小型发电机阻抗型失磁保护原理及整定计算  

Theory of impedance-type loss of excitation protection for mini generators and setting determination

作　　者：罗风立 郑晓亚 任春生 

机构地区：[1]洛阳矿山机械工程设计研究院有限责任公司,河南洛阳471039 [2]矿山重型装备国家重点实验室(中信重工股份有限公司)

出　　处：《矿山机械》2010年第16期31-35,共5页Mining & Processing Equipment

摘　　要：失磁保护是发电机诸多重要保护之一,其作用是及时发现和切除由于励磁系统故障引起的发电机异常运行和故障。其构成原理主要有阻抗型和逆功率+过电流型2种类型,因此,以经典阻抗型失磁保护理论为依据,重点阐述了发电机失磁过程中机端阻抗的变化轨迹,并以此为基础,针对小型发电机的失磁保护进行整定计算。Loss of excitation protection is one of many important protections for generators,it can timely discover the abnormal operations and malfunctions caused by fault of excitation system and then cut down the generator from trouble.Its constitutional principle has two types,one is impedance type and the other is reverse power added with over current.With the theory of typical impedance type loss of excitation protection serving as the foundation,the paper expounded the variation path of impedance measured at a generator terminal during the loss of excitation of generator,and based on which to carry out the setting determination for the loss of excitation protection for mini generators.

关 键 词：失磁保护 静稳边界 异步运行 阻抗圆 

分 类 号：TM31[电气工程—电机]