Abstract
A dc superconducting fault current limiting device can effectively limit the fast rising dc fault current and ensure the safety and reliability of the power grid. However, during the limiting period, the superconducting unit withstands the high voltage. Polymer film, kapton, and polytetrafluoroethylene (PTFE) have an excellent insulation performance at low temperature, which can solve the insulation problem. Quench and recovery is important characteristic, especially for the fault current limiting device. In this work, we measured the resistance development in YBCO tape with three insulation modes. In this work, a new insolating method for YBCO tape is investigated. We measured the resistance development in YBCO tape with three insulation modes. The experiment results show that the PTFE can be used, which can decrease the recovery time 30% ~ 50% than the naked one. As to the high-voltage superconducting fault current limiting device, the PTFE film can be put in the first layer, then twined the kapton film outside, which reduce recovery time about 20% ~ 40%.
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