Modular On-Load Tap-Changer for Compact Reliable Tap Switching
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Solution Overview
Problem
Existing on-load tap-changers have a complex and space-consuming structure, which is expensive and requires significant modifications for switching between winding taps.
Innovation Solution
A modular on-load tap-changer design with a main and auxiliary path, allowing modules to be configured as transition resistors, reactors, or bridges, enabling flexible switching principles without altering the basic structure, and enabling quick activation times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional diverter switch with vacuum interrupters and transition resistors is used, then reliable switching between winding taps is achieved, but the device becomes complex and space-consuming
Solution Approach 1:
The patent combines the diverter switch and selector into a single integrated module, eliminating the need for separate vacuum interrupters and transition resistors. The moving contact serves dual functions as both diverter switch contact and selector contact, significantly reducing structural complexity while maintaining switching reliability through the inherent design of the integrated module.
2Ease of operation
If a traditional cylindrical vessel with multiplicity of bars and selector arms is used, then winding tap switching is achieved, but the device requires a lot of space
Solution Approach 1:
The patent segments the traditional complex structure into a compact integrated module where the moving contact can selectively engage with stationary contacts on different bars. This segmentation allows the switching function to be achieved in a compact arrangement, reducing the device footprint from a large cylindrical vessel to a concentrated modular unit.
Solution Approach 2:
The patent transitions from a two-dimensional arrangement of selector arms on a plane to a three-dimensional configuration where the moving contact can access stationary contacts at different levels and positions. This dimensional change enables compact space utilization while maintaining full tap switching capability.
3Reliability
If a gear mechanism connecting diverter switch and selector is used, then coordinated switching is achieved, but the device becomes expensive and complex
Solution Approach 1:
The patent merges the diverter switch and selector operations into a single integrated module, eliminating the need for a separate gear mechanism to coordinate their movements. The moving contact's motion inherently coordinates both switching functions, reducing mechanical complexity while maintaining reliable coordinated operation through the integrated design.
4Adaptability or versatility
If a modular design with main and auxiliary paths is used, then versatility and compactness are improved, but the switching principle becomes more complex to implement
Solution Approach 1:
The patent implements a universal integrated module design that can operate with different switching principles (resistor-type high-speed switching or reactor-type switching) by simply changing the configuration of the main and auxiliary paths. The moving contact and stationary contacts are designed to accommodate multiple switching modes, providing versatility without requiring separate complex mechanisms for each principle.
Data Source
AI summary
An on-load tap-changer includes: a main path with a first connection; and an auxiliary path with a second connection. One module is configured be connected to each of the first and second connections.