本科学位论文-矿用变压器的保护设计.doc

矿用变压器的保护设计 摘要 随着我国电力工业的迅速发展，在现代电力系统中，变压器保护装置能否准确、及时、可靠的动作是保证电网安全运行的关键因素之一。目前，对变压器保护装置的实时性、计算精度和大量数据运算速度的要求不断提高，单片机系统在很多场合下已经不能很好的满足用户要求。而DSP系统由于运算速度快、精度高等特点，正逐渐取代单片机系统。 DSP拥有快速的指令周期以及地址、数据总线分离等适合快速数字信号处理的优点。除此之外，它有着丰富的硬件资源，强大的功能，先进的开发环境及开发平台，能够极大地提高保护产品的性能。文章以MOTOROLA公司的DSP2407芯片为核心，提出了集测量、保护、控制、通信等功能于一体的变压器后备保护装置设计方案。 论文主要研究了微机保护的可靠性、微机保护算法以及变压器后备保护装置的设计。文章在微机保护可靠性方面进行了较为深入的理论分析与计算，构造了状态空间模型，为带自检的变压器保护装置的可靠性作出了估算。给出了提高变压器保护装置可靠性的措施，并将部分措施应用于装置设计中，取得了预想的效果。另外，文章也对几种典型的微机保护算法进行了详细的理论分析。最后，在了解变压器保护装置的结构和功能的基础上，文章提出了变压器保护装置的设计方案，介绍了部分硬、软件的设计。 关键词　变压器保护；微机保护；保护回路 DESIGN OF PROTECTION OF MINING TRANSFORMER ABSTRCT With the rapid development of power industrial in our country,the protection device for transformer whether can exactly, timely, reliably act, which is one of animportant factor for power grid to guarantee running securely in modern electricsystem. Now, the real time, precision of calculation and the velocity of runningdatum are required to improve on backup protection device for transformer.Single-chip system cant satisfy users requirements in many situations. However,DSP system will gradually substitute single-chip system because of its advantages,such as the velocity of running and high precision DSP owns rapid instruction periods,address buses separated from data buses,which can excellently adapt to the rapid digital signal process. Besides, it has abundance of hardware resources, strong instructions, excellence developing circumstance and corresponding with developing platform, which greatly improve performance of protection products. Based on the DSP2407 chip of MOTOROLA Company, this paper proposes a designing scheme of backup protection device for transformer,which includes measuring,protection and communication etc The reliability of microcomputer protection,protection algorithm of microcomputer and designing of device are studied in this paper. Firstly, the reliability of microcomputer protection is analyzed and calculated acc