前言　　为了适应电力系统继电保护技术的快速发展，提高继电保护从业人员的业务素质，华东电管局、江苏电力局委托我校开办继电保护高级工培训班。继电保护高级工班的培训分3个阶段：理论教学阶段、技能培训阶段和跟踪调查阶段，其中前两个阶段在学校进行。这里将我们在培训教 Preface In order to adapt to the rapid development of power system relay protection technology and improve the professional qualities of relay protection practitioners, East China Electricity Board and Jiangsu Power Bureau commissioned our school to start the relay protection senior workers training course. There are three stages in the training of the senior working class of relay protection: the theoretical teaching stage, the skill training stage and the follow-up investigation stage, of which the first two stages are carried out in schools. Here we will teach training