摘要:发电机组由于造价昂贵，如果发生故障，不仅机组本身受到伤害，而且对系统产生严重的影响。因此，对大机组的继电保护必须设计，合理配置保护。着眼不仅限于机组本身，而且要从保障整个系统安全运行综合来考虑。发电机组的配置原则应该可以可靠地检测出发电机可能发生的故障及不正常运行状态为前提，本设计根据《继电保护和安全自动装置技术规程》300MW发电机组纵差动保护、横差动保护，定子绕组单相接地保护、转子接地保护、发电机失磁保护、20 Hz电压注入式100%定子接地保护；发电机电压闭锁过流保护；发电机不对称过负荷保护对其进行相应的整定原则并根据相应的要求进行整定计算。在保护的动作特性方面应考虑和机组的能力和匹配，快速动作时间应尽可能快。
关键词：发电机组；继电保护；整定原则；整定计算
Abstract:Generating units due to expensive, if a fault occurs, not only do harm to the unit itself, and has a serious effect on the system.Therefore, for large sets of relay protection must design, reasonable configuration of protection.Focus is not limited to the unit itself, but also to ensure the safe operation of overall system to consider.Generator set configuration principle should can reliably detect starting motor fault and normal operation condition is premise, "according to the design of relay protection and automatic safety device for" 300MW generator longitudinal differential protection, differential protection, stator ground fault protection, rotor grounding protection, the loss-of-excitation protection of generator, 20 Hz voltage injection 100% stator ground protection; generator voltage lockout overcurrent protection; generator asymmetric overload protection to its corresponding setting principle and the corresponding requirements for the setting calculation.In the protection movement characteristics should be taken into consideration and the unit's ability and the match, quick action time should be as fast as possible.
Key words: Generator; relay protection; setting calculation ; setting principles
发电机是现代发电厂主要设备之一，他同锅炉和气轮机统称为火力发电厂的三大主机。几乎所有的发电机，例如汽轮发电机、水轮发电机、核能发电机、燃气发电机及太阳能发电机等都属同步发电机， 所以交流电能几乎都是由同步发电机发出的，而在众多类型的发电机里，汽轮发电机使用最为广泛。
电力系统因不断发展而变得越来越庞大和复杂，他在运行中不可避免地发生各种故障和出现不正常运行状态，所以对电力系统中的各元件应装设各种相应保护。尤其是发电机。电力系统中，发电机是十分重要和贵重的电气设备，它的安全运行对电力系统正常工作、用户的不间断供电、保证电能的质量等方面，都起着极其重要的作用。由于发电机是长期连续运转的设备，它既要承受机身的振动，又要承受电流、电压的冲击。为了使同步发电机能根据故障的情况有选择地、迅速地发出信号或将故障发电机从系统中切除，以保证发电机免受更为严重的损坏，减少对系统运行所产生的不良后果，使其余部分继续正常运行，在发电机上装设能反应各种故障的继电保护是十分必要的。
