直流牵引供电系统的微机保护测控探讨

随着我国经济的高速发展，地铁成为解决大中城市交通拥挤问题的最佳方案，然而国内对地铁直流牵引系统的微机保护研究尚属空白，作者探讨了用于直流牵引供电系统的微机保护测控装置及原理，针对地铁直流牵引系统的运行特点，以西门子公司产品DPU96为例，介绍了地铁直流保护的硬件配置，保护原理，测控以及通信接口，详细分析了最大电流Imax、电流步进变化值ΔI，电流变化率di/dt，定时限过流DMT等等直流保护的基本原理，介绍了Profibus通信技术在直流数字保护测控装置和变电站自动化中的应用，该直流微机保护装置即将在广州地铁二号线投入运行。

DISCUSSION ON MEASUREMENT AND CONTROL OF COMPUTER BASED PROTECTIVE RELAYING FOR DC TRACTION POWER SUPPLY SYSTEMS

Along with the high-speed development of national economy, Metro becomes the best solution to overcome the traffic jam in big or middle cities in China. However, up to now the domestic research on the computer based protective relaying for DC traction supply system of Metro has not been carried out. In this paper the principle of the computer based protective relaying for Metro is discussed. According to the features of operation of DC traction supply system of Metro, the hardware configuration, protection principle, interfaces for measuring and controlling in a Siemens product DPU96, which is taken for example in this paper and will be soon put into operation in the 2nd line of Guangzhou Metro, are described. The maximum current Imax, current step-change DI, current slope-change dI/dt and definite-time overcurrent DMT, etc., are analyzed in detail. The applications of Profibus telecommunication technique in DC digital protection unit and substation automation are introduced.