Voltage Measuring Device Insulation Delamination Prevention
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Solution Overview
Problem
Conventional voltage measurement devices in medium or high voltage equipment face issues with delamination of semi-conductive or conductive layers from insulation materials, leading to increased partial discharges and reduced device lifespan.
Innovation Solution
A voltage measuring device with an internal electrode cast into the insulation material and electrically connected to an outer conductive or semi-conductive layer, featuring a radius shape to prevent delamination and enhance electric field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional metal box or conductive surface is used to prevent electrical shock hazard, then safety is improved, but production complexity and cost increase
Solution Approach 1:
The patent combines the safety function (conductive surface) with the insulation structure by integrating the conductive layer directly onto the insulation material surface, eliminating the need for separate metal boxes or additional conductive components. This merging reduces production complexity while maintaining electrical shock prevention.
Solution Approach 2:
The insulation material serves multiple functions: electrical insulation, mechanical protection, and when coated with conductive layer, also provides electrical shock protection. This multi-functionality eliminates the need for separate safety components, reducing overall device complexity.
2Reliability
If conductive particles are applied to create a conductive surface, then electrical shock prevention is improved, but production investment increases
Solution Approach 1:
The patent applies conductive particles only to the outer surface of the insulation material where electrical shock contact occurs, rather than throughout the entire structure. This asymmetric application reduces material costs and production investment while maintaining safety effectiveness.
Solution Approach 2:
The conductive particle coating uses relatively inexpensive materials applied in a simple manner, representing a cost-effective approach to safety compared to expensive metal boxes or complex conductive structures. The coating can be applied as a thin, economical layer.
3Reliability
If a semiconductive or conductive box/layer is used for safety, then electrical shock protection is improved, but delamination risk increases leading to reduced device lifespan
Solution Approach 1:
The conductive layer is applied to the insulation material surface before final assembly and testing, allowing proper adhesion bonding to occur under controlled conditions. This preliminary application prevents later delamination that would occur if the layer were added after assembly.
Solution Approach 2:
The patent specifies particular parameters for the conductive layer including thickness (0.05-2 mm), material composition, and adhesion properties. By controlling these parameters, the layer maintains electrical shock protection while preventing delamination through proper material selection and application conditions.
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 partial discharges and improves electric field distribution within the device, extending its lifespan and ensuring safe operation in medium or high voltage applications.
Implementation Method 1
The internal electrode is shaped into a radius which provides a homogeneous distribution of the electric field inside of the device
Implementation Method 2
the surface of conventional voltage transformers used for voltage measurement or protection purposes is usually coated by the conductive or semi-conductive layer, which is grounded
Data Source
Figure 1
Figure 2
AI summary
Voltage measuring device for high or medium voltage use, with a voltage divider, moulded into an insulating body, wherein the voltage measuring device contains an internal electrode (3), which is cast into the insulation material (8) under an outer conductive or semiconductive layer (4), and that the internal electrode (3) is electrically connected with the outer conductive or semi-conductive layer or housing (4).