Abstract: Power transformer is an important hub equipment in offshore platform, once the explosion occurs, it will seriously affect the normal production and operation of the platform, causing significant economic losses. Therefore, it is very important to ensure the transformer’s safe and reliable operation of the offshore platform. This paper takes the high voltage oil-immersed transformer of the first co construction offshore oil and gas platform in Asia as an example, FLACS software is used to model the platform in 3D, and the whole process of the primary explosion and secondary explosion is simulated. According to the calculation results, the maximum explosion over-pressure of the indoor room of the transformer is 0.073 MPa, and the maximum explosion over-pressure of the transformer door is 0.071 MPa, which may have some influence on the production facilities of the platform. In order to reduce the indoor explosion over-pressure, the paper optimizes the original design scheme by adding the explosion discharge area in the oil?immersed transformers rooms. According to the numerical simulation analysis, the explosion over-pressure is significantly reduced, which drops to 0.014 8 MPa. To further improve the overall safety performance of the offshore platform, the anti?explosion is designed, with the anti-explosion load of 0.015 MPa, which greatly reduced the impact of the explosion over-pressure on the surrounding oil and gas facilities.

Key words: offshore platform, oil?filled transformer, explosion, numerical simulation