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LiFePO4 battery has been widely used in electric vehicles due to high safety and long cycle life. This paper firstly analyses the basic characteristics of LiFePO4 battery including the capacity and internal resistance. Secondly, particle filter (PF) algorithm is introduced to predict the remaining useful life (RUL) of LiFePO4 battery effectively. Based on the LiFePO4 battery life degradation data,...
The statistical characteristics of the impulse breakdown time lag in transformer oil are studied over a wide range of pulse width, and the statistical discharge time lag and the discharge formation time lag are calculated by the Laue's pattern. Then a physical model for the discharge initiation process in quasi-uniform field is built. It is supposed that the field emission current generated by the...
The bubble mechanism based on field emission has long been considered to be responsible for breakdown in liquids under impulses with durations of microseconds. Hence, it is quite reasonable to associate the insulation failure with electrode materials. In this paper, the 50% impulse breakdown voltages and the discharge time delay with different metal electrode materials were acquired through experiments,...
The electrical behavior of transformer oil subjected to high electric-field and the possible breakdown phenomena is of great practical interest, since this dielectric liquid has been widely used in high-voltage power apparatus and pulse power systems. Compared with the discharge mechanisms and behaviors derived from various gas atmosphere, the initiation and evolution are more complicated, and the...
The oil-paper insulation has been widely used in large power equipment, and thermal and electrical stresses are the two main origins causing the deterioration and failure of oilpaper insulation system. In this paper, accelerated aging experiments of oil impregnated paper are conducted and partial discharge (PD) measurement are performed under typical defect models, i.e. protrusion, surface discharge...
Polymeric materials such as polypropylene films are widely used in electrical and electronic devices because of their good mechanical, chemical, and electrical insulation properties. The electrical behavior subjected to high electric-field and possible breakdown phenomena are of great practical interest. For high-voltage electrical equipment, insulation defects such as pointed end are unavoidable...
The electrical behavior of dielectric liquids such as transformer oil subjected to high electric-field and the possible breakdown phenomena is of great practical interest, since this liquid has been widely used in high-voltage power apparatus and pulse power systems, accordingly has led to extensive research work. This paper presents streamer discharge process such as initiation and propagation until...
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