保护接地系统漏电保护装置研究

The Study of Leakage Protection Device of TT System

文章介绍各低压供电系统及其漏电电流的特征,并分析漏电保护装置在各系统中的应用差异,设计了一种针对保护接地系统(TT)的基于单片机的漏电保护装置。该装置具有判断漏电电流幅值与相位大小、线路温度测量、火灾预防与消防联动并根据反馈信号对故障电路作出处理等功能。该装置能够对故障相进行快速分析,根据信息融合技术作出相应处理措施,实现漏电保护装置的智能化。应用Matlab,Protues软件对TT系统发生单相、二相漏电故障电流波形特性进行仿真和单片机进行运算仿真,仿真结果表明此设计达到设计要求。

This paper introduces the characteristics of leakage current and leakage protection device used in low - voltage power supply system. It also analyzes the difference of leakage protection in different system. Thus, a leakage protection device was designed based on MCU for TT system. The device is characterized with functions of judging the amplitude and phase of leakage current, line temperature measurement, fire detection and fire interaction and treating the faulty circuit according to feedback. The device can quickly analyze the faulty phase, make appropri- ate treatment based on information fusion technology to achieve intelligent leakage protection device. Matlab and Prorues software are used to simulate single - phase, two - phase characteristics of leakage current waveform of tit system and the microcontroller operation. The results show that the design meets with the design requirements.