126kV/800kV drum platform components

126kV/800kV cylindrical platform components are key structural parts in high-voltage power equipment, and their design needs to meet insulation, mechanical, and environmental adaptability requirements under high voltage levels. The following is a comprehensive technical analysis:
1、 Design Features and Material Selection
Voltage level difference
126kV cylinder platform components are usually made of epoxy resin composite materials, with a dielectric strength of ≥ 30kV/mm and a local discharge capacity of ≤ 5pC
800kV cylinder platform components require the use of high dielectric constant materials (such as alumina filled epoxy resin) with a dielectric strength of ≥ 50kV/mm, and are insulated with SF6 gas
Structural optimization
The 800kV cylindrical platform needs to adopt a multi-layer composite structure, such as a "metal insulation metal" sandwich design, to suppress electric field distortion
The 126kV cylindrical platform can adopt a single-layer insulation structure, but it is necessary to ensure that the creepage distance is ≥ 3.2mm (pollution level 2)
2、 Performance parameters and validation
Electrical performance
126kV parts have a power frequency withstand voltage of 230kV and a lightning impulse withstand voltage of 550kV; 800kV parts have a power frequency withstand voltage of 800kV and a lightning impulse withstand voltage of 1200kV
The 800kV drum platform needs to pass a 1200V DC/1-minute withstand voltage test with a leakage current of<1mA
Mechanical performance
The maximum deformation of the 126kV drum platform is ≤ 0.45mm, and the interface stress is below 70MPa; The 800kV cylinder platform needs to pass a water pressure test at 1.5 times the rated pressure
3、 Typical Applications and Standards
Application scenarios
126kV tube platform is used for urban substations and industrial power supply systems (such as automobile manufacturing plants)
800kV tube platform is used for ultra-high voltage transmission projects (such as ± 800kV DC lines)
Standard specifications
The design must comply with GB/T 11022-2020 "Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards"
800kV components must meet the aging testing requirements for insulation materials in DL/T 246-2006 "Guidelines for Chemical Supervision"
4、 Manufacturing and Testing
Process requirements
The 126kV cylinder platform can use vacuum casting technology, while the 800kV cylinder platform requires 3D printing and gradient material composite technology
800kV parts require X-ray inspection for laminated defects
Environmental friendliness
800kV cylinder platform needs to reduce SF6 gas consumption by 15%, in line with the environmental protection requirements of the "Guiding Catalogue for the First Batch of Application Demonstrations of Key New Materials"

Note: Customization with drawings is available