大型核电机组SiC灭磁电阻容量的选择

Planning of Capacity Configuration for SiC De-excitation Resistors in Large Nuclear Power Units

根据SiC电阻的伏安特性及灭磁回路拓扑结构,在理想情况下对励磁电流与灭磁时间的函数关系进行了推导并给出了SiC电阻耗能公式,分别对空载误强励和机端三相短路两种极端灭磁工况的灭磁电阻耗能作出了理论分析,依据计算结果提出灭磁电阻容量配置应重点考虑第二种工况。

The functional relationship between field current and suppression time of SiC resistors was derived in ideal situation, according to the volt-ampere characteristics and the field suppression topology, based on which an energy consumption formula was given. Meanwhile, a theoretical analysis was conducted on the energy consumption of SiC resistors for field suppression under two extreme conditions, such as no-load fault forcing excitation and three-phase short circuit at generator terminals, etc. It is suggested that the second condition should be mainly considered in the planning of capacity configuration for SiC de-excitation resistors.