Conductor Assembly Insulating Spacer for Capacitive Voltage Sensor
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Solution Overview
Problem
Existing capacitive voltage sensors on power cables face long-term stability issues due to incompatibility between insulating and sensing electrode materials, leading to degradation and reduced measurement precision over time, making recalibration difficult and costly.
Innovation Solution
Incorporating an electrically insulating spacer element between the insulating layer and the sensing electrode allows for the use of non-compatible materials, enhancing the stability and accuracy of the sensing capacitor by maintaining the desired capacitance and reducing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensing electrode is placed directly on the insulating layer, then the sensor structure is simple, but the materials of the insulating layer and sensing electrode are incompatible leading to long-term degradation
Solution Approach 1:
The patent introduces a spacer element as an intermediary component between the insulating layer and the sensing electrode. This spacer element acts as a mediator that prevents direct contact between incompatible materials, thereby eliminating degradation pathways while maintaining structural simplicity. The spacer element is electrically insulating and mechanically stable, serving as a buffer that allows incompatible materials to coexist without interacting.
2Reliability
If compatible materials are used for the insulating layer and sensing electrode, then long-term stability is improved, but material selection and manufacturing become more restricted
Solution Approach 1:
The spacer element serves as a universal intermediary that decouples the material selection constraints between the insulating layer and sensing electrode. By introducing this intermediate layer, the patent allows any combination of insulating layer materials and sensing electrode materials to be used together, as long as both are compatible with the spacer element material. This dramatically expands material versatility while ensuring long-term stability.
3Ease of manufacture
If the sensing electrode is rigid and placed on a structured insulating layer surface, then manufacturing is easier, but air pockets form and grow with temperature changes causing electrode damage
Solution Approach 1:
The spacer element acts as a compliant intermediary layer between the rigid sensing electrode and the structured insulating layer surface. This intermediate layer can deform elastically with temperature changes, accommodating surface irregularities and preventing air pocket formation. The spacer absorbs thermal expansion and contraction stresses, protecting the rigid electrode from damage while maintaining easy manufacturability.
4Ease of operation
If adhesive is used to affix the sensing electrode to the insulating layer, then installation is simplified, but adhesive degradation and migration occur over time affecting measurement precision
Solution Approach 1:
The spacer element replaces the adhesive layer entirely, serving as a permanent mechanical and electrical intermediary. Instead of using degradable adhesive to affix the sensing electrode, the spacer element provides stable mechanical support and electrical insulation through its structural design. This eliminates adhesive migration and degradation issues while maintaining easy installation through simple placement of the spacer and electrode 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
This configuration improves the long-term accuracy of voltage sensors, potentially making recalibration obsolete and reducing the risk of electrical partial discharges, while maintaining the desired voltage signal range.
Implementation Method 1
an electrically insulating spacer element, arranged radially between the insulating layer and the sensing electrode
Implementation Method 2
a sensing electrode, arranged radially outward of the insulating layer, and operable as a first electrode of a sensing capacitor of a capacitive voltage sensor, in which sensing capacitor the inner conductor is operable as a second electrode
Data Source
AI summary
A conductor assembly for a power network includes an inner conductor defining radial and axial directions, an insulating layer arranged around at least an axial section of the inner conductor, and a sensing electrode arranged radially outward of the insulating layer. The sensing electrode is operable as a first electrode of a sensing capacitor of a capacitive voltage sensor, in which sensing capacitor the inner conductor is operable as a second electrode. The conductor assembly further includes an electrically insulating spacer element arranged radially between the insulating layer and the sensing electrode.