Providing an effective guarantee for power transmission quality and stability in power system, high temperature superconducting fault current limiter (SFCL) is an effective device to solve the problem of short circuit fault in power girds, due to the superior properties of self-triggered, high current limiting ability and low normal operation loss. In this paper, a mathematical model for the dependence of transient resistance of resistive type superconducting current limiting unit (SCLU) on its transport current and ambient temperature is built, by analyzing the electrical and thermal properties of YBCO superconductor. In order to investigate the law of the current limiting ability of SFCL with suffering fault current in the power grid, PSCAD/EMTDC and Matlab have been combined to simulate this behavior. PSCAD/EMTDC is used for line modeling and short circuit fault operation simulation and Matlab is used to build the superconducting equivalent mathematic model. According to the analysis of numerical transient simulation, current-limiting ratio in high temperature SFCL, resistance variation characteristic in SCLU and temperature variation characteristic in SCLU are obtained, under the condition of single-phase short-circuit fault and three-phase short-circuit fault , respectively. Moreover, for verifying the law of resistance variation, the superconducting tape is subjected to the impact current test. Calculation and analysis results show that, transient resistance of high temperature SFCL is greatly influenced by short-circuit current amplitude and its rate of change, when facing with different intensity of short-circuit impact current. Considering the growth of rate of change in current will accelerate the variation of resistance of superconducting material, for different short current in circuit, the current-limiting process and protective strategy of high temperature SFCL should be different. The work in this paper contributes references to distance protection of high temperature SFCL on time dimension, which is of significant reference for mastering the current limiting characteristics of high temperature SFCL with various complex topologies.
龚珺, 诸嘉慧, 方进, 陈盼盼, 丘明. 电阻型高温超导限流器暂态电阻特性分析[J]. 电工技术学报, 2018, 33(9): 2130-2138.
Gong Jun, Zhu Jiahui, Fang Jin, Chen Panpan, Qiu Ming. Analysis of Transient Resistance Characteristics for Resistive Type High Temperature Superconducting Fault Current Limiter. Transactions of China Electrotechnical Society, 2018, 33(9): 2130-2138.
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2018, Vol. 33 
