Design And Experimental Study Of Concentric HTS Cable For 10 KV Urban Distribution

Resiliency of the electrical grid and its interdependencies with the nation’s other critical infrastructures have become increasingly essential,it’s also increase the criticality of the need for reliable electric service on demand.High temperature superconducting(HTS)cable has a series of advantages such as low line loss,large capacity,compact structure,and so on.It provides an efficient,compact and green way for power transmission.In this paper,two kinds of concentric HTS cables was designed and experimented for 10 kV urban distribution network application.The design principles of HTS cable parameters were expounded,the overall parameters of two concentric HTS cables were proposed according to the two typical application scenarios of 10 kV urban distribution network,transfers of large capacity of power supply and fault current limit for closed loop distribution network.The design methods of main insulation and current carrying layers of concentric HTS cable were proposed.And the AC loss and temperature distribution of HTS cable were researched.After all,a 30-meter 10 kV/2.5 kA concentric HTS cable was designed,made and tested to verify the effectiveness of the methods,and ensure the reliable in the power system application.The main innovations of this paper include:(1)The design of three-phase coaxial high temperature superconducting cable based on REBCO tape is carried out.A multi physical field simulation model coupling magnetic-thermal-fluid and a thermal stability analysis method of the superconducting cable are established.The engineering design of the cable is completed;(2)A feedback control method of insulation winding process parameters is proposed.A special winding technology of multi-layer insulation composite material is developed.The precise control of insulation winding of three-phase coaxial superconducting cable is realized.(3)The development of 30 m,10 kV/2.5 kA three-phase coaxial superconducting cable has been completed.The comprehensive test system has been established and the performance evaluation has been completed.The feasibility of the design method and process has been verified.The above work provides technical support for the application of high-temperature superconducting cable in urban power distribution network.