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1、*大学毕业设计（论文）说明书 摘 要本论文主要讲述的是110kV变电站继电保护的配置，整定计算。目前，110kV变电站主要是直接向广大用户供应和分配电能，是包括发电、输变电和配电在内的整个电力系统的最终环节。由于电力系统具有发、供、用同时的特点，一旦配电系统发生故障，将造成系统对用户供电的中断，同时也有可能使整个电力系统受到影响，甚至被破坏,造成巨大的经济损失。因此，必须提高110kV配电系统的可靠性，给变电站的设备装设动作可靠、迅速、性能完善的保护，把故障影响限制在最小范围内， 保证向用户提供持续的电能。电力系统继电保护和安全自动装置是电力系统的重要组成部分。它对电力系统安全稳定地运行和对用
2、户的不间断供电起着极为重要的作用，没有继电保护的电力系统是不能运行的。电力系统继电保护的设计与配置是否合理直接影响到电力系统的安全稳定运行。如果设计与配置不当，继电保护将不能正确动作，从而会扩大事故的停电范围。给国民经济带来严重的恶果，有时还可能造成人身和设备安全事故。因此，为了保证110kV变电站的正常运行，必须根据规程来设置变电站所需要的保护装置，并根据满足选择性、速动性、灵敏性、可靠性进行整定值，使整个系统的各种继电保护有机协调地布置，正确地发挥作用。设计共分为六个章节，第二章给出了系统的原始数据并确定了主接线方式；第三章介绍了各种继电保护的原理；第四章为短路计算，确定系统短路时的短路电
3、流；第五章为整定计算，为系统配备的各种继电保护整定出动作值。其中变压器的主保护包括瓦斯保护和纵联差动保护,后备保护包括复合电压启动过电流保护、零序电流保护和过负荷保护。母线配备了母线完全电流差动保护，简单可靠。110kV侧线路配备了三段距离保护，35kV侧配备了三段距离保护和电流速断保护，10kV侧只设置了电流速断保护即可满足要求。关键词：配电系统, 变电站, 电力系统继电保护, 短路电流，整定计算AbstractWhat this text mainly told is system disposition of relay protection of 110kV distribution,
4、 calculate whole definitely. At present, 110kV transformer substation to supply the masses of users with and assign the electric energy directly mainly, it is the final links of the whole power system including generate electricity , the power transmission and transformation and distribution. Becaus
5、e the power system takes place, supports, uses the characteristic at the same time , once the distribution system breaks down, the ones that cause the system to supply power to users break down, may make the whole power system influenced at the same time , even destroyed, cause the enormous economic
6、 losses. So must improve 110kV distribution dependability of system, apparatus to give transformer substation install movement reliable , rapidly , complete protection of performance, influence the trouble to confine to minimum range, guarantee to offer the lasting electric energy to users.The relay
7、 protection of power system and security automatics are important components of the power system. It operates and plays an extremely important role safly in users incessant power supply steadily in the power system, the power system without relay protection can not run . The peace and steadiness tha
8、t design and disposition of relay protection of power system influence the power system directly rationally runs . It design and it is the improper since it dispose,relay protection can movements correct,it thus not will expand by power cut range of accident. Bring the serious evil consequence to na
9、tional economy, may also cause the apparatus incident of personal sum sometimes. So for guarantee 110kV normal running of transformer substation , must follow rules come , set up protector transformer substation need, and moving , sensitivity , dependability carry on whole definite value according t
10、o the alternative of meeting, rapidly, make various relay protection of the whole system fix up organically coordinating , function correctly. Design is divided into six chapters, the system is given in chapter II of the original data and determine the main wiring; third chapter describes the princi
11、ples of various relay; fourth chapter short circuit calculations, determine the systems short circuit short circuit current; fifth chapter setting calculation, the system is equipped with a variety of protective relaying action value set. In which the main transformer protection, including gas conse
12、rvation and differential protection, backup protection, including composite voltage start over-current protection, zero sequence current protection and overload protection. Bus equipped with a bus full current differential protection, simple and reliable. 110kV side of the line with three distance r
13、elay, 35kV side with three distance relay and Current Protection, 10kV side only set the trip current protection requirements can be met.Keyword: distribution system , transformer substation , power system relay protection, short circuit electric current, complete calculation目 录1 绪论11.1 继电保护的作用11.2
14、继电保护系统设计基本要求21.3 继电保护装置的组成32 原始数据及主接线介绍52.1 主变压器及线路主要参数52.2 变电站电气主接线简介73 继电保护原理介绍93.1 变压器保护93.1.1 纵联差动保护93.1.2瓦斯保护133.1.3复合电压启动过电流保护143.1.4 零序电流保护153.1.5过负荷保护153.2 母线保护163.3 线路保护173.3.1 三段式电流保护173.3.2相间距离保护204 短路电流计算224.1短路计算说明224.2母线短路电流计算224.2.2三相对称短路时的电流计算234.2.3不对称短路的电流计算254.3线路短路电流计算274.3.1各线路阻
15、抗参数274.3.2110kV线路短路电流计算274.3.335kV线路短路电流计算294.3.410kV线路短路电流计算315 整定计算335.1线路最大负荷电流计算335.2主变压器保护的整定计算355.2.1纵差动保护整定计算355.2.2 复合电压启动过电流保护的整定计算375.2.3 过负荷保护的整定计算385.3 母线保护的整定计算385.4 线路保护的整定计算415.4.1 110kV线路保护的整定计算415.4.2 35kV线路保护的整定计算435.4.3 10kV线路保护整定计算476 总结51致谢52参考文献53521 绪 论1.1 继电保护的作用电力系统在运行中，可能发生各种故障和不正常运行状态，最常见同时也是最危险的故障是发生各种型式的短路。在发生短路时可能产生以下的后果：1. 通过故障点的很大的短路电流和所燃起的电弧，使故障元件损坏；2. 短路电流通过非故障元件，由于发热和电动力的作用，引起它们的损坏或缩短它们的使用寿命；3. 电力系统中部分地区的电压大大降低，破坏用户工作的稳定性或影
