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This paper has summarized the history of the development of the state monitoring system of the power transformer and introduced the present situation in research, especially the multifold comparison on different methods to diagnose the trouble in transformer. This paper not only takes the comprehensive analysis on the extant online monitoring equipments, which is based on DGA, and methods of trouble...
Based on the dissolved gases analysis and grey relational theory, a fault diagnosis method for transformers is proposed. Fault diagnosis in transformers has several parameters such as the severity of fault and the kind of fault, a lot of typical fault samples are divided into several sets according to the fault type. The practical data are analyzed using grey relational analysis. The experiment showed...
The mechanism of oil flow electrification in transformers was described in this paper. The mechanism of oil flow electrification in transformers could be understood from the effect of the oil flow's movement and the electromotive action of AC electric field. The electric polarity of oil flow and the insulating layer were mainly depended on the state of charged cations and anions in oil, while the...
Virtual Reality technology is new technology developed in recent years. Transformer overhaul of virtual reality simulation system is an important area of technology. In this paper, based on virtual reality simulation system for transformer overhaul and development process, this system development and design concept can also be applied to the circuit breaker, isolator and other electrical equipment.
Direct current through directly-grounded neutrals of nearby AC transformers may induce DC biases of transformers when high voltage direct current transmission (HVDC) system operates on ground return mode, thus producing negative impact on the AC system. This paper introduced the influence of DC bias to transformer and its research efforts. The suppression measures of DC bias were analyzed .
The operating experience of transformer in recent years show that oil-flow electrification have proved to be one of the crucial factors which impact the safe operation of large transformers. For the manufacturing process of extra high voltage transformer become more rigorous than the usual one, relatively, the operating conditions are more severe than before, therefore, effective measures should be...
As the power transformer has been to the direction of high voltage and large capacity. Therefore, the calculation of major insulation and longitudinal insulation has been played a more and more important role in transformer design. Use the simplified equivalent circuit as the calculated model. The calculation software for wave process of power transformer winding is developed with Matlab language...
Transformers are set underground and embedded in pit for a long time, so heat problem is very prominent. In this paper, the DGSR11-H-315/10 transformer was directly buried in pit, heat transfer models of embedding system (including embedding transformer, pit flow and soil medium) were established, and the numerical simulation was conducted for temperature and flow-field distribution. Comparison of...
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