超导限流器可以快速有效地限制短路电流,提高电网运行的安全可靠性.以某正在研制的500 kV超导限流器样机为对象,样机研制阶段采用铜绕组常导代替超导励磁,通过试验模态分析方法研究了其本体和油箱的固有振动特性,构建了基于光纤传感的超导限流器本体振动测试系统,测试分析了稳态运行时超导限流器样机的本体及油箱振动特性.结果表明限流器振动频谱中包含大量高次谐波,具有典型的电力变压器直流偏磁振动特征,在限流器结构动态设计阶段,有必要对主要部件进行试验模态分析,避免其在运行过程中发生高次谐波共振;限流器油箱与本体振动强度较大,且特征并不完全吻合,研制、试验及运行过程中都应进行在线监测.%Superconducting fault current limiter(SFCL) can offer rapid and effective current limitation, which is used to improve the reliability and security of electric power network.Experimental modal analysis is performed on a prototype of saturated core superconducting fault current limiter to study the natural characteristics of iron core/winding, and tank of the SFCL.A special vibration measurement system is constructed to investigate the characteristics of SFCL, in which fiber optic sensors are used to directly measure the core and winding vibration.The results show that the vibration spectrum of SFCL during normal operation consists of many high order harmonics with typical vibration characteristics of transformers under DC bias.It indicates that it's of great necessity to conduct experimental modal analysis on SFCL's key components during the stage of structure dynamic design to keep them away from resonance caused by high order harmonics, and the vibration of SFCL's core/winding and oil tank should be monitored on-line during development, test, and operation as both of them have to withstand high intensity vibration with different properties.
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