基于MSP430的综合选线保护系统的开发与研究

Researching and developing of synthetic criterion selection protection system based on MSP430

论文在对零序暂态能量、零序有功功率、零序直流选择性等漏电保护原理进行分析的基础上,进一步深入研究了零序直流选择性漏电保护原理,提出了对传统零序直流选择性漏电保护原理的改进方案,并提出了一种将三者相结合的漏电综合选线保护方案。设计出了一种漏电综合选线保护装置,并设计了软件程序。系统的硬件设计采用了模块化的设计思想,主要包括数据采集单元、处理单元等。通过软件的设置来实现多路交流信号的软件同步采样。系统的软件设计也采用了模块化设计思想。

In this paper, based on the analyzing of zero sequence transient energy, zero sequence active power, zero sequence DC current creepage protection system principle, and further studying of the selective leakage protection principle of zero sequence DC current, an improved schemes for the selective leakage protection principle of zero sequence DC current is proposed, and a creepage synthetic protection scheme which combined these three principles is presented. Also a creepage synthetical line selection protection equipment and its software were designed. Finally, it can achieve the goal to monitor the insulation resistance of power network, and to improve the accuracy of selecting faulted line. Blocking method was adopted in designing of the system hardware, which consists of data acquisition unit, processing unit and so on. Software synchronous sampling of multi-route alternating current signals was realized by software settings. Blocking method employing FFT was also adopted in designing of the system software, which includes system initializing, software of line selective principle, interface of LCD, and the high level computer communication and so on.