【作者】 徐长宝；

【导师】 黄天戍；

【作者基本信息】 武汉大学 ， 检测技术及自动化装置， 2004， 硕士

【摘要】 随着电力工业的迅速发展，大型变压器得到了广泛的应用。大型变压器一旦发生故障，影响范围很大。因此大型变压器的继电保护十分重要。 差动保护是变压器的主保护。如何提高大型变压器差动保护的灵敏性和可靠性，是倍受关注和十分重要的领域。 本文旨在讨论现代大型变压器的主保护装置的设计。 文中系统的介绍了变压器保护装置的历史发展及其现状；具体分析励磁涌流产生的原因及常规的辨别励磁涌流的方法；采用11状态卡尔曼滤波算法作为提取基波及高次谐波的方法；分析、比较傅氏算法、卡尔曼滤波算法等算法在信号处理中的优劣；构建主保护装置的硬件电路。 文中对变压器保护中遇到的和应涌流现象提出思考，以期能够引起同行的注意，找到一个合适的解决方案。更多还原

【Abstract】 With the development of electrical industry, more large power transformers will be widely used in power system. As the failure of them damages the power system normal operation seriously, the protection performance for the large power transformer must be improved.Differential relay is the key protection for power transformer. It is notable to improve the sensitivity and reliability of differential relay.The purpose of this paper is a discussion about how to design a sensitive protection device.The paper systematically discussed the developments and present situation of transformer protection. The paper has introduced and analyzed the principles of discriminating the magnetizing inrush and fault current, which had been developed in resent decades. A set of eleven-state Kalman filters is used to estimate the fundamental and up to fifth harmonic components of the transformer current signals. Here the calculation method for signals including aperiodic component based on the algorithms such as the Fourier algorithm and Kalman filter algorithm and so on are given. The paper presents the design and real-time implementation of a Kalman filter based digital percentage differential and ground fault protection scheme for three phase power transformers. The paper introduced the partly hardware used in the device.The paper also points out another question of surge inrush.更多还原