On-Load Tap Changer Selector With Common Insulating Plate
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Solution Overview
Problem
Existing on-load tap changers lack efficient surge voltage resistance and are cumbersome, leading to increased size and cost, while also being difficult to install and maintain.
Innovation Solution
A selector for an on-load tap changer with a diverter switch featuring an insulating plate with fixed and moving contacts that allow for simultaneous contact with multiple fixed contacts, reducing component count and size, and utilizing a Geneva wheel mechanism for precise contact switching, enabling high surge voltage resistance and easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional on-load tap changer design is used, then the device has basic switching functionality, but it lacks efficient surge voltage resistance and has increased size and cost
Solution Approach 1:
The patent combines the selector switch and diverter switch into a single integrated device. The selector switch for changing transformer taps and the diverter switch for load transfer share common components including the insulating plate, fixed contacts, and drive mechanism. This merging eliminates the need for separate switching devices, reducing overall size while maintaining surge voltage resistance through the unified design where all contacts are grounded to the common insulating plate.
Solution Approach 2:
The insulating plate serves multiple functions: it provides electrical insulation, acts as a common ground for all contacts to ensure surge voltage resistance, supports the fixed contacts, and provides mechanical structure for the entire switching device. This multi-functionality reduces the number of separate components needed, thereby reducing size and cost while maintaining reliability.
2Reliability
If a conventional on-load tap changer design is used, then the device has basic switching functionality, but it is cumbersome and leads to increased cost
Solution Approach 1:
The patent merges the selector switch and diverter switch into one integrated device, reducing component count. The common insulating plate serves as a unified structural and electrical foundation for both switching functions, eliminating the need for separate insulating structures and support components that would increase complexity and cost.
Solution Approach 2:
The common insulating plate performs multiple critical functions simultaneously: electrical insulation, surge protection through common grounding, mechanical support for all contacts, and structural framework. This multi-functionality reduces the number of separate components needed, simplifying the device while maintaining safety and reliability.
3Reliability
If a conventional on-load tap changer design is used, then the device has basic switching functionality, but it is difficult to install and maintain
Solution Approach 1:
The integrated switching device is designed as a modular unit that can be installed as a single assembly into the transformer. The common insulating plate with all fixed contacts pre-mounted creates a self-contained module that simplifies installation. The Geneva wheel mechanism with standardized drive shafts and cams provides repeatable, precise positioning that facilitates consistent installation and maintenance procedures.
Solution Approach 2:
By grounding all contacts to the common insulating plate, the patent creates an equipotential structure that eliminates voltage differences between different parts of the device. This design feature simplifies installation by reducing electrical hazards and makes maintenance safer, as all components are at the same potential reference point.
4Volume of stationary object
If fewer components are used to reduce size and cost, then the device becomes more compact and economical, but it may compromise safety and functionality
Solution Approach 1:
The common insulating plate is designed to perform multiple critical safety and functional roles simultaneously: providing electrical insulation to prevent short circuits, serving as a common ground for all contacts to ensure surge voltage resistance, supporting all fixed contacts mechanically, and providing the structural framework for the entire device. This multi-functionality allows the device to be compact and economical while maintaining safety, as one component replaces what would traditionally require multiple separate safety-critical components.
Data Source
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AI summary
Selector (10) for an on-load tap changer (15) having a load transfer switch (14), comprising - an insulating plate (11) with a first side (20) and a second, opposite side (30); - a plurality of fixed contacts (18) which extend from the first side (20), through the insulating plate (11), to the second side (30); - a first moving contact (21) on the first side (20); - a second moving contact (31) on the second side (30); - a first connection (27) which is connected to the first moving contact (21); - a second connection (37) which is connected to the second moving contact (31); wherein - each moving contact (21, 31) can be selectively connected to each of the fixed contacts (18).