Diverter Switch Cam Strength for On-Load Tap Changer
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Solution Overview
Problem
On-load tap-changers face challenges in withstanding high mechanical loads at higher currents and voltages, with existing mechanisms risking cam breakage due to the high forces required to open vacuum interrupters.
Innovation Solution
The diverter switch incorporates a cam made of a harder material, such as steel or heat-treatable steel, with a base body constructed from insulating materials like plastic or glass fiber reinforced plastic, ensuring the cam has higher strength than the base body to withstand mechanical loads while maintaining insulation spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cam is made from the same material as the base body (insulating material), then the base body maintains good insulation properties, but the cam breaks under high mechanical loads at higher currents and voltages
Solution Approach 1:
The cam is constructed from a different material than the base body. Specifically, the cam is made from metal (such as steel or heat-treatable steel) while the base body remains an insulating material. This composite material approach allows the cam to withstand high mechanical loads while the base body maintains insulation properties.
Solution Approach 2:
Different parts of the actuating body have different material properties optimized for their specific functions. The cam portion requires high strength and is made from metal, while the base body requires insulation and is made from insulating material. This local differentiation of material quality resolves the contradiction between strength and insulation requirements.
2Strength
If the cam is made from harder material (metal), then the cam withstands high mechanical loads, but the manufacturing complexity increases due to material joining requirements
Solution Approach 1:
The actuating body is manufactured as a composite structure combining metal cam and insulating base body. The patent specifies that the cam and base body are joined together, forming an integrated component that leverages the strengths of both materials while managing the manufacturing complexity through established joining techniques.
3Reliability
If the entire actuating body is made from insulating material, then insulation spacings are maintained, but the mechanism cannot withstand high forces required to open vacuum interrupters at higher currents and voltages
Solution Approach 1:
The actuating body uses a composite construction where only the cam portion is made from metal while the base body remains insulating. This targeted use of metal material provides the necessary strength for withstanding high forces during vacuum interrupter operation, while maintaining insulation properties where needed, thus balancing reliability requirements with structural complexity.
Data Source
AI summary
A diverter switch is for an on-load tap-changer. The diverter switch includes: at least one vacuum interrupter; an actuating element, which is mechanically connected at a first end of the vacuum interrupter and has a roller at a second end; and an actuating body having a base body and having at least one cam. The vacuum interrupter is configured to be actuated via the actuating element as a result of the roller moving over the actuating body. At least one part of the cam has a higher strength than the base body.