饱和铁心型超导限流器对电力系统保护的影响

作为超导技术最典型的应用方案超导限流器（SFCL）能改善短路电流随系统规模扩大而快速增长的严峻情况，保障电网的稳定以及电气设备的安全，但同时对继电保护装置的正常运行也带来了影响。本文首先简要介绍了饱和铁心型超导限流器的结构和工作原理，之后详细分析了在电力系统中加装SFCL后对电流保护、距离保护、零序电流保护和纵联差动保护造成的影响，并在此基础上提出修改保护的整定值以及提高对SFCL的设计要求等解决办法以消除其对上述保护的影响，为SFCL在电力系统中的实际应用提供了参考。

Effects of Saturated Iron-core SFCL on Power System Protections

As the most typical appliction of superconducting technology, superconducting fault current limiter (SFCL) can alleviate the serious situation that the short circuit current grows quickly with the expansion of power system, and ensure the stability of power grid as well as the safety of electric equipment. However, the normal operation of power system relay protection devices would be affected by the impedance characteristics of SFCL. For these problems, firstly the structure and the woking principle of saturated iron-core SFCL are introduced briefly. Then the influences of SFCL on circuit protection, distance protection, zero-phase circuit protection and longitudinal differential protection are analyzed.Finally, some corresponding solutions are proposed by modifying the setting value of protections and improving the design requirements of SFCL, These solutions provide a reference for the practical applications of SFCL.