三相异步电动机断相保护毕业.docVIP

三相异步电动机断相保护 (陇东学院 电气工程学院 甘肃 庆阳 74500) 摘 要：以单片机C8051F020及其外围器件作为硬件平台，对电动机微机保护进行了研究，主要针对大中型电动机的智能电动机保护器，具有过流保护、零序电流保护、负序电流保护、启动时间过长保护、欠电压保护、过电压保护等功能。 在电动机保护器的过程中，对电动机的各种故障进行了全面的论述。并根据需要确定了保护方案，论述了保护原理。 在硬件电路设计上，给出了以单片机C8051F020及其简单的外围电路为主体配置的电动机保护器系统。该电路硬件电路大为简化，除了实现了各种保护功能外，还可显示电动机运行时的电压、电流，同时设置了系统与上位机的连接,为系统功能的扩展创造了条件。作为一种智能化的解决方案，该系统具有可实现功能多，经济成本低，高的可靠性和稳定性等特点。 关键词： 三相异步电动机：C8051F020 断相保护 电动机故障 Three-phase Asynchronous Moto Phase Failure Protection (Longdong University School of Electrical Engineering, Qingyang 74500) Abstract: MCU C8051F020 and its peripheral devices as the hardware platform, the motor microcomputer protection, mainly for large and medium-sized motor Intelligent Motor Protector with overcurrent protection and zero-sequence current protection, negative sequence current protection, start-up time is too long to protectunder-voltage protection, over voltage protection function. ?????In motor protection process, comprehensive exposition of the various failures of the motor. And in accordance with the need to determine the protection program, discusses the principle of protection. Hardware circuit design, given the configuration of the motor as the main MCU C8051F020 its simple peripheral circuit protection system. The circuit hardware circuit is very simple, in addition to various protection functions, can also display the voltage, current, when the motor is running and set up the connection of the system with the host computer at the same time, create the conditions for the expansion of the system functionality. As an intelligent solution, the system having a multi-function, and low economic cost, high reliability and stability, and other characteristics can be realized. Keywords: three-phase asynchronous motors: C8051F020-off phase motor protection fault 1引 言 1.2国内外的发展状况和动向 电动机保护系统大致可划分为三代。 第一代是电磁式继电保护系统，第二代是电子式电动机综合保护装置，第三代是以微处理器为核心元件的综合保护系统。 第一代的电磁式继电保护系统存在着很大的弊病。它的每一种功能都需要相应的继电器来实现。在正常情况下，热继电器每年需要校正一两次，给用户带来不便。由于热继电器是由双金属片构成其敏感元件，它是靠双金属片受热