Over-voltage Analysis Based On Virtual Instrument

This paper is takes those dates which be got from field engineering as the research object. The analysis system of over-voltage dates from electric power system based on virtual instrument technology are researched and developed also. To begin with ,this paper deal with the importance of over-voltage analysis system in electric power system. The existing research status in the world, the developing trends and the application prospects for over-voltage analysis are introduced in details. LabVIEW programming language which is used in the paper is simply introduced. LabVIEW is a programming language of Graphics and adopt data stream programming thinking. Traditional programming is instead of icon and link, So the time of system developing is cut down. Accordingly, the author formulates all type of over-voltage and their waveform features after normal insulation cooperation, including arguments and time of duration, etc; introduces conventional method of insulation cooperation to afford a theoretical base of following over-voltage analysis. The author prefers "TR2000-B Transient Over-voltage Monitoring and Recording System" developed by Sichuan Power Trial Institute, to obtain analysis data. The author develop a program to analyze this data by LabVIEW .The program can give enough analyses function, namely Time domain analysis and frequency domain analysis. At the over of the part, the author quotes some classical and frequent over-voltage waveforms and analysis them. By analysis some classical and frequent over-voltage waveforms, the type and reason of over-voltage can be obtained. The result of over-voltage analysis can have an important influence on the researching and deciding insulate intensity of electric installation ,repair cycle ,equipment improved, over-voltage's effect on power system and preventing of over-voltage.At the end of the paper, the author also gives statistic analysis of over-voltage data which be got from substation during period of time. In statistic analysis of over-voltage data, those data can be calculated by using LabVIEW and theory of statistics to get distributed function of those data. In this paper two assumptions are adopted: normal distribution and maximum distribution. In the end, phase-grounding over-voltage can appreciatively be considered as normal distribution. The result of statistic analysis can supply important miasmatic model for insulation coordination. At last, the summarization to this paper study is received and the prospects of the over-voltage analysis are discussed.