Sealing Mortar for High-Voltage Insulators
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Solution Overview
Problem
Existing methods for manufacturing high voltage electrical insulators face a trade-off between mechanical resistance and workability of sealing mortars, with high mechanical resistance mortars being difficult to apply and low mechanical resistance mortars being unsuitable for high voltage applications, and current solutions do not effectively balance these properties.
Innovation Solution
A method using a dry mix of aluminous cement, sand, and a polymeric superplasticizer based on polyglycolmethacrylic acid ester, which is mixed with water to create a thixotropic sealing mortar that liquefies under stress, allowing for better workability and distribution, and is hardened with vibrations for a short duration to achieve high mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If excess water is added to the mortar to improve workability, then the mortar becomes easier to apply, but the mechanical resistance decreases due to increased porosity
Solution Approach 1:
The invention changes the chemical composition parameters of the mortar by adding a superplasticizer (polymer-based adjuvant) to the cement-water-sand mixture. This chemical parameter change allows the mortar to maintain high workability at lower water-to-cement ratios, thereby resolving the contradiction between ease of application and mechanical strength. The superplasticizer modifies the rheological properties of the mortar, enabling it to flow easily without requiring excess water that would create porosity.
Solution Approach 2:
The superplasticizer acts as an intermediary substance between water and cement. It mediates the interaction by adsorbing onto cement particles and creating a lubricating effect that improves workability without requiring additional water. This intermediary compound allows the mortar to achieve good spreadability and penetration while maintaining low water content, thus preventing porosity formation and preserving mechanical resistance.
2Strength
If a low water/cement ratio is used to increase mechanical resistance, then the mortar becomes stronger, but the workability decreases making it difficult to apply
Solution Approach 1:
The invention modifies the chemical composition by introducing a superplasticizer that changes the rheological parameters of the mortar. This allows the mortar to maintain high flowability and workability even at low water-to-cement ratios (below 0.4). The polymer adjuvant alters the molecular structure and interaction between cement particles, enabling the mortar to remain workable despite reduced water content, thus resolving the contradiction between strength and ease of application.
Solution Approach 2:
The invention creates a composite mortar system combining cement, sand, water, and a polymer-based superplasticizer. This composite material leverages the properties of each component: cement provides structural strength, sand provides bulk and stability, water provides workability, and the polymer superplasticizer enhances workability while allowing reduced water content. The synergistic interaction of these components resolves the contradiction by enabling both high strength and good workability simultaneously.
3Manufacturing precision
If vibrations are applied for a long duration to ensure homogeneous distribution of low-workability mortar, then the distribution improves, but the production rate decreases
Solution Approach 1:
The invention changes the rheological parameters of the mortar by adding a superplasticizer, which fundamentally alters how the mortar responds to vibration. The modified mortar requires significantly shorter vibration durations (5-15 seconds compared to 30-60 seconds) to achieve homogeneous distribution. The superplasticizer reduces internal friction and improves flow characteristics, allowing rapid consolidation and elimination of air bubbles with brief vibration, thus resolving the contradiction between distribution quality and production speed.
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 method results in a sealing mortar with improved mechanical strength, reduced porosity, and increased production rate, while maintaining good workability, and significantly enhances the mechanical strength by 20-25% compared to conventional mortars.
Implementation Method 1
A method using a dry mix of aluminous cement, sand, and a polymeric superplasticizer based on polyglycolmethacrylic acid ester, which is mixed with water to create a thixotropic sealing mortar that liquefies under stress
Implementation Method 2
vibrating said assembled dielectric and metallic insulator elements to distribute said sealing mortar between said dielectric insulator element and said metallic insulator element
Data Source
AI summary
The invention relates to a method for producing a high-voltage electrical insulator (1) including at least one metal insulator element (4, 6) embedded onto a dielectric insulator element (2) via a sealing mortar (5), including at least the following steps: preparing the mortar (5) from aluminous cement and sand mixed at least with water; assembling the dielectric element (2) and metal element (4,6) together, the mortar (5) being placed between the dielectric element (2) and the metal element (4, 6); and vibrating the dielectric element (2) and metal element (4, 6) assembled together so as to distribute the mortar (5) between the dielectric element and the metal element (2, 4, 6). In order to prepare the mortar (5), an active ingredient, which is a polymeric polyglycolmethacrylic acid ester superplasticizer, is added, and the vibration is carried out for a duration of 2 to 20 seconds, preferably 4 to 15 seconds.