High Voltage Current Converter Outer Tube Insulation
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Solution Overview
Problem
Current transformers for high-voltage systems with multi-strand primary conductors require numerous seals for fluid or oil paper insulation, making it complex to adapt to changing current measurement ranges, as each strand needs separate sealing at entry and exit points, limiting scalability and increasing manufacturing effort.
Innovation Solution
The design incorporates an outer tube primary conductor that serves as both a power transmission conduit and a protective sheath for inner conductors, allowing for easy insertion or removal of inner conductors without additional sealing, reducing the number of seals needed and enabling easier retrofitting by using a single seal at the outer tube's entry and exit points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate primary conductor strands are used to expand current measurement range, then the current measurement range is expanded, but the number of seals required increases significantly
Solution Approach 1:
The patent combines multiple primary conductor strands into a single integrated primary conductor structure with longitudinal slots. This merging approach allows multiple conductors to pass through the measurement device simultaneously while requiring only two seals (at the ends of the single primary conductor) instead of multiple seals for separate conductors, thus resolving the contradiction between expanded measurement range and reduced sealing complexity.
Solution Approach 2:
The single primary conductor structure serves multiple functions: it provides multiple current-carrying paths for expanded measurement range, maintains structural integrity for simplified sealing, and enables both series and parallel connection configurations. This multi-functionality allows the same structure to achieve various measurement ranges without increasing seal complexity.
2Reliability
If multiple seals are installed for each strand to maintain insulation, then insulation reliability is improved, but manufacturing complexity and effort increase
Solution Approach 1:
The patent merges multiple sealing operations into a single sealing process by using one continuous primary conductor structure that requires seals only at its two ends. This reduces manufacturing complexity while maintaining insulation reliability through the integrated design, as the fluid insulation can continuously surround all conductor strands without requiring multiple discrete seal installations.
3Reliability
If separate sealing is performed for each strand, then insulation integrity is maintained, but adaptability to changed current measurement ranges is reduced
Solution Approach 1:
The patent creates a dynamic configuration where the number of conductor strands within the single primary conductor can be adjusted (by adding or removing strands from the longitudinal slots) while maintaining the same sealing structure. This dynamic adaptability allows the current measurement range to be changed without requiring additional seals or compromising insulation integrity, as the single sealed structure flexibly accommodates different strand configurations.
Data Source
AI summary
A current converter with fluid or oil paper insulation for high voltage, with a head housing through which a primary conductor passes. A measurement device through which the primary conductor passes is arranged in the head housing. The primary conductor includes two different primary conductor types, more specifically an outer tube primary conductor as the first type and one or more inner conductor primary conductors as the second type. The outer tube primary conductor surrounds an interior that is designed to receive the inner conductor primary conductor, and the inner conductor primary conductors can be inserted into the interior. The outer tube primary conductor is used to transmit power and creates an encasement for the inner conductors. Only the outer tube primary conductor needs to be sealed with respect to the head housing. Inner conductors therefore can be easily inserted or re-moved subsequently, without the need for sealing measures.