Tubular Electric Field Sensor Assembly With External Field Shielding
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Solution Overview
Problem
Existing electrical sensor assemblies for transformers and similar structures fail to accurately detect the electric field generated by a connecting bar without interference from surrounding fields, are large and costly, lack accuracy in measurements, and suffer from partial discharging due to resin issues and temperature variations.
Innovation Solution
A sensor assembly featuring a tubular body with insulating material, a conductive inner layer for electric field detection, a conductive outer layer for shielding, and cantilevered tabs to house dielectric resin, which enhances immunity to external fields and maintains measurement accuracy across temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known sensor assemblies are used to detect electric field, then detection function is provided, but measurement accuracy deteriorates due to interference from surrounding electrical fields
Solution Approach 1:
The patent introduces an intermediary structure (tubular body with specific geometry and material properties) that mediates between the connecting bar and the sensor elements. This intermediary structure guides and concentrates the electric field lines, allowing the sensor to detect the field generated by the connecting bar while filtering out surrounding electrical field interference, thereby improving measurement accuracy.
Solution Approach 2:
The patent applies local quality by creating a specialized detection zone around the connecting bar using the tubular body structure. The structure is designed to concentrate and guide electric field lines locally in specific regions, enhancing the sensor's ability to detect the connecting bar's field while ignoring external interference from other conductors in the vicinity.
2Measurement precision
If known sensor assemblies are used, then electric field detection is enabled, but device size increases
Solution Approach 1:
The patent employs a nested structure where sensor elements are positioned inside the tubular body, which itself surrounds the connecting bar. This nested arrangement allows multiple functional components to be integrated in a compact configuration, achieving effective electric field detection without requiring excessive space, thus reducing overall device size while maintaining detection capability.
3Strength
If resin is used to bond components, then structural integrity is provided, but partial discharging occurs due to cavities and detachment
Solution Approach 1:
The patent modifies the physical and chemical parameters of the resin material and the bonding process to eliminate cavities and ensure complete adhesion. By changing parameters such as resin viscosity, curing temperature, and surface preparation, the patent achieves a void-free bonding structure that maintains both structural integrity and electrical reliability, preventing partial discharging even under temperature variations.
4Measurement precision
If complex sensor assembly structures are used, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the sensor assembly into modular segments including the tubular body, sensor elements, and bonding structures. This segmentation allows each component to be manufactured separately using optimized processes, then assembled efficiently. The modular approach maintains the complex geometry needed for accurate field detection while reducing overall manufacturing cost through standardized production methods and simplified assembly.
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 isolates the electric field detection from external interference, improves measurement accuracy, and reduces partial discharging, resulting in a more reliable and cost-effective sensor assembly.
Implementation Method 1
a first layer of electrically conductive material disposed on the inner surface of the support member, the electric field sensor configured to detect an electric field produced by the connecting bar
Implementation Method 2
a first electric screen comprising a second layer of electrically conductive material disposed on the outer surface of the support member, the first electric screen configured to shield the electric field sensor from outside electrical interference
Data Source
AI summary
A sensor assembly includes a connecting bar extending along a longitudinal axis and a tubular body extending along the longitudinal axis and at least partially surrounding the connecting bar such that the tubular body is radially spaced from the connecting bar. The tubular body includes a first skirt portion, a first plurality of cantilevered tabs extending from the first skirt portion in a first direction parallel to the longitudinal axis, a second skirt portion, and a second plurality of cantilevered tabs extending from the second skirt portion in a second direction opposite the first direction.