Transformer Tap Changer Switch Design Without Metallic Fasteners

The patent removes metallic screws from the switch assembly entirely. Instead of using metallic fasteners to attach contacts to the housing, the design relies on the housing structure itself to provide both mechanical support and electrical insulation, eliminating the conflicting element that provided mechanical strength but compromised dielectric performance.

The switch housing is designed as a composite structure combining non-conductive material for electrical insulation with embedded conductive elements or contact structures that provide both mechanical attachment and electrical connectivity without requiring separate metallic fasteners. This integrated approach resolves the contradiction between mechanical fastening and dielectric performance.

The patent applies electrical insulation properties locally at the switch housing and contact support structures rather than requiring increased overall clearance distances. By concentrating insulation where it is most needed (at the source of high voltage elements), the design achieves required electrical clearance without proportionally increasing the entire switch or tank size.

The design addresses electrical clearance requirements by utilizing the third dimension (vertical placement above the core clamp) rather than solely increasing horizontal clearance distances. This allows meeting minimum clearance requirements without proportionally increasing the overall switch footprint or tank volume.

The patent concentrates insulation and clearance provisions locally at the switch housing and contact areas rather than increasing the overall switch size. This localized approach reduces the amount of additional materials and space required, thereby lowering acquisition and maintenance costs while still meeting electrical clearance requirements.

The design employs cost-effective non-conductive materials and simplified switch construction that reduce manufacturing costs. By eliminating metallic screws and using integrated housing structures, the patent reduces both material costs and assembly complexity, leading to lower acquisition and maintenance expenses.