The Study On The Intelligent Residual Current Operated Protective Device

Eletricity, which is fast related with the agriculture, industry, is most important for today's economy, it is convenient for transfer and use, and it is the most clean energy source. Accompany with the economy's increase, the use of eletricity is growing quickly, and the safety is becoming more and more important. The residual current protect of the low-pressure eletricity net has been highly regarded by the electric department, a scientific and full-classed residual protect system is highly recommended. The use of residual current operated protective device can avoid the economy loss of the fire and people's death due to the electric shock, so it is extensive used.At present, residual current operated method is mainly used in or out of our country. But in some cases, this method can lead to reject or mistake-operated, so the safety is in problem. Those problems have not been solved, new protect methods are needed to meet the different requirement in different circumstance.Furthermore, all kinds of electric residual current operated device have been using the traditional analog integrated circuit to achieve the single protect function. The use of single-chip microcontroller can improve the system's reliability, make the residual current operated device more functional.This paper focus on the residual current operated protect method, based on the study of the AC or DC current transformer, through the theory analysis of the different residual current, realize the detecting, Real-time discharging and displaying by applying single-chip microcontroller technology. And in final, intelligent residual current operated device with high reliability is completed.