Optimization Method of Dissolved Gas Detection Structure in Electric Power Equipment Oil Based on Particle Swarm Intelligence Algorithm

The output device of the converter transformer is the connection structure between the high-voltage output line of the converter transformer and the current carrying terminal board in the high-voltage bushing oil. It plays an important role in ensuring the insulation performance of the converter transformer and bushing. The structure of the output device of the converter transformer is complex, with a composite insulation structure composed of liquid and solid, various irregular interfaces, and the effects of the DC voltage, AC voltage, and polarity reversal voltage. Therefore, the E-field distribution of the±800kV ultra-high voltage converter transformer output device is very complex. Therefore, the fiber optic sensing technology can be used to monitor the transformer oil near the outlet device. To ensure the normal operation of the fiber optic sensor, the optimized design field strength value of the outlet device is set to 26.1kV/mm. Based on simulation calculation results, multi-objective optimization method and particle swarm optimization algorithm are applied to optimize the design of the outlet device. Finally, the reasonable and feasible insulation structure design scheme for ±800kV ultra-high voltage converter transformer outlet device is proposed, which is structurally reasonable and engineering feasible.