Transformer Tap Changer Support Structure Against Pendular Movement
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Solution Overview
Problem
In-tank tap changers in transformers face fatigue due to repetitive alternating accelerations, especially in the horizontal plane, which existing fixation methods are unable to effectively handle, leading to potential failure and oil leakage.
Innovation Solution
A transformer arrangement with a support structure extending between the tap changer and support members attached to the transformer tank's inner surface, reducing pendular movement and providing additional stability against horizontal accelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tap changer is fixated only towards the transformer tank cover, then the device complexity is reduced, but the reliability deteriorates under repetitive alternating accelerations
Solution Approach 1:
The fixation system is divided into two independent parts: the original fixation to the transformer tank cover and a new support structure fixing the tap changer to the transformer tank body. This segmentation allows each part to perform its specific function - the cover fixation maintains electrical connection while the tank body support structure resists pendular movement during acceleration, thereby improving reliability without significantly increasing overall complexity
Solution Approach 2:
The support structure extends vertically between the tap changer and the transformer tank body, adding a new spatial dimension to the fixation system. This vertical support member creates a second fixation path that is independent of the horizontal cover fixation, providing dimensional redundancy that enhances reliability under alternating accelerations while maintaining reasonable structural complexity
2Reliability
If additional support structure is added to reduce pendular movement, then the reliability improves, but the device complexity increases
Solution Approach 1:
A support structure with support members acts as an intermediary element between the tap changer and the transformer tank body. These support members serve as mediators that transfer and distribute the forces generated during alternating accelerations, reducing the direct stress on the primary fixation points and thereby improving reliability with a relatively simple added structure
Solution Approach 2:
The support structure is designed with support members positioned at specific locations between the tap changer and the transformer tank body, providing localized reinforcement where it is most needed to resist pendular movement. This targeted approach improves reliability at critical points without requiring a complete restructuring of the entire device, thus limiting the increase in overall complexity
Data Source
AI summary
A transformer arrangement includes a transformer, a transformer tank and at least one tap changer that is arranged to be connected to said transformer. The transformer arrangement further includes at least one support structure which is arranged to be connected to the tap changer and to extend between the tap changer and at least two support members located between the tap changer and at least two points on an inner surface of the transformer tank. The at least one support structure is arranged to reduce pendular movement of the tap changer.