Planetary Gear Selector for Compact On-Load Tap Changers
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Solution Overview
Problem
Existing on-load tap-changers for tap-changing transformers face challenges in achieving uninterrupted diverter switch operation between different winding taps, often resulting in complex and bulky designs.
Innovation Solution
The implementation of a compact on-load tap-changer design that incorporates a planetary gear system within the selector, eliminating the need for separate selector arms and reducing the overall size of the tap-changer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional selector with separate selector arms and Geneva drive is used, then the tap-changer can operate between different winding taps, but the overall size and structural complexity increase
Solution Approach 1:
The patent combines the selector arm function and ring gear function into a single integrated component. The ring gear serves dual purposes: as a transmission element in the planetary gear system and as the selector arm that contacts the fixed contacts. This eliminates the need for separate selector arms and simplifies the Geneva drive mechanism, directly resolving the technical contradiction by reducing structural complexity while maintaining operational capability.
Solution Approach 2:
The ring gear is designed to perform multiple functions simultaneously: it acts as a gear element for motion transmission in the planetary gear system, serves as a selector arm for contacting fixed contacts, and provides structural support for the selector assembly. This multi-functionality reduces the total number of components needed and simplifies the overall selector structure while preserving the ability to operate the diverter switch between different winding taps.
2Ease of operation
If separate selector arms are used in the selector, then the diverter switch can be operated, but the overall size of the tap-changer increases
Solution Approach 1:
The patent merges the selector arm and ring gear into a single component, eliminating the need for separate selector arms. This integration reduces the number of parts and the space required for the selector assembly, directly addressing the volume reduction goal while maintaining the operational functionality of the diverter switch.
Solution Approach 2:
The selector assembly is designed with a compact nested structure where the ring gear is positioned within the planetary gear system. The fixed contacts are arranged in a circular pattern that allows the ring gear to access them while remaining integrated within the compact selector housing. This nesting arrangement minimizes the overall volume of the tap-changer while preserving operational capability.
3Volume of moving object
If a compact design is implemented, then space efficiency improves, but the structural complexity may increase
Solution Approach 1:
The patent applies merging by integrating the ring gear and selector arm into a single component, which reduces the number of parts and simplifies the overall structure. This integration achieves compactness without introducing additional complexity, as the combined component performs multiple functions that would otherwise require separate elements.
Solution Approach 2:
The ring gear is designed as a multi-functional element that simultaneously serves as a gear for motion transmission and as a selector arm for contacting fixed contacts. This universality allows the compact design to achieve space efficiency while avoiding structural complexity, as a single component fulfills multiple roles that would otherwise require additional parts.
Data Source
AI summary
An on-load tap-changer is for uninterrupted diverter switch operation between different winding taps of a tap-changing transformer. The on-load tap-changer includes: a diverter switch; and a selector. The selector has a contact carrier with a plurality of fixed contacts. The selector also has a planetary gear with a first ring gear, a first planetary gear, and a first sun gear. The first ring gear includes a first selector contact configured for contacting the fixed contacts.