Based On The ARM Coal Mine Substation Monitoring System

With the national economy and the rapid development of modern science and technology, electric power is becoming more and more important in industrial production and daily life. Requirements about the reliability and security of the power system are increasing. Management and traditional artificial electromagnetic surveillance device substations is needed of rehabilitation. Monitoring system of substation towards digital, network-oriented development is the trend. So, this paper presents the ARM2440A processor and Ethernet-based substation control system design.The operation of the new substation control center staff only through the monitoring software changes can be achieved for all of the equipment to monitor substations. Remote monitoring software also supports remote access it, you can connect to the Internet to achieve the remote monitoring. The new substation monitoring unit with high-performance 32-bit ARM9 family S3C2440A processor and real-time operating systemμC/OS-Ⅱ, makes the monitoring unit with superior performance. Substation analog current and voltage signals using a new type of Hall sensor acquisition, to overcome the electromagnetic sensor is only suitable for 50Hz measurement shortcomings. ALF low-pass filter circuit is used to filter out high frequency harmonics, preventing the occurrence of aliasing effects. Analog signal after conditioning is putted into the A/D converter carried by the CPU for analog-digital conversion. According to the nature and function of each task is different, they are given different interrupt priority and task priority to ensure that the system has good real-time performance. he LwIP agreement is transplanted into theμC/OS-Ⅱ, the communication of monitoring unit and the monitoring center lines with Ethernet TCP/ IP protocols, communication speeds up to lOMbps. meet fully the requirements of power system "4ms" real-time requirements.The system uses VB6.0 language to develop upper machine monitoring software, by calling the Winsock to achieve the monitoring software for network communications. Monitoring software can be on multiple devices at the same time remote monitoring and control, interface design, user-friendly, simple, easy to operate, with real-time data demonstrated that the system parameter settings, curve display and report printing System uses SQL Server databases, information storage volume, can be the manner authorized by office automation system to allow access to the database to achieve information sharing.As the number of coal mine electrical equipment within a substation, this paper in order to achieve the main transformer substations within the 35KV/6KV remote monitoring, for example, discusses in detail the entire monitoring system development process.