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《Electric Power Automation Equipment》 2006-06
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On-line monitoring and diagnosis of power transformer based on dissolved gas analysis

XIAO Yan-cai1,ZHU Heng-jun1,ZHANG Xiao-yuan2,CHEN Xiu-hai3(1. Beijing Jiaotong University,Beijing 100044,China; 2. Xuji Electric Group of Beijing,Beijing 100085,China;3. Beijing Electric Power Corporation,Beijing 100031,China)  
The DGA(Dissolved Gas Analysis) is essential for the insulation state assessment and the fault diagnosis of transformers. The principle of the DGA - based on - line monitoring and diagnosis system for transformers is first introduced in which its present research status and problems are summarized. The on - line system mainly monitors gases in oil and alarms when exceeding. It acquires poor or even no information about the fault character,the type,the location and the development trend,the system depends on the off - line analysis for diagnosis. Rules for on - line data in the normal operation is still fuzzy so far due to lacking of associated theories, and the precision of the equipment itself can not be ensured. Prospects are finally presented,in which how to find out a fundamental theory for the transformer diagnosis through the on - line data mining is the core.
【CateGory Index】: TM406
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