Study on the Gas Diffusion Pattern of Oil-impregnated Paper Bushing Under Typical Fault

The oil impregnated paper bushing (OIP) technology is mature, with low technical difficulty and cost. However, due to its oil paper insulation structure, when internal discharge faults occur, characteristic gases such as H<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> may be generated, leading to a sharp increase in the internal pressure of the bushing and causing the bushing to explode, potentially resulting in transformer explosion and combustion in severe cases. Therefore, this paper constructs a simulation model of OIP to obtain the diffusion characteristics of H<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> gas inside the OIP under the condition of constant release rate. Additionally, the insulation discharge faults of OIP are analyzed and simulated, and a test platform is established to measure the changes in the content of dissolved gases in the oil during the fault period. The overall trend of the characteristic gas content during the fault process is first sharply increasing and then gradually tending to equilibrium, verifying the accuracy of the simulation results. This provides new possibilities for establishing fault prediction and diagnostic models, which in turn contributes to improving the maintenance efficiency and reducing maintenance costs of transformer OIP.