李雅庄35kV变电站微机保护系统设计与实施

发布时间：2018-01-24 08:15

本文关键词： 变电站微机保护系统差动保护二次谐波制动　出处：《太原科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：微机保护系统是现代化变电站二次系统的重要组成部分，是变电站实现综合自动化的前提。35kV电压等级的煤矿变电站，是煤矿供电的主力，在煤矿电网中占据重要地位，并且煤矿是一级负荷，其供电的可靠性对安全生产至关重要。随着大批煤矿旧站的升级改造和新站的投入运行，微机保护系统在35kV煤矿变电站中被广泛应用，因此加强微机保护系统在煤矿变电站中的应用研究，对于煤矿供电系统的安全、可靠、经济运行等方面有重要的理论和实践意义。本文结合李雅庄新建35kV变电站工程，对其微机继电保护系统和变电站综合自动化系统进行了研究、设计与实施。首先，根据李雅庄35kV旧站运行现状，结合未来发展的需求，制定了相应的新站升级方案，并对变电站综合自动化系统进行了设计与选型。其次，对李雅庄变电站继电保护需求进行了详细研究与分析。在此基础上，，确定了变压器、线路、电容器等主设备的保护功能，并选择了相应的微机保护装置。同时，对李雅庄变电站的施工环境、干扰源以及可能引起微机保护装置误动作的因素进行了研究与分析，设计了相应的施工方案。最后，在分析差动保护二次谐波制动原理及判据基础上，通过变压器空投试验来检验二次谐波制动系数选取的合理性，保证了变压器差动保护的可靠性。李雅庄35kV变电站已投入运行。结果表明，系统运行稳定，微机保护系统动作正确，变电站综合自动化系统响应时间、信息刷新速率等各类指标均达到了预期的设计要求。
[Abstract]:Microcomputer protection system is an important part of the secondary system of modern substation. It is the premise of comprehensive automation of substation. 35 kV voltage grade coal mine substation is the main force of coal mine power supply. It occupies an important position in the coal mine power network, and the coal mine is a first class load, the reliability of its power supply is very important to the safety production. With the upgrading of a large number of old coal mine stations and the operation of new stations. The microcomputer protection system is widely used in 35kV coal mine substation, so strengthening the application research of the microcomputer protection system in the coal mine substation is safe and reliable for the coal mine power supply system. Economic operation and other aspects have important theoretical and practical significance. In this paper, the microcomputer relay protection system and the substation integrated automation system are studied, designed and implemented in connection with the new 35kV substation project in Liyazhuang. According to the current operation situation of the 35 kV old station in Liyazhuang, combined with the demand of the future development, the upgrading scheme of the new station is formulated, and the integrated automation system of the substation is designed and selected. Secondly. The requirement of relay protection in Liyazhuang substation is studied and analyzed in detail. On this basis, the protection functions of main equipment such as transformer, line and capacitor are determined, and the corresponding microcomputer protection device is selected. The construction environment of Liyazhuang substation, the interference source and the factors that may cause the misoperation of the microcomputer protection device are studied and analyzed, and the corresponding construction scheme is designed. Based on the analysis of the second harmonic braking principle and criterion of differential protection, the rationality of selecting secondary harmonic braking coefficient is tested by air drop test of transformer, which ensures the reliability of transformer differential protection. Liyazhuang 35kV substation has been put into operation. The results show that the system is stable, the operation of microcomputer protection system is correct, and the response time of substation integrated automation system is correct. Information refresh rate and other indicators are up to the expected design requirements.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM63;TM774

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