The valve-side outlet device of the converter transformer is one of the key components of the converter transformer. The insulation structure design is the key technology for the design and manufacture of the outlet device. The insulation structure and electric field distribution of the outlet device have great influence on technical performance and safety. Based on the finite element method and ANSYS simulation software, under the AC and DC electric field distributions of the parts of the straight tube-shaped and allotype-shaped insulation structure were simulated, and the influence of the outlet device's operation characteristics and safety under AC and DC electric field was analyzed. The result shows that: 1 Under the AC voltage, the electric field distribution of the valve side outlet device depends on the relative permittivity of the material; the DC voltage depends on the resistivity of the material; 2 the insulation structure has a great influence on the electric field distribution of the outlet device.
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