在矿井低压供电系统中，馈电开关是保证系统安全运行的重要电气设备之一。随着矿井生产自动化水平的日益提高，对矿井低压电网的供电连续性、安全性及可靠性要求越来越高，也对电气设备保护装置的检测与保护提出更高的要求。本课题是研究一种以DSP(TMS320F2812)为主控CPU，单片机为辅助CPU的集多种保护、测控、通信功能于一体的矿用智能综合保护装置。 系统测控部分对电压、电流信号进行采集与转换，利用快速傅立叶算法，计算出系统电压、电流、功率等电参量。并以此为依据，配合井下电网出现故障时的特征，对短路、漏电及过负荷等故障实现保护。其中利用相敏保护有效的区分出三相短路和电机启动运行状态，以及通过负序电流的检测实现两相短路和断相故障的保护，漏电保护采用基于附加直流电源检测和零序电流方向检测相结合的保护判据，实现对井下低压电网漏电时的横向选择性和纵向选择性保护。由DSP所测的电参量经双口RAM传递给单片机管理模块，完成人机对话任务，通过多级菜单的切换实现整定值修改、系统参数和开关状态的在线显示等，实现人机交互。最后运用CAN通信技术与上位机进行实时通信。 硬件设计对主要电路和器件功能进行分析，充分利用DSP外设口多且功能复用的特点，简化系统硬件结构。软件设计采用基于事件触发的多任务模拟系统编程思想，在程序架构上采用多任务设计及基于事件驱动的处理方式；在程序实现上则采用前后台系统，这样可以综合RTOS和前后台系统的优点，获得资源与性能的平衡。 本文最后对装置的试验情况进行了介绍，对相关数据作出分析，并对研究工作做了总结，提出了今后的工作方向。

In the low-voltage power supply system in mine, feeding switch is one of the important electrical equipment to ensure the safe operation of the system .With the development of the automation of mine production, low-voltage power supply on mine continuity, security and reliability have become increasingly demanding, so do the detection and the protection of the feeding switch of the power supply device. The topic is focused on an intelligent comprehensive protection device for mine, which is a combination of a variety of protection, measurement and control and communication function, with a DSP(TMS320F2812)as the controller CPU and microcomputer as the auxiliary CPU. The measurement and control system acquits and converts the voltage and current signal and works out the power electric parameters, such as the system voltage, current, frequency and rate of work, via the fast Fourier algorithm. Based on it, and cooperated which the features of the malfunctioning of the underground power grid, the protection is realized for the fault, such as the short circuit, leakage and over-load, .ect, .Then, the transverse and longitudinal selective protection of low-voltage power gridcan be realized according to the leakage protection based on the combination of additional dc power diction and zero current direction diction, which is realized by the distinguishment of the three-phase short circuit and motor start running condition according to the phase sensitive protection, the protection of the two-phase short circuit and the broken phase fault though the detection of the negative current.The electric parameters, measured by DSP, is transferred to the microcontroller management module through the double mouth RAM, to complete the man-machine dialogue task and realize the modification of the whole set values and the online shows of the electric parameters and the switch quantity . Finally, live communication is realized by eCAN communication technology and super ordination machine. The hardware design analyzes the main circuit and the functions of the devices to simplify the hardware structure, by making full use of features that there are large quantities of the DSP peripherals and the can be reused.The software design is based on events triggered multitasking simulation system programming ideas in program structure and the multitasking design and processing mode based on events-driven.The program realization adopts a front and back stage system to get the balance of the resources and function using the advantages of both of the RTOS and the front and back stage system. Finally, there is an introduction of the test of the device, an analysis of the relevant data, a summary of the research, and the direction of the future job.