Real-Time Monitoring System Of Power Network Equipment Based On MSP430

Among all kinds of the high-voltage power grid equipment faults, heat, leakage current aretwo main causes of power cut. Therefore, online temperature monitoring and leakage currentmonitoring of the high-voltage power grid equipment have become two urgent problems to besolved. In order to solve these problems, this paper develops a monitoring system. Combinedwith present rapid development of Wireless Sensing Technology, computer software andhardware technology, automatic control technology and communications technology, an on-linemonitoring system for high-voltage power grid equipment temperature, leakage current, isdeveloped.Firstly this paper makes a technical analysis of present research on power grid equipmentmonitoring and on-line temperature monitoring technology and electrical equipment on-linetemperature monitoring technology.Furthermore, the paper focuses on several aspects: mechanism of contamination flashover,the relation between the process of flashover and the leakage current and dynamic model of arcdischarge in insulator, and analyzes insulator flashover process with the relationship of leakagecurrent, the paper also analyzed the insulator. A simulation program, based on MATLAB, of arcdischarge insulator, is made to imitate the changes of the leakage current when the voltage orsurface conductivity of insulator changes.Then, in chapter three monitoring system for power grid equipment leakage current andtemperature is designed. Hardware design of the system includes two parts: one is the datacollection of leakage current; the other is the data collection of temperature. In the hardwarecircuit of leakage current acquisition, a suitable leakage current sensor, programmable amplifiersand A/D converters are adopted and signal filter circuit is designed. In the temperatureacquisition hardware circuit, the system is composed of PC as host computer and low-power-lossMSP430 microcontroller as the sub computers; temperature of power grid equipment is acquiredby sensor DS18B20 controlled by MSP430. Then MSP430 the wireless transmitter module STR-30 will send temperature data to the wireless receiver module STR-30 of PC. Finally, the softwaredesign of data collection modules, data transmission modules and reception modules software arecompleted and the programs are compiledAfter that description of the details of the serial communication methods, including theserial communication design and implementation, transmission subsystem design and MSCommintroduction, the realization of serial communication are made.Finally, in chapter five the PC software designs including hardware platforms, the realizationof databases and the functional modules, are presented. In hardware designs a new chip MSP430 is used. Experimental results show that on-line monitoring of the temperature and the leakagecurrent, data display, data query, curve graphic display, print, warning, and other functions arerealized in this system. And this system has better scalability and is easy to maintained, thereforeit can realize stable, reliable operation. This system has the advantages of safety, reliability,simple structure, low cost, easy installation and low power consumption.