Three-position isolating switch
By optimizing the spatial layout and switching structure of the three-position disconnect switch, the problems of uneven electric field distribution and insufficient creepage distance under low-pressure N2/dry air were solved, achieving electric field uniformity and discharge prevention, meeting environmental protection requirements, and improving operational reliability and equipment lifespan.
Patent Information
- Application Number
- CN202521617077.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-24
- Estimated Expiration
- 2035-07-31
AI Technical Summary
When using low-pressure N2/dry air as the insulating medium, the existing three-position disconnecting switch has uneven electric field distribution and insufficient creepage distance, resulting in phase-to-phase and phase-to-ground discharge problems, which cannot meet environmental protection requirements.
By improving the spatial layout and switching structure of the three-position disconnect switch, the connecting contact, intermediate stationary contact and grounding contact are evenly distributed left and right. The electric field distribution is optimized and the creepage distance is increased through the left and right movement design of the moving contact. At the same time, the transmission screw and guide structure driven by magnetohydrodynamics are used to ensure the precise movement of the moving contact.
It achieves uniform electric field distribution under low-pressure N2/dry air, avoids discharge problems, meets creepage distance requirements, reduces greenhouse gas emissions, complies with environmental protection policies, and improves operational reliability and service life.