The study on the state parameters of arc discharge bubble in transformer oil

Arc discharge in ultra-high voltage transformers leads to the rapid decomposition of transformer oil, causing a significant increase in tank pressure and potentially resulting in explosive accidents. The state parameters of the generated gases are crucial factors in determining the pressure generation mechanism within the oil. However, due to the high temperature, high pressure, and strong electric field near the arc region, there is a lack of effective experimental measurement methods, posing significant challenges to the study of gas generation state parameters. This paper establishes a method for calculating the state parameters of arc-induced gas generation. Through the observation of gas generation during arc discharge and the measurement of pressure within the oil, combined with theoretical calculations, key parameters such as gas pressure, internal energy, and arc energy conversion efficiency are obtained. The acquisition of discharge gas state parameters and energy conversion efficiency provides essential references for the development of pressure generation calculation models.