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### Experimental and Mathematical Modeling Studies on Current Distribution in High Temperature Superconducting DC Cables

 Title: Name(s): Experimental and Mathematical Modeling Studies on Current Distribution in High Temperature Superconducting DC Cables. 45 views 20 downloads Pothavajhala, Venkata, authorEdrington, Chris, professor directing thesisGraber, Lukas, committee memberAndrei, Petru, committee member Department of Electrical and Computer Engineering, degree granting department Florida State University, degree granting institution text Text monographic 2014 Florida State University Tallahassee, Florida computeronline resource 1 online resource English High temperature superconducting power cables have the advantage of high current density and low losses over conventional cables. One of the factors that affect the stability and reliability of a superconducting cable is the distribution of current among the tapes of cable. Current distribution was investigated as a function of variations in contact resistance, individual tape critical current (Ic), and index (n)-value of individual tapes. It has been shown that besides contact resistances, variations in other superconducting parameters affect current distribution. Variations in critical current and n-value become important at low contact resistances. The effects of collective variations in contact resistances, individual tape Ic, and n-values were studied through simulations using Monte Carlo method. Using an experimentally validated mathematical model, 1000 cables were simulated with normally distributed random values of contact resistances, individual tape Ics, and n-values. Current distribution in the 1000 simulated cables demonstrated the need for selecting tapes with a narrow distribution in the superconducting parameters to minimize the risk of catastrophic damage to superconducting cables during their operation. It has been demonstrated that there is a potential danger of pushing some tapes closer to their Ic before the current in the cable reaches its design critical current. Mathematical models were also used to study the effect of longitudinal variations in the tape parameters on superconducting cable using Monte Carlo simulations. Each tape of a 30 meter long, 3 kA model cable with 30 tapes was considered to have longitudinal variations in Ic, and n values for every 1 cm section, thus generating particular standard deviation in Ic and n for all 3000 sections of each tape. The results indicate that the apparent critical current and index value of the cable are reduced by a certain percentage depending upon the extent of variation in the characteristics along the length of the tapes. FSU_migr_etd-9071 (IID) A Thesis submitted to the Department of Electrical and Computer Engineering in partial fulfillment of the requirements for the degree of Master of Science. Summer Semester, 2014. June 24, 2014. Current Distribution, Hts Includes bibliographical references. Chris Edrington, Professor Directing Thesis; Lukas Graber, Committee Member; Petru Andrei, Committee Member. Electrical engineeringComputer engineering http://purl.flvc.org/fsu/fd/FSU_migr_etd-9071 FSU

Pothavajhala, V. (2014). Experimental and Mathematical Modeling Studies on Current Distribution in High Temperature Superconducting DC Cables. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9071