低压馈电开关智能测控单元的设硬件设计.doc

低压馈电开关智能测控单元的设计-硬件设计摘 要 矿用低压馈电开关是煤矿井下配电系统的关键设备，其性能好坏直接影响着煤矿井下的生产安全和生产效率。其核心部件综合保护控制器，目前国内仍然以集成电路或模拟电路为主的微机保护为主，直接制约了开关性能的提高，因此开发全数字化的集测量、控制、保护、通信为一体的矿用低压馈电开关智能测控单元对提高低压供电水平具有重要意义。 在从理论上分析了低压馈电开关保护原理的基础上，本设计确定使用80C196KC 16位单片机，采用硬件软件化和全数字化采样设计思想，构造了矿用低压馈电开关智能测控单元的硬件电路，该硬件电路包括采集模块、最小系统、键盘显示模块、通信模块、控制模块等。该测控单元不仅具有漏电、电压、电流等综合保护功能、测量电量功能，还有液晶显示,RS485通信等功能。系统功能完善,人机界面良好,通信功能强大。并根据保护系统中主要干扰源的特征，对应不同的干扰信号制定了相应的硬件和软件抗干扰措施,提高了系统的可靠性。最后在低压馈电开关智能测控单元的保护原理和硬件电路的基础上，绘出了总体的软件流程图。 关键词：馈电开关； 测控系统； 配电 ABSTRACT The LV feeder switchgear used in mine is the key equipment of power supply system in mine, and its capability influences production safety and efficiency in mine. The core is the synthesis protective controller. At present, most of the component is occupied with microcomputer protection formed with integrate circuit or simulate circuit in our country, which restricts the improve of the switch capability directly. Therefore, developing a digital LV feeder switchgear used in mine which collects function of measure, control, protection and communication has an important significance. Based on the theoretical analyzing of protect principle of underground LV feeder switchgear, this thesis is decided to use the microcomputer 80C196, and adopt the designing idea that construct a hardware circuit of the LV feeder switchgear used in mine, which includes collecting module, mini-system, keyboard and display module, communicate module, control module etc. This measure and control system performs the functions which are not only voltage protection, current protection, earth leakage protection, but also liquid crystal display, RS-485 serial communication. The system has the perfect protective functions, favorable man-machine interface and powerful communication function. On the basis of analyzing the electrical characteristics of interference sources in underground, the corresponding hardware and software measures of anti-interference are taken to increase the reliability of the protective