Tap Selector Change-Over Structure Using Arc Conductors
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Solution Overview
Problem
The existing combined-type on-load tap-changer selectors for hanged transformers face challenges in connecting leads due to electromagnetic forces, leading to complex manufacturing, increased space requirements, and higher transformer oil consumption, as well as potential accidents from lead position changes.
Innovation Solution
A change-over structure featuring an insulation changer base plate with evenly distributed moving contacts on a rotation shaft, connected to arc-shaped conductors that align with static contacts, allowing seamless electrical connections without the need for connection conductors, reducing complexity and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional concentrically rotating structure with leads is used in hanged combined-type on-load tap-changer, then the selector can be applied, but the leads need to be bent to various shapes requiring complex manufacturing and occupying large space
Solution Approach 1:
The patent removes the leads from the system entirely. Instead of using conventional leads that need to be bent and shaped to connect static contacts, the invention uses arc-shaped conductors that are integrated into the selector structure itself, eliminating the need for separate connection conductors and their complex manufacturing
Solution Approach 2:
The patent employs arc-shaped conductors with circular arcs that have the rotation shaft center as their center. This curved geometry allows the conductors to naturally follow the rotational motion and maintain proper electrical connections without requiring complex bending or shaping of straight leads
2Reliability
If conventional leads are used with interval ensured between them, then connection is achieved, but large space is occupied increasing changer oil chamber volume
Solution Approach 1:
The patent merges the functions of multiple leads into a single integrated arc-shaped conductor structure. The arc-shaped conductors are arranged compactly around the rotation shaft, allowing multiple electrical connections to be made in a smaller radial and axial space, thereby reducing the overall volume of the changer oil chamber
3Power
If conventional leads are used in high-voltage and large current environment, then electromagnetic force acts on leads, but leads positions are easily changed causing accidents
Solution Approach 1:
The patent pre-positions the arc-shaped conductors in fixed locations around the rotation shaft before operation. These conductors are rigidly mounted to the insulation plate or support structure, establishing stable electrical connections before the rotating assembly begins operation, thereby preventing any position changes during operation
Solution Approach 2:
The arc-shaped conductors with circular geometry naturally accommodate the rotational motion while maintaining constant radial positioning. The curved shape allows the conductors to follow the circular path of the rotating contacts without experiencing lateral forces that would cause position changes or disconnection
Data Source
AI summary
A change-over structure disposed between a moving contact and a static contact of a tap selector includes an insulation changer base plate, static contacts which are fixed on the insulation changer base plate in at least one column at intervals, the inner ends of the static contacts are electrically connected to respective tap windings of a transformer, rotation shafts, each comprising moving contacts that are evenly distributed on each of the rotation shafts and are electrically connected to each other, and arc-shaped conductors corresponding to the static contacts in at least one column. Each of the arc-shaped conductors and outer ends of the static contacts are disposed at the same circumference with a center of one of the rotation shafts as a circle center. When one of the moving contacts is changed over between the two static contacts, another moving contact is electrically connected to the arc-shaped conductor.