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1、沙河子变电所继电保护设计I摘要配电网络是电力系统中连接输电网络和用户侧的中间环节,直接为广大用户提供电能。与输电网络相比,配电网络具有电压等级低、损耗大、自动化程度低等特点。配电网络的运行工况是否安全、合理,不仅关系到用户侧电能可靠性的优劣,而且还直接影响网络运行的安全性和经济性。对配电网络整定计算进行研究,具有非常重要的实际意义。配电网络的整定计算主要是短路电流计算。本次设计是针对 10kV 变电所的电气部分及继电保护而进行设计的。电气设计主要是根据原始资料所提供的有关情况,并考虑到变电所在电力系统中所处的地位其所处的地理环境及其电能的输送情况,通过分析并经过技术经济比较,确定出合理的电气主
2、接线方案,选择适当的电气设备。继电保护部分是本次设计的重点。10kV 属于中压配电网,它延伸至用电负荷的中心或居民小区内,直接面对工矿企业和居民等广大用户的供电需要,起着承上启下确保用户供电的作用,因此 10KV 配电网所处的地位十分重要,在配电工程中,能否保证系统安全、经济、可靠的运行,工程的设计质量是一个重要条件。关键词 继电保护,速断保护,短路电流计算,整定计算毕业设计(论文)IIAbstractThe distribution network is in power system and power transmission network connection among the l
3、ink directly to the vast number of users with electricity. Compared with the transmission network, with low voltage distribution network, the loss is big, the low degree of automation. The operating condition of the distribution network security, whether reasonable, is not only related to the user,
4、the reliability of the lateral power but also directly affect the safety of network operation, and the economy. The calculation of the distribution network research, has very important practical significance. The calculation of the distribution network is mainly short-circuit current calculation.The
5、 design is for 10 kV regional electrical substation and part of the relay and design. Electrical design are mainly based on raw provided by the situation and taking into account the substation in the power system in which the position in which its geographical environment and its power transmission,
6、 through a technical and economic analysis and comparison, determine a reasonable Electric Wiring the main programme, select the appropriate electrical equipment. Relay protection is part of the focus of this design. 10kV belong to the pressure distribution network, which extends to the electricity
7、load centres or residential area, directly face the industrial and mining enterprises and residents and other users of electricity needs, to ensure that users connecting link between the preceding play the role of power supply, power distribution network by 10 kV The position is very important, the
8、power distribution projects, can guarantee security, economic and reliable operation, the design quality is an important condition.KeyWords relay protection, instantaneous over current protection, short-circuit current calculation, setting calculation沙河子变电所继电保护设计目录摘要 .IAbstract.II目录 .1第一篇 说明书 .11 前言
9、 .11.1 继电保护基本要求 .11.2 初步保护方案 .32 保护运行方式的确定 .52.1 运行方式的基本概念 .52.2 短路电流计算 .62.3 保护方式确定 .83 整定计算及灵敏度校验 .103.1 整定计算运行方式的选择原则 .103.2 与继电器整定有关的概念 .103.3 变压器各保护整定分析 .113.4 线路各保护整定分析 .184 继电保护的配置 .234.1 继电保护的基本知识 .234.2 变压器的保护配置 .254.3 配电线路的继电保护配置 .314.4 其它保护 .394.5 保护设备 .405 保护清单 .425.1 各元件参数及短路电流计算结果表 .425.2 保护定值清单 .445.3 设备选择表 .445.4 动作时限配合图 .47第二篇 计算书 .491 短路电流计算 .491.1 标幺值计算 .491.2 短路电流计算 .501.3 确定运行方式 .552 保护整定计算 .572.1 变压器保护的整定计算 .572.2 配电线路保护的整定计算 .62毕业设计(论文)结论 .66变压器各保护配置综述 .66配电线路各保护综述 .67总结 .68致谢 .