课程设计(论文)35KV电网继电保护设计.doc
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1、摘 要当电力系统中的电力元件,如发电机、线路等或电力系统本身发生了故障危及电力系统安全运行时,能够向运行值班人员及时发出警告信号,或者直接向所控制的断路器发出跳闸命令以终止这些事件发展的一种自动化措施和设备,一般通称为继电保护装置。继电保护的基本任务:(1)当被保护的电力系统元件发生故障时,应该由该元件的继电保护装置迅速准确地给脱离故障元件最近的断路器发出跳闸命令,使故障元件及时从电力系统中断开,以最大限度地减少对电力系统元件本身的损坏,降低对电力系统安全供电的影响,并满足电力系统的某些特定要求,如保持电力系统的暂态稳定性等。(2)反应电气设备的不正常工作情况,并根据不正常工作情况和设备运行维
2、护条件的不同,例如有无经常值班人员,发出信号,以便值班人员进行处理,或由装置自动地进行调整,或将那些继续运行会引起事故的电气设备予以切除。反应不正常工作情况的继电保护装置允许带一定的延时动作。继电保护的基本原理和构成方式。继电保护主要利用电力系统中元件发生短路或异常情况时的电气量,电流、电压、功率、频率等的变化,构成继电保护动作的原理,也有其他的物理量,如变压器油箱内故障时伴随产生的大量瓦斯和油流速度的增大或油压强度的增高。大多数情况下,不管反应哪种物理量,继电保护装置都包括测量部分和定值调整部分、逻辑部分、执行部分。关键词:继电保护 短路 电力系统 AbstractWhen the elec
3、tric power component,such as generator, circuit etc. In the electric power system or electric power system breakdown happened to endanger electric power system a safety movement, can to circulate the personnel on duty send out warning signal in time, or issue to give a order to jump switch with a ki
4、nd of automation measure and equipments which terminates these affairs a development toward the chopper controled directly, general general name for protection equip.protection equip basic mission:(1)While the protective electric power system component break down, should from that component of after
5、 electricity the protection equip quickly and accurately to escape from breakdown the component recent chopper to issue to give a order to jump switch, make breakdown component in time the interruption open from the electric power system to reduce the damage toward the electric power system componen
6、t with maximum limit, lowering the influence to the electric power system safe power supply, and satisfy the some and particular request of electric power system such as keep electric power system temporary a stability etc.(2)The iniquity which responds an electricity equipments often works circumst
7、ance, and according to often work falsely circumstance and equipments circulate a maintenance conditional of dissimilarity, for example whether have or have not a personnel on duty, send out signal, in order the personnel on duty carry on a processing, or is carried on adjustment of oneself by the d
8、evice, or cut off those electtric equip which will cause trouble if they continue to work.Respond falsely often work circumstance of after give or get protect equip to allow to take to certainly postpone act.Protect equip basic principle and the composing method.Protect equip mainly make use of elec
9、tric power system to measure electric current, electric voltage, power, frequency.etc. in the electricity for component to take place short-circuit or excrescent circumstance of variety, constitute to protect operative principle after the electricity, also have other of physics quantity, if break do
10、wn inside transformer fuel tank accompany with aggrandizement or hydraulic-pneumatic strength of a great deal of output gas and oil current velocity degree to increase high.Under most circumstances, ignore respond which physics quantity, protect equip includes measure after the electricity part with
11、 settle value adjust part, logic part, performance part.Keyword: Protect equip short-circuit electric power system after the electricity目 录摘 要IAbstractII第一章 35kV电网继电保护设计原始资料1第二章 短路计算32.1 标么值的选取:32.2最大方式下的短路阻抗标么值计算:32.3最小方式下的短路阻抗标么值计算:4第三章 继电保护整定63.1 保护的整定计算63.1.1保护的段:63.1.2 保护的段:73.1.3保护的段:73.2对保护进行
12、整定计算73.2.1 保护的段:73.2.2保护的段:83.2.3 保护的段:83.3保护3进行整定计算:93.3.1 保护的段:93.3.2 保护的段:103.3.3 保护的段:103.4、对保护进行整定计算103.4.1保护的段:113.4.2 保护的段:113.4.3 保护的段:123.5对保护进行整定计算123.5.1 保护的段:123.5.2 保护的段:133.5.3 保护的段:133.6对保护进行整定计算143.6.1 保护的段:143.6.2 保护的段:与保护4的段配合:153.6.3 保护的段:153.7方向元件的安装:153.8自动重合闸16结 论17致 谢18参考文献19第
13、一章 35kV电网继电保护设计原始资料主要技术参数:某地有金河和青岭两座电站,装机容量分别为12MW和8MW,各以单回35kV输电线路向城关变电所供电。金河电站还以一回35kV联络线经110kV中心变电所与省电网连接。35kV电网的接线示意如下:主要参数见下表:1. 发电机:额定容量Se(kW)额定电压Ue(kV) 功率因数暂态电抗X”d标么电抗X*F30006.30.80.20.3334000 6.30.80.242. 主变压器:额定容量Se(kVA) 接线组别短路电压Ud%标么电抗X*B7500Y,dll7.5110000Y,dll7.50.7510000Y,dll7.50.7520000
14、Yn, yno, dllX*1=0.55X*2=0X*3=0.353. 输电线路:名称导线型号长度(km)电抗标么值有名值()金中线LGJ-120401.16816金城线LGJ-120100.2924青城线LGJ-120300.87612最大运行方式:两电站的六台机组全部投入运行,中心变电所在地110kV母线上的系统等值标么电抗为0.225。城关变电所总负荷为240A(35kV侧),由金河电站供给110A、青岭电站供给130A。剩余的110A经中心变电所送入系统。最小运行方式:两电站都只有一台机组投入运行,中心变电所110kV母线上的系统等值标么电抗为0.35,城关变电所总负荷为150A(35
15、kV侧),由金河电站供给40A、青岭电站供给65A。剩余的15A经中心变电所送入系统。设计内容:1.短路电流计算2.35kV电网继电保护配置设计3.35kV输电线路断电保护回路设计完成资料:1、设计说明书一份(1520页)工作量: 2周第二章 短路计算2.1 标么值的选取:Sj=3000KW Uj=6.41KV Ij=270.181A Xj=13.6992.2最大方式下的短路阻抗标么值计算:等效电路图:X1*=(0.333/2+1)/2=0.583X2*=4/2+0.75=2.75X3*=0.225+0.55=0.775XL1*=1.168XL2*=0.292XL3=0.876换算成有名值:I
16、Amax=Ij/ XA*=673.768AIBmax= Ij / XB*=439.319AICmax= Ij / XC*=428.859AIDmax= Ij / XD*=275.133A2.3最小方式下的短路阻抗标么值计算:等效电路图:XA*=X1*/(X3*+XL1*)/(X2*+XL3*+XL2*)=0.401XB*=(X2*+XL3*)/X1* /( XL1*+X3*)+ XL2*=0.615XC*=( X2*+XL3*+XL2*)/ X1*+ XL1*=0.630XD*=( XL1*+X3*)/ X1*+ XL2*+ XL3*/ X2*=0.982换算成有名值IAmin=Ij/ XA*
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