Based on the design of the ion cyclotron high-voltage power supply for the China Fusion Engineering Test Reactor (CFETR), an electric field analysis was conducted on the dry-type multi-winding transformer and power supply module to verify the insulation safety of the design and provide recommendations for potential weak points in the system. Firstly, a finite element analysis software was employed to perform steady-state electric field calculations for the dry-type transformer. The results confirmed the insulation safety of the transformer under normal operating conditions, while also revealing non-uniform electric field distribution around the spacer blocks, suggesting that their geometry should be optimized. Subsequently, an equivalent circuit method was used to analyze the transient response of the transformer under overvoltage impulse conditions,yielding the corresponding electric field distribution. The results showed that the maximum electric field intensity in the main air channel was relatively high; this could be mitigated by adjusting the dimensions of the transformer’s insulation structure. For the power supply module, the influence of parasitic capacitance was taken into account, and the electric field distribution around the mounting brackets was calculated and simulated. The simulation showed that the highest electric field occurred at the edges where the sharp corners of the power module meet the surrounding air, but this peak field strength remained below the dielectric breakdown strength of air.

Dry-type transformer, Power supply module, Electric field, Transient

基于中国聚变工程实验堆(CFETR)离子回旋高压电源设计，对干式多绕组变压器和电源模块进行电场分析，检验设计方案的绝缘安全性，并为装置薄弱环节提供建议。首先使用有限元计算软件对干式变压器进行稳态电场计算，结果证实了变压器正常运行时的绝缘安全，同时显示垫块部分场强分布不均，应对其形状进行优化。然后用等值电路法求解变压器在过电压冲击下的暂态过程，得出电场分布。结果显示，主空道最大场强偏高，可以通过调整变压器绝缘结构尺寸使场强降低。对于电源模块，考虑分布电容的作用，对安装支架的电场分布进行计算和仿真。结果显示，场强最大处位于电源模块棱边与空气相接的边缘，且未超过空气击穿场强。

干式变压器, 电源模块, 电场, 暂态