摘要
现代社会技术迅猛发展,常规综合自动化系统已经不能够满足人们对变电站的运行、管理要求。为了增强站内信息的共享性,提高设备之间的互操作性,实现设备的智能化操作等,人们提出了“数字化变电站”的概念。数字化变电站相比常规变电站,虽然在多个方面都具备优势,但其应用于实际工程的时间不长,从2006年才开始在我国发展,而数字化牵引变电所的工程案例更加少,其技术应用、工程经验等方面都比较缺乏,所以需要进行试验运行,来解决这些方面的问题。
由于以上原因,本文进行了数字化牵引变电所试运行方案的设计,具体内容包括：
1.对数字化牵引变电所进行了介绍,包括发展背景、技术原理、系统结构、设备特点,以及与常规牵引变电所相比的优势等,并着重总结了它所具备的各项关键技术及其特点。
2.通过分析、比较牵引变电所数字化系统关键技术的各种设计方法,包括电子式互感器、智能断路器、通信网络等,完成了数字化系统总体设计方案的讨论,并分析了利用冗余技术来提高系统可靠性的方法。
3.通过对一个实际的牵引变电所进行数字化改造,涉及包括断路器、隔离开关、保护设备、测控设备、通信网络等,建立了一套用于试运行的数字化牵引变电所方案,结合冗余技术与GO法,设计了系统的故障导向安全能力,并针对系统的网络通信、同步对时功能等,详细制定了二次设备接线方式。
4.结合数字化检测设备,以及实际测试经验,对试运行数字化牵引变电所详细地制定了功能试验项目,包括试验的内容、试验的方法、设备的要求、结果的性能指标等方面,并以差动速断保护、比率差动保护试验为例进行实例说明,从而完成对其主要功能的试验。
通过本文的研究,完成了对牵引变电所数字化系统设计方案的讨论,并通过对实际的牵引变电所改造,建立了试运行数字化牵引变电所方案,最后制定了功能试验项目,来检验系统主要功能的正确性,保证数字化牵引变电所能够正确运行。
As the rapid development of our technologies, the conventional comprehensive automatic system has not been able to meet the requirements of the substation management and operation. To enhance the information sharing, improve the interoperability of different devices and so on, people put forward the "digital substation" concept. Compared with conventional substation, digital substation has many advantages, but the time it applied in practice is not long, which began from September2006, and the time applied in traction substation cases are even shorter, the technologies and experience are lacked, so the commissioning is needed to solve these problems.
In order to verify the feasibility of digital traction substation, this paper has made the commissioning design, and it mainly includes these contents:
1. First, the digital traction substation is briefly introduced, including technical principles, system structure, equipment characteristics, and advantages compared with the conventional traction substation, and then, mainly summarize the key technologies of digital traction substation.
2. Second, through analysis and comparison, the design methods of the digital substation's key technologies are discussed, including electronic transformer, intelligent circuit breaker, communication network, etc, and the improve of the digital system's reliability is discussed by using redundancy.
3. Third, through remaking of a real traction substation, the commissioning digital system is established, and the system's "fault lead safety" ability is designed combining with redundancy and GO method, and the connection mode of secondary equipment is designed too, focusing on the communication network, and synchronization.
4. Finally, function tests for the designed system are formulated, including test contents, test methods, equipment requirements, performance index and so on, and the actual function tests are used as examples.
By the researches in this paper, the design of digital system is discussed, and a commissioning digital traction substation is established, and finally, the system function tests are made to detect the correctness of important functions, and to ensure the digital traction operating correctly.
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