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

摘要

A 66kV-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 66kV-class equipment . To minimize insulation layer thickness, the dielectric characteristics of this EPR were investigated in detail. The specimens were made 0.3–10mm 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.