparing the technical and economic performances of the traditional and proposed models,it was concluded that the scheme of using GFRP instead of steel can reduce the loss,and possess better economic performance at the same time.