Transformer Tapping Arrangement Vacuum Chamber Design
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Solution Overview
Problem
Transformer tapping arrangements using On Load Tap Changers with insulation oil face issues of electrical arcing, contamination, and heat degradation, while vacuum interrupters increase complexity and volume, reducing reliability.
Innovation Solution
A tapping arrangement with a movable rotary contact and transition rotor arm in a vacuum chamber, utilizing a transition resistor for by-pass circuit and a motor-driven mechanism for efficient tap change-over, minimizing arcing and heat generation, and maintaining reliability with reduced size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum interrupters are used to reduce electrical arcing and contamination, then reliability improves, but device complexity and volume increase
Solution Approach 1:
The patent combines multiple vacuum interrupters into a single integrated vacuum chamber, merging the functions of multiple devices while maintaining their individual arc-quenching capabilities. This reduces the overall number of separate components and simplifies the mechanical operation mechanism while preserving reliability benefits
Solution Approach 2:
The patent segments the vacuum interrupter system into multiple independent contact pairs within a single vacuum chamber, allowing each contact pair to operate independently for tap changing operations. This segmentation enables reduced complexity in the overall mechanism while maintaining the reliability advantages of vacuum interruption
2Object-affected harmful factors
If multiple vacuum interrupters are used for each phase to minimize electrical arcs, then arc reduction improves, but volume increases
Solution Approach 1:
The patent merges multiple vacuum interrupter functions into a single shared vacuum chamber, eliminating the need for separate vacuum chambers for each interrupter. This significantly reduces the overall volume while maintaining the arc-minimizing benefits of vacuum interruption across all contact pairs
3Object-affected harmful factors
If insulation oil is used for insulation and cooling, then electrical insulation improves, but contamination from arcing occurs
Solution Approach 1:
The patent uses vacuum as an inert environment replacing insulation oil for the arc-quenching medium. The vacuum atmosphere provides excellent electrical insulation properties while being completely immune to arcing contamination, heat degradation, and other harmful effects that plague oil-based insulation systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces arcing and heat generation, improves reliability, and minimizes the volume of the transformer tapping arrangement, achieving efficient and stable voltage regulation with reduced operational complexity.
Implementation Method 1
the problems of insulation oil contamination have been addressed by use of a vacuum interrupter in which the electrical contacts of the transformer tapping or selector arrangement are located in a vacuum chamber to reduce and isolate the electrical arc during the tap or contact switch over and changing operation
Implementation Method 2
the transition rotor having transition rotor arm having two ends with transition contacts in a pair arranged to engage in turn as the rotor end rotates the original fixed contact, bridge the original fixed contact and the destination contact with a transition contact of the pair engaging each and then the destination fixed contact only during a tap change-over, the transition contacts connected through at least one transition resistor
Data Source
AI summary
A tapping arrangement for a transformer, the arrangement comprising a plurality of fixed contacts, a movable rotary contact, a transition rotor with pairs of transition contacts, an interrupter coupling assembly and driving motor(s) are compacted into a single vacuum chamber.