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The operational reliability of power transformers directly affects the stable and reliable power supply of the power system. According to the available data such as condition assessment, routine test results and maintenance records, a hierarchical architecture and information fusion technology based power transformers life estimation model is presented. Firstly, the model takes advantage of the fault...
This text put forward a kind of analytical method which analyzes the fault causes by layer upon layer based on the statistic, and identifies the safety risk of the insulators. This analytical method uses the way named FTA (Fault Tree Analysis) in reliability evaluation. Given that the fault probability caused by the strong storm is undefined, this paper regards the probability of the basic event as...
The paper put forward an optimizing calculation method to optimize the cable initial force of cable-stayed arch bridge while in arch rib cantilever erecting. The arch rib cantilever erection of cable-stayed arch bridge has the construction process of cable removal. It is different in cable-stayed bridge or arch bridge. Therefore common influence matrix cannot be used directly. And the optimizing method...
Based on the further analysis of typical failure modes and influences of tap-changers in power transformer, the fault-tree of tap-changers is set up by using fault-tree analysis(FTA) techniques and the assessment method for the reliability of tap-changers, combined with the index of the importance and the method of Improved Analytic Hierarchy Process(IAHP), is put forward. The assessment examples...
According to the analysis of existing technologies of on-line monitoring power cable insulation fault, aiming at that the temperature can better reflect the power cable insulation and the diversity of its monitoring methods, this paper mainly introduces the research situation and development trend of cable distributed temperature on-line monitoring technologies. Combined with application examples,...
Thermal modeling of the power transformer to estimate the internal temperature only reflects the winding hot spot to a certain extent. The application of optical fiber sensors to measure transformer internal temperature directly can obtain the true temperature with high accuracy and stability and overcome the shortcomings of traditional electric sensors. This paper analyses the measuring principle...
Transformer is the key equipment of transforming voltage and exchanging power in the power system. It's safe and reliable operation directly influences the safe level of the power system. The risk assessment of transformer is very significant to improve the reliability of the power system. A fuzzy comprehensive risk assessment model of transformer based on Borda number theory is proposed in this paper...
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