由于煤矿井下工作环境恶劣：空气潮湿，含有瓦斯、煤尘等易燃易爆气体，对于供电系统的短路、漏电等故障，如果没有及时采取应对措施，很容易引发触电甚至爆炸，这将严重威胁到工作人员的人身安全。馈电保护系统针对这些易发事故的电气故障特征，通过采集电网的电量信息判断事故类型，并在发生故障后能够可靠切断线路，从而避免不必要的损失。随着科技的发展，井下作业对馈电保护系统提出了更高的要求。本论文根据现有馈电保护装置所存在的信号采集不精确、误动、拒动等问题，设计了一种新型馈电保护系统，该系统综合多种保护于一体，具有故障记录、查询、远程监控等功能，而且触摸屏界面使操作更加方便。 论文首先介绍了馈电保护系统的发展历程，根据现有馈电保护装置的缺点和不足，提出了设计新型馈电保护系统的必要性。然后分析了矿井常见故障的电气特征，根据不同类型故障的特点，制定了相应的保护原理。系统具备短路、缺相、不平衡故障、过载、过压、欠压、瓦斯、风电、绝缘检测和选择性漏电保护等功能，为之后的硬件电路设计以及软件设计提供了理论依据。最后对保护系统分模块进行测试并进行整机调试。实验结果表明所设计的保护系统能够达到预期效果。 在本系统设计过程中，信号采集部分将幅值检测和相位检测分开进行。幅值检测的对象主要包括三相电流、系统线电压、绝缘电阻、零序电压和零序电流等。相位检测包括两个方面：一方面是三相电流和系统线电压的相位检测，采样值主要用于功率因数以及功率的计算；另一方面是零序电压和零序电流的相位检测，采样值主要用于选择性漏电保护的判断。此外根据电流故障的特点，设置了自动量程切换功能，用以检测小电流信号。人机界面采用迪文科技的DGUS触摸屏，用于参数设置，状态显示，故障诊断、记录以及故障查询。

Mine's working environment is very poor, containing humid air, inflammable and explosive gas, such as methane and coal dust etc.. For short circuit, leakage and other faults in power supply system, if there is no timely response measures, it is easy to cause shock or even explosion, which will seriously threaten the personal safety of staff. In view of the characteristics of these prone accident electrical faults, feeder protection system can determine the accident’s type through gathering electrical power information and can reliably cut off the line after a failure, so as to avoid unnecessary losses. With the development of science and technology, the downhole operation put forward higher requirements for the feeder protection system. According to the signal acquisition of inaccurate and false operation, rejection and other issues in the existing feeder protection devices, this paper designed a new type of feeder protection system, which integrates various protection, having fault record, query, remote monitoring function, and its touch screen interface makes operation more convenient. Firstly, the paper introduces the development course of the feeder protection system. According to the shortcomings and deficiencies of the existing feeder protection device, it puts forward the necessity of designing a new type system. Then analyzing the electrical characteristics of the common fault in mine, and formulating the corresponding protection principle for different faults. The system has the functions of short circuit, phase failure, unbalanced fault, overload, over voltage, under voltage, gas, wind power, insulation detection and selective leakage protection. It provides a theoretical basis for the hardware circuit design and software design. At last, the system is tested and debugged by the module of protection system. The experimental results show that the designed protection system can achieve the desired results. In the design of the system, the signal acquisition part is divided into amplitude detection and phase detection. The object of amplitude detection mainly includes three phase current, line voltage, insulation resistance, zero sequence voltage and zero sequence current. Phase detection includes two aspects: on the one hand is the phase detection of three-phase current and system line voltage, sampling value is mainly used for the calculation of power factor and power; on the other hand is the phase detection of zero sequence voltage and zero sequence current, sampling value is mainly used for the judgment of the selective leakage protection. In addition, according to the characteristics of current fault, the automatic range switching function is provided to detect small current signal. Man-machine interface adopts DGUS touch screen produced by DWIN technology, used for parameter setting, state display, fault diagnosis, recording and fault inquiries.