Abstract
Optimization for Grading Rings of High-Speed Train Roof Post Insulator
Highlights
By December 2020, the overall mileage of high-speed railway networks in China reached 38,000 km
For analysis of the maximum variation in strength of electric field for the post insulator, the electrostatic field can be replaced by the transient electric field to facilitate calculation
After the installation of grading ring, what increases is limited to the strength of electric field at the interface between the grading ring edge and air, while there is a significant reduction in the extent to which electric field is unevenly distributed on the surface of 1st sheath
Summary
By December 2020, the overall mileage of high-speed railway networks in China reached 38,000 km. In literature [13,14,15,16] an analysis was carried out regarding the impact of shielding cover on the flashover characteristics of insulator of roof high voltage isolator, which led to a conclusion that the installation of shielding cover and shielding bolt can contribute to improving the distribution of local electric field and slowing down the aging of bolt thread end on the lower sheath material. A 3D model including pantograph frame was constructed to simulate the impact of structural parameters of shielding device on the distribution of intensity for local electric field with lightning impulse voltage excitation. The selection of voltage equalizing grading ring parameters appropriate for real-world operation was proposed
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