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随着社会的发展，机械生产规模的扩大，电动机的应用越来越多，但电动机发生故障时，除电动机本身烧毁外，还经常波及生产系统，且其本身价格相应较高。因此，对电动机实行有效保护是保证生产系统正常工作的一项重要任务。高压电动机的微机继电保护与常规保护相比，具有快速、准确、可靠、故障率低、维护方便等特点。
本文深入研究了以单片机为核心的高压电动机过负荷保护系统，主要内容如下：
1.介绍了高压电动机过负荷保护系统的国内外现状和发展趋势。
2.深入系统地分析了高压电动机过负荷保护控制电路的电气特征及其保护原理。
3.设计了高压电动机过负荷保护系统的总体方案和控制电路图，并绘制了监控程序流程图。
关键词：高压电动机； 过负荷； 单片机

Along with society's development, expansion of the machinery scale of production, electric motor's application are more popular, but when the electric motor breaks down, except burning itself, but also affects the production system frequently, and the price is correspondingly high. Therefore, implements effective protection to the electric motor is an important task of guarantee the normal work. Compared to normal protection high-tension motor's microcomputer is fast, accurate, reliable, has low failure rate and convenient maintenance.
The article deeply research high-tension motor load protective system with the monolithic integrated circuit as the core, the primary coverage has been as follows:
1. briefed the high-tension motor load protective system's domestic and foreign present situations and the trend of development.
2. analyzed the high-tension motor load protection control circuit's electrical characteristic and the protection principle systematically thoroughly.
3. designed the high-tension motor load protective system's overall concept and the control circuit diagram, and has drawn up the monitor routine flow chart.

key word: High-tension motor; Crosses the load; Monolithic integrated circuit