Dielectric Characteristics of EPR for 66 kV-Class Power Leads of High-Tc Superconducting Fault Current Limiter

• Published in: IEEE transactions on applied superconductivity Vol. 16; no. 2; pp. 1790 - 1793
• Main Authors: Sakai, M., Kaneiwa, H., Koyama, H., Yazawa, T., Urata, M., Tokunaga, Y., Inoue, K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Connection and protection apparatus; Crack propagation; Current limiters; Dielectric breakdown; Dielectric measurements; Dielectrics; Dielectrics and electrical insulation; Electric breakdown; Electric power generation; Electric resistance; Electrical engineering. Electrical power engineering; Electrical insulation; Electrical power engineering; Electronics; ethylene-propylene rubber; Exact sciences and technology; Fault current limiters; Faults; high-Tc superconducting; Insulation; Miscellaneous; Paramagnetic resonance; power lead insulation; Power networks and lines; Power system modeling; Rubber; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Superconducting devices; Superconducting epitaxial layers; Superconductivity; Temperature measurement; V-t characteristic; Electric breakdown; V-t characteristic; Protective device; Electrical insulation; Superconductor device; Layer thickness; Fault current limiters; Damage prevention; power lead insulation; High power; Electrical network; high-Tc superconducting; Dielectric breakdown; ethylene-propylene rubber; Filler; High temperature superconductor; Room temperature; Electrical characteristic; Damaging; Crack
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2006.873247

A 66 kV-class power lead insulation system has been developed for high-Tc superconducting fault current limiters (SCFCL). The power leads are insulated with ethylene-propylene rubber without organic filler, and have excellent crack resistance. This system was evaluated by an insulation model and was shown to have strong enough electrical insulation properties for 66 kV-class equipment. To minimize insulation layer thickness, the dielectric characteristics of this EPR were investigated in detail. The specimens were made 0.3-10 mm thick: near the thickness of an actual power lead insulation layer. The breakdown stress was measured at room temperature and at liquid nitrogen temperature. The V-t characteristic was also measured. Based on the study, the power lead insulation model was constructed and its electrical insulation properties were evaluated