| Brand | Switchgear parts |
| Model NO. | 252kV Single-phase bowl insulator |
| Rated voltage | 252kV |
| Series | RN |
The single-phase bowl insulator (referred to as "single-phase bowl") used in 252kV GIS equipment is a key component of high-voltage gas insulated switchgear, and its design needs to take into account both insulation performance and mechanical strength. The following are comprehensive technical points and application analysis:
1、 Core design parameters
Voltage level
Suitable for 252kV system, power frequency withstand voltage 230kV (to ground/break), lightning impulse withstand voltage 550kV
Typical SF6 gas pressure is 0.4-0.6MPa, local discharge capacity ≤ 5pC
Structural optimization
Adopting a double-sided symmetrical curved design, the electric field strength is reduced by more than 25% compared to a unidirectional convex design, and the deformation is reduced by 30%
Aluminum free ring structure reduces SF6 gas consumption by 15% while avoiding local electric field distortion
2、 Performance verification and fault analysis
Experimental verification
Verify the design margin through insulation testing and water pressure failure testing (1.5 times rated pressure) at Kunming Ultra High Voltage Test Base
In the 252kV GIS fault statistics, discharge faults caused by foreign objects account for 29%, with the highest risk of breakdown occurring when metal shavings are arranged in sheet form in the low potential area
Foreign object influence
Metal shavings adhering to high potential areas do not cause breakdown, but the sheet-like arrangement in low potential areas can easily lead to discharge; The partial discharge of non-metallic foreign objects (such as sand particles) is significantly higher than that of other types
3、 Typical application scenarios
Urban power grid: 252kV GIS is widely used for busbar connection in 220kV substations, such as the Xinjiang Tianfu Energy Xuhui 220kV transmission and transformation project
Industrial power supply: equipped with 252kV/4000A-50kA combination electrical appliances (HGIS) to meet high current requirements
Note: Customization with drawings is available
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