| Brand | Switchgear parts |
| Model NO. | 126-252kV GIS Insulation torsion bar |
| Rated voltage | 126-252kV |
| Series | RN |
126-252kV GIS insulation torsion bar is the core transmission component in high-voltage gas insulated metal enclosed switchgear (GIS). Its technical characteristics and engineering application points are as follows:
1、 Core functions and performance requirements
Electrical insulation performance
To withstand 126-252kV power frequency voltage and lightning impulse voltage (such as 550kV/950kV), the surface electric field strength should be controlled below 15kV/mm, and the material dielectric strength should be ≥ 30kV/mm
The 252kV GIS insulation torsion bar needs to undergo vacuum pressure impregnation process (epoxy resin+polyester fiber) to ensure no threaded bonding and meet the requirements of fully enclosed composite electrical appliances
Mechanical performance
It needs to withstand the impact load of opening and closing (such as 40kA short-circuit current breaking), with a dynamic response frequency of 0-600Hz and a mechanical life of ≥ 10000 times
Aramid/polyester fiber composite material can enhance lightweight and fatigue resistance, suitable for high voltage levels of 252kV and above
2、 Innovation in Materials and Processes
Mainstream materials
Epoxy glass cloth tube: made by vacuum impregnation process, with high mechanical strength, suitable for 252kV GIS DS unit
Aramid fiber: Vacuum pressure impregnation molding process can prepare insulation rods with dense internal structure, possessing both mechanical and electrical properties
Process optimization
Adopting non threaded bonding technology to avoid stress concentration caused by threaded structures and improve reliability
The pressure resistant fixture design (such as shielding cover+positioning block) can achieve a one-time pressure resistance of 8 products, increasing efficiency by 200%
3、 Technical Challenges and Solutions
Dynamic fatigue failure
The impact of opening and closing can easily cause internal cracks, which need to be verified through 100 full capacity short-circuit current tests
Environmental adaptability
126kV fluorine free environmentally friendly GIS (such as CO ₂ insulation equipment) requires insulation torsion bars to withstand low temperatures (-40 ℃) and adapt to the characteristics of new media
4、 Industry Applications and Standards
Typical scenarios: 252kV GIS is used for ultra-high voltage transmission projects, and 126kV GIS is suitable for new energy generation projects
Specification basis: Complies with GB/T 11022-2020 and IEC 60694 standards
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