300WM发电机组变压器继电保护_本科毕业设计说明书.doc

本科毕业设计说明书 300WM发电机组变压器继电保护 300WM Generator transformer relay protection 设计概况 电力系统继电保护的设计与配置是否合理会直接影响到电力系统的安全运行，所以必须合理地选择保护配置和进行正确的整定计算。 本次设计要求为2×300MW发电机组变压器配置继电保护和自动装置，目的为通过本次设计，进一步加深对所学知识的理解，以及理解保护与保护之间的配合问题。 大型发电机主变压器的造价昂贵，结构复杂，一旦发生故障遭到破坏，其检修难度大，检修时间长，要造成很大的经济损失。特别是单机容量占系统容量很大比例的情况下，大机组的突然切除，会对电力系统造成很大的扰动。所以它的安全运行是电力系统可靠工作的必要条件。电力变压器有别于发电机，它无旋转部件，是一种静止的电气设备，是连续运行的，停电机会很少，而且绝大部分安装在室外，受自然环境影响较大。另外，电力变压器时刻受到外界负荷的影响，特别是受电力系统短路故障的威胁较大。因此，电力变压器在运行中，仍然可能发生各种类型故障或出现不正常的工作状态。它的故障对电力系统的安全连续运行会带来严重影响，特别是大容量变压器的损坏，对系统的影响更为严重。 为了保证供电的可靠性和连续性，必须根据电力变压器容量的大小、电压的高低和重要程度设置性能良好、动作可靠的继电保护装置。 关键词：发电机组变压器;自动装置；整定计算；可靠性；连续性 300WM Generator transformer relay protection Design Overview Power system relay protection design and configuration is reasonable or not will directly affect the safe operation of power system, so we must rationally select the protection configuration and setting calculation are correct. The design of 2 × 300MW generator transformer relay protection and automatic device, for the purpose of the design, to further deepen the understanding, and the understanding of the matching problems between protection and protection. Large generator main transformer is expensive, complex structure, once malfunction destroyed, it is difficult to repair, maintenance time is long, will cause great economic losses. In particular system capacity capacity accounted for a large proportion of the cases, a large unit suddenly cut off, will to power system caused great disturbance. So its safe operation of electric power system reliability is a necessary condition. Power transformer is different from the generator, it has no rotating parts, and is a static electrical equipment, is the continuous operation of the power outage, few opportunities, but most are installed in the outdoor, natural environment influence. In addition, power transformer by the time of external load effects, in particular by power system short circuit fault of a greater threat. Therefore, power transformer i